Keithley 705 User manual

InstructionManual
Model 705 Scanner
Contains OperatingandServicing Information
705-001-01 Rev. F/ 4-00

WARRANTY
Keithley Instruments, Inc. warrants this product to be free frqm defects in material and workmanship for a period of I year
from date of shipment.
Keithley Instruments, Inc. warrants the following items for 90 days from the date of shipment: probes, cables, rechargeable
batteries, diskettes, and documentation.
During the warranty period, we will, at our option, either repair or replace any product that proves to be defective.
To exercise this warranty, write or call your local Keithley representative, or contact Keithley headquarters in Cleveland, Ohio.
You will be given prompt assistance and return instructions. Send the product, transportation prepaid, to the indicated service
facility. Repairs will be made and the product returned, transportation prepaid. Repaired or replaced products are warranted for
the balance of the original warranty period, or at least 90 days.
LIMITATION OF WARRANTY
This warranty does not apply to defects resulting from product modification without Keithley’s express written consent, or
misuse of any product or part. This warranty also does not apply to fuses, software, non-rechargeable batteries, damage from
battery leakage, or problems arising from normal wear or failure to follow instructions.
THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIE S, EXPRESSED OR IMPLIED, INCLUDING ANY
IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. THE REMEDIES PRO-
VIDED HEREIN ARE BUYER’S SOLE AND EXCLUSIVE REMEDIES.
NEITHER KEITHLEY LNSTRUMENTS, INC. NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT,
INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS
INSTRUMENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUMENTS, INC.. HAS BEEN ADVISED IN ADVANCE
OF THE POSSIBILITY OF SUCH DAMAGES. SUCH EXCLUDED DAMAGES SHALL INCLUDE, BUT ARE NOT LIM-
ITED TO: COSTS OF REMOVAL AND INSTALLATION, LOSSES SUSTAINED AS THE RESULT OF INJURY TO ANY
PERSO.N, OR DAMAGE TO PROPERTY.
Keithley Instruments, Inc. l 28775 Aurora Road l Cleveland, OH 44139 l m-248-0400 l Fax: [phone] l http://www.keithley.com
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Model705 Scanner
InstructionManual
01982, Keithley Instruments, Inc.
All rights reserved.
Cleveland, Ohio, U.S.A.
Sixth Printing, April 2000
Document Number: 705-901-01 Rev. F

SPECIFICATIONS
CAPACITY: Two plug-in cards per mainframe.
EXPANSION CAPACITY: Daisy chain allows up to 4 SLAVE units with 1
MASTER unit.
SWITCHING RATE: 100 channels/second IlOms), programmable to 1
channel/l6 minutes 1999.999s).
RELAY DRIVE: 350mA minimum.
INTERNAL CLOCK: Displays hours/minutes/seconds or date/month; less
than 1 minute/month error (typical).
BATTERY BACKUP: Rechargeable 3.6V nickel-cadmium. 1 month reten-
tion of data (typical) with unit turned off.
IEEE-488 BUS IMPLEMENTATION
Multiline Commands: DCL, LLO, SDC, GET, GTL, UNT, UNL, SPE, SPD.
Uniline Commands: IFC, REN, EOI, SRQ, ATN.
Interface Functions: SHl, AHl, T6, TEO, L4, LEO, SRI, RLI, PPO, DCl,
DTI, CO, El.
Programmable Parameters: Display Mode, Output Format, EOI, SRQ,
First, Last, Open, Close, Display Channel, Alternate Output, Pole Mode,
Date Format, Save/Restore, Reset, l/O Port, Time, Date, Settling Time,
Interval Time, Alarm Time, Program Mode, Trigger Mode, Terminator, Self
Test.
Digital I/O Port: A separate I/O port consisting of eight input and eight out-
put lines as well as common (IEEE-488) and +SVDC. Outputs will drive
one TTL load. Inputs represent one TTL load. Mating connector supplied.
FRONT PANEL PROGRAMS
0 - Digital I/O
I* - Date Format
2’ -Settle Time
3” - IEEE Address
4* -Save Setup
5* - Restore Setup
6* - Poles
7 -Alarm Time
8 - Self Test
%I* - Stand Alone
91’ - Master
92’ - Slave
99 -Reset
*Battery backed up.
Read or change state on digital I/O port.
Changes date display between MM.DD and
DD.MM.
Time to output CHANNEL READY pulse after
closing relay.
Set bus address; cannot be programmed from bus.
Stores present relay setup in numbered (I - 5)
buffer.
Recalls relay setup in buffer 1 - 5.
1, 2 or 4-pole configuration for switching.
Set time for Alarm output pulse; repeats daily.
Check RAM, ROM, LEDs.
Single 705 configuration.
Daisy chain configuration.
Daisy chain configuration.
Reset battery backup parameters to factory values.
STORAGE ENVIRONMENT: -25O to 65°C.
CONNECTORS: Four BNC; External Trigger, Alarm Out/Serial-In, Channel
Ready, Serial Out (TTL compatible).
POWER: 105-125V or 210-250V (internal switch selected), 5OHzto4OOHz.25
V*A maximum. 90-IIOV and 180.220V version available.
DIMENSIONS, WEIGHT: 127mm high x 216mm wide x 359mm deep (5”
x 8%” x 14%“). Net weight 3kg (6% lbs.).
ACCESSORIES AVAILABLE:
Model 1019A: 5%” Universal Fixed Rack Mounting Kit
Model 1019s: 5%” Universal Slide Rack Mounting Kit
Model 4801: BNC-to-BNC Cable
Model 7008-3: IEEE-488 Cable, 0.9m I3 ft.)
Model 7008-6: IEEE-488 Cable, 1.8m (6 ft.)
Model 7010: IEEE-488 Adapter for Model 85 Computer
Model 7024-3: Triaxial Cable, 0.9m (3 ft.)
Model 7024-10:Triaxial Cable, 3.0m (IO ft.)
Model 7055: Quick Disconnect Card
Model 7056: General Purpose Scanner Card
Model 7057: Thermocouple Scanner Card
Model 7058: Low Current Scanner Card
Model 7059: Low Voltage Scanner Card
Specificationssubjectto changewithout notice.
GENERAL
DISPLAY: Six 0.5” LED digits with decimal point, function and IEEE status
annunciators.
OPERATING ENVIRONMENT: O” to 50°C, 0% to 80% relative humidity
up to 35oc.
SPECIFICATION ADDENDUM
1. Batten/ back-up time is for unit at 23OC. Operation or storage at higher
temperatures could reduce this time below 1 month. Even under extremes
a fully charged system should last a week.
2. Note that some plug-in card specifications may limit mainframe perfor-
mance when installed (e.g. Humidity).
3. Relay drive capability at 400Hz is limited to 200mA typical and a max-
imum ambient temperature of 35OC.

1
2
Tableof Contents
General Information
Introduction. ........................................................................................................................................................ l-l
Features................................................................................................................................................................ 1-l
Warranty Information .......................................................................................................................................... 1-l
Manual Addenda ................................................................................................................................................. l-1
Safety Symbols and Tenns.. ................................................................................................................................ l-1
Unpacking and Inspection ................................................................................................................................... l-l
Specifications.. .................................................................................................................................................... l-1
Accessories.. ................................................................................................................................................. 1-I
.....
. .
Repacking for Shipment ...................................................................................................................................... l-2
Operation
Introduction ......................................................................................................................................................... 2-1
Preparation for Use ............................................................................................................................................. 2-1
Correct Line Voltage. .................................................................................................................................. 2-1
Plug-In Card (Scanner) Installation ............................................................................................................ 2- 1
Power-up ....... ...................................................................................................................................................... 2-l
Environmental Conditions .................................................................................................................................. 2-3
Operating Instructions ......................................................................................................................................... 2-3
Front Panel Controls ................................................................................................................................... 2-3
Rear Panel Description ................................................................................................................................ 2-5
Basic Front Panel Operation ....................................................................... 2-7
................................................
Front Panel Programs.. ........................................................................................................................ 2-13
..............
Program 0 Digital I/O .................................................................................................................... 2-13
.......... ,
Program 1 Date Format ............................................................................................................................. 2-13
Program 2 Settle Time .............................................................................................................................. 2- 1-l
Program 3 Primary Address.. .................................................................................................................... 2-14
Program 4 Save Present Relay Set Up.. .................................................................................................... 2- 15
Program 5 Recall Stored Relay Set Up.. ................................................................................................... 2- 15
Program 6 Pole Modes.. ............................................................................................................................ 2-16
Program 7 Set Alarm Time ....................................................................................................................... 2-17
Program 8 Self Test ................................................................................................................................... 2-18
Program 90 Stand Alone.. ......................................................................................................................... 2-18
Program 9 1 Master.. .................................................................................................................................. 2- 18
Program 92 Slave ...................................................................................................................................... 2-19
Program 99 Reset.. .................................................................................................................................... 2- 19

3
5 Maintenance
IEEEBusOperation
Introduction ......................................................................................................................................................... 3-I
Soltwarc Considcrstions .............................................................................................................................. 3- !
HP-85 BASIC Statements ........................................................................................................................... .3-I
Interface Function Codes ............................................................................................................................. 3-2
Model 705 Interface Commands.. ............................................................................................................... i-.3
IEEE-388 Bus Lines ............................................................................................................................................ .3-?
Bus Management Lines.. ............................................................................................................................. 3-3
Handshake Lines ......................................................................................................................................... 3-J
Data Lines.. .................................................................................................................................................. .3-J
System Set up Procedure.. ................................................................................................................................... 3-4
Bus Commands .................................................................................................................................................... j-5
Uniline Commands.. .................................................................................................................................... .3-5
Universal Commands .................................................................................................................................. 3-6
Addressed Commands.. ........................................................................................................... 3-7
-
....................
Device-Dependent Commands ................................... ......................................................................................... 3-8
-
Display Mode .............................................................................................................................................. 1-8
-
Program (Scan) hlode.. .............................................................................................................................. 3- 12
Prefix ......................................................................................................................................................... 3-12
.
EOI ............................................................................................................................................................ 3-12
-
Bus Response hlodc (SRQ I
....................................................................................................................... .?-13
Trigger Modes .......................................................................................................................................... 3-35
.
Programmable Terminator IY). ................................................................................................................. 3-15
Inputs ......................................................................................................................................................... i-15
-
Status Byte Format ............................................................................................................................................ 3-23
Status Word (UO). ............................................................................................................................................. 3-23
.
Front Panel Programs ........................................................................................................................................ 3.24
_
Front Panel Error Messages ............................................................................................................................... 3-24
.
IDDC Error ................................................................................................................................ ................ 1-25
.
No Remote Error.. ..................................................................................................................................... 3-25
.
Scanning Program ............................................................................................................................................. 3-25
-
Theory of Operation
Introduction ......................................................................................................................................................... 4- I
Power Supply.. ..................................................................................................................................................... 4 I
Microcomputer .................................................................................................................................................... 4- I
Display Circuit.. ................................................................................................................................................... 4-3
IEEE-488 Interface Circuitry .............................................................................................................................. 4-3
Introduction 5-l
-
...................... ...................................................................................................................................
Fuse Replacement 4-I
.................................................................................................................................................
Lint Voltage Selection ........................................................................................................................................ S-l
Disassembly ............................................................................................................ :............................................ 5-1
Troubleshooting.. ................................................................................................................................................. 5-3
Digital Self Test.. ............................................................. .................................................................................... 5-3
_
Battery Charge ..................................................................................................................................................... 5-3

ReplaceableParts
Introduction.. ....................................................................................................................................................... h-l
Parts List ............................................................................................................................................................. 6-I
Ordering In~orniation .......................................................................................................................................... h- I
Factory Service.. .................................................................................................................................................. 6- I
Schematic Diagrams and Component Location Drawings ................................................................................. 6- I
III

2
Figure 2- 1
Figure 2-2
Figure 2-3
3 IEEEBusOperation
Bus Structure.... . ........ 3-3
. ...............................................................................................................................
Handshake Sequence... ....................................................................................................~.................. . . ...I. 3-4
Contact Assignment . ..........................................................................
....................................................... 3-5
_
Model 705 IEEE Bus Connector ................................................................................................................. 3-5
Digital I/O Port Pin Assignments.. ............................................................................................................ 1-19
-
LJand G Modes Sequence .. .......
............................................................................................................... 3-23
Status B) te Format ...................
................................................................................................................. 7-23
-
U4 Status Word (Reset conditions shown) .. . ......................................................................................... 1-24
-
IEEE Display Error Messages ............
....................................................................................................... 3-25
Figure 3- 1
Figure 3-2
Figure 3-3
Figure 3-4
Figure 3-5
Figure 3-6
Figure 3-7
Figure 3-8
Figure 3-9
4 Theory of Operation
Figure 4-l Model 705 Block Diagram .......................................................................................................................... 4-2
Figure 4-2 Memory Map ............................................................................................................................................... 4-l
5
Figure 5- 1
6 ReplaceableParts
Figure 6- 1 Interconnect Board, Component Location Drawing, Dwg. No. 705- 160.. ................................................. 6-7
Figure 6-2 Display Board, Component Location Drawin,.u Dwg. No. 705-I 10........................................................... 6-9
Figure 6-3 I/O Board, Component Location Drawing, Dwg. No. 705-173 ................................................................ 6-11
Figure 6-4 Mother Board. Component Location Drawing, Dwg. No. 705-100 ......................................................... 6-13
Figure 6-5 Mother Board, Schetnatic Diagram, Dwg. No, 7OS- 106.. ......................................................................... 6- 17
Figure 6-6 Display Board, Schematic Diagram, Dwg. No. 705-I 16.......................................................................... 6-23
Figure 6-7 I/O Board, Schematic Diagram, Dwg. No. 705-176 ................................................................................. 6-25
Figure 6-8 Interconnect Board, Schematic Diagram, Dwg. No. 705- 166 .................................................................. 6-27
Listof Illustrations
Operation
Scanner Card Installation 1-7
............................................................................................................................ i -
Model 705 Front and Rear Panels.. ............................................................................................................. 2-6
Daisy Chaining Three Model 705’s.. .......................................................................................................... 2-9
Maintenance
Model 705 Exploded View ,,.................,.,......,............................................................................................ 5-2

2
Table 2-l Line Voltage Setting ................................................................................................................................... 2- I
Table 2-2 Power Up Default Conditions (Front Panel Operation). ............................................................................. 2-3
Table 2-3 Summary of Front Panel Programs ........................................................................................................... 2- I.3
Table 2-4 Switchins Card Pole Modes ...................................................................................................................... 2- 16
Table 2-S Program 99 Reset Conditions ................................................................................................................... 2-20
3 IEEEBusOperation
Table I- 1
Table i-2
Table 3-3
Table i-4
Table 3-5
Table 3-6
Table 3-7
Table 3-8
Table 3-9
Table 3-10
5 Maintenance
Table 5-l Fuse Replacement. 3AG size.. .................................................................................................................... 5- I
Table 5-2 Fuse Replacement. 5mm size.. .................................................................................................................... 5-I
Table 5-3 Line Voltage Selection.. .............................................................................................................................. 5-I
6 ReplaceableParts
Table 6- 1 Index of ~Modcl 705 Schematics and Component Layouts.. ....................................................................... 6- 1
Table 6-2 Display Board 705-I IO. Parts List.. ............................................................................................................ 6-2
Table 6-3 Mother Board 705- 103. Parts List.. ............................................................................................................. 6-3
Table 6-4 Digital I/O Board 705 173. Parts List.. ....................................................................................................... 6-5
Table 6-5 k/lode1 705 Mechanical Parts List ............................................................................................................... 6-6
Listof Tables
Operation
HP-85 IEEE-488 BASIC Statements.. ........................................................................................................ 3-2
Model 705 Interface Function Codes.. ........................................................................................................ 3-3
IEEE Command Groups.. ............................................................................................................................ 3-3
IEEE Bus Connector Contact Designations.. .............................................................................................. 3-5
Power-Up Default Values 1-6
............................................................................................................................
SDC Set Conditions ............. ....................................................................................................................... 1-7
-
Device-Dependent Comtnands ................................................................................................................... 3-9
_
Hierarchy of Command Execution Z-10
............................................................................................................
SRQ Commands and Conditions .......... .................................................................................................... 3-13
-
Digital I/O Port Contact Pin Assignments. ............................................................................................... 3-20
vii

SECTION 1
GENERAL INFORMATION
1.1 INTRODUCTION
The Model 705 is a low cost IEEE compatible scanner. The
basic mainframe can accomodate two plug-in scanner cards.
Each card can have different pole configurations. In the l-pole
configuration the card has 20 channels, The 4-pole configura-
tion allows 10 channels with two cards (for four-wire ohms).
Using the “daisy chain” method the Model 705, along with
four additional Model 705’s, can provide up to 100 2-pole
channels. The time and the date are kept internally with a bat-
tery backed up clock allowing time dependent procedures to
be performed,
The controls on the front panel allow opening a selected chan-
nel, closing the channel, scanning between a selectable first
and last channel, selectable scan rate and mode. There are 13
internal programs that are accessible from the front panel. The
programs can select primary address, dwell time, store a relay
set up, recall the stored relay set up, control the digital l/O
port, switch from International to American date format, con-
trol interval stop/start and select I-, 2- or 4 pole measurement
modes.
The Model 705 Scanner adheres to standard IEEE-488 inter-
face bus protocol. This enables the Model 705 to be incor-
porated into any measurement system that uses programmed
control through the IEEE-488 bus.
1.2 FEATURES
The Model 705 Scanner includes the following features:
*IEEE-488 bus operation.
*Selectable scan rate from IOms to 999.999sec.
*Selectable scan modes that allow the operator to scan the
first channel to the last channel once, continuously or
manually.
*Thirteen internal programs that are available through the front
panel.
*Model 705 mainframe can accomodate two scanner plug-in
cards.
aSeveral different scanner relay cards are available as options.
They include: a general purpose relay card; a thermocouple
relay card; a low voltage relay card; and a low current relay
card.
*Time and date are kept with a battery backed up clock.
*Digital I/O port with eight lines as inputs and eight lines as
outputs.
1.3 WARRANTY INFORMATION
Warranty information is provided on the inside front cover of
this manual. If there is a need to exercise the warranty, contact
the Keithley representative in your area to determine the proper
action to be taken. Keithley maintains complete repair and
calibration facilities in the United States, West Germany, Great
Britain, France, the Netherlands, Switzerland and Austria. In-
formation concerning the application, operation or service of
your instrument may be directed to the applications engineer at
any of the above locations. Check the inside front cover of this
manual for addresses.
l’.4 MANUAL ADDENDA
Improvements or changes to this manual will be explained on
an addendum included with this manual,
1.5 SAFETY SYMBOLS AND TERMS
Safety symbols used in this manual are as follows:
The symbol A on the instrument denotes that the user
should refer to the operating instructions.
The symbol /v on the instrument denotes that IOOOV or
more may be present on the terminal(s).
The WARNING used in this manual explains dangers that
could result in personal injury or death.
The CAUTION used in this manual explains hazards that
could damage the instrument.
1.6 UNPACKING AND INSPECTION
The Model 705 is inspected both mechanically and electrically
before shipment. Upon receiving the Model 705 unpack all
items from the shipping container and check for any obvious
damage that may have occurred during transit. Report any
damage to the shipping agent. Retain and use the original
packaging materials if reshipment is necessary. The following
items are shipped with all Model 705 orders:
*Model 705 Scanner
*Model 705 Instruction Manual
*Optional accessories per request.
1.7 SPECIFICATIONS
For Model 705 detailed specifications, refer to the specifica-
tions that precede this section.
1.8 ACCESSORIES
Model 1019A Rack Mounting Kit-The Model 1019A rack’
mounting kit can accomodate one or two Model 705’s. The’
dimensions are 133mm x 483mm (5% x 19in).
Model 1019s Slide Rack Mounting Kit-Enables one or
two half rack size instruments to be rack mounted with the
added feature of sliding the instrument(s) for easy access.
The dimensions are 133mm x 483mm (5% x Igin.).
l-l

Model 7055 Quick Disconnect Card-The Model 7055 is
an integral part of the Model 7056 General Purpose Scanner
Card. The Model 7055 is the section of the Model 7056 that
provides the input and output connections. Several Model
7055s can be prewired for particular applications, When that
particular application is required the present Model 7055 can
be replaced with another Model 7055.
Model 7056 General Purpose Scanner Plug-In Card-The
Model 7056 is field installable in the Model 705 Scanner main-
frame. The general purpose card will switch up to 10 2-pole
channels. The card can be used as a voltage scanner, indepen-
dent relay card or a matrix card. The 2-pole switching is ac-
complished in less than 10ms and the expected relay life is 106
closures at the maximum contact ratings. Barrier strips are
used to facilitate input and output connections to the relay
scanner plug-in card. The plug-in card can be easily removed
through the rear panel of the Model 705.
Model 7057 Thermocouple Scanner Plug-In Card-The
Model 7057 is a low voltage scanner card which is field install-
able in the Model 705 scanner mainframe. Since it combines
the functions of a thermocouple scanner and uniform tempera-
ture reference it is especially useful for scanning thermo-
couples. The input terminals are #I10 alloy-copper set in an
isothermal block to minimize temperature differences. A ther-
mistor sensor within the isothermal block is used with a bridge
network on a Model 7057 to give an indication of the
temperature reference or cold junction. The temperature of the
heat sink is used to calculate the corrected thermocouple out-
put. The output voltages of each thermocouple must be con-
verted to temperature (OC or OF) using appropriate thermo-
couple tables or polynomial equations. In addition any channel
may be used to monitor low level signals. The Model 7057
uses two form A contacts for scanning of signals up to 35V
peak or 100mA peak. Input and output connections are made
through the rear panel of the scanner mainframe using #4
screw terminals on the Model 7057.
Model 7058 Low Current Scanner Plug-In Card-The
Model 7058 is field installable in the Model 705 Scanner Main-
frame. The low current card will switch up to 10 l-pole chan-
nels. For optimum low level current switching, the Model 7058
is designed to minimize offset current error (less than I pAI,
while guarding ensures that high isolation is maintained be-
tween input signals. The break-before-make, single pole
switching of the Model 7058 is designed to maintain current
paths for signals not connected to the output, or when internal
jumpers are removed to provide high input resistance for mak-
ing voltage measurements. AC or DC signals up to 28V or
100mA may be scanned. Triaxial input and output connections
to the scanner plug-in card are easily made through the rear
panel of the Model 705 Scanner mainframe.
Model 7059 Low Voltage Plug-In Card-The Model 7059 is
a low voltage scanner plug-in card which is field installable in
the Model 705 Scanner mainframe. The Model 7059 will
switch up to 10 channels. For low level transducer and thermo-
couple output switching the Model 7059 is designed to
minimize thermal error voltage (less than 1p.V with respect to
copper) and ensure that high isolation (10X2) is maintained
between input signals. The break-before-make, 2-pole switch-
ing is accomplished in less than 5ms. Expected relay life (108
closures) is obtained when signals less than IOV or less than
10mA are scanned. However, peak signals up to 200V or
IOOmA may be scanned. Barrier strips are used to facilitate in-
put and output connections to the scanner plug-in card. The
Model 7059 is easily removed through the rear panel of the
Model 705 Scanner mainframe.
Model 7008-3 IEEE-488 Cable-The Model 7008-3 is a three
foot (I meter) IEEE-488 cable. The cable has 24 stranded wire
conductors and is terminated with IEEE-488 standard connec-
tors.
Model 7008-6 IEEE-488 Cable-The Model 7008-6 is a six
foot (2 meter) IEEE-488 cable. The cable has 24 stranded wire
conductors and is terminated with IEEE-488 standard connec-
tors.
Model 4801 Low Noise BNC to BNC Cable-The Model
4801 is a low noise BNC-to-BNC cable which is especially
useful for “daisy chain” wiring configurations of multiple
Model 705’s.
Model 7010 Cable Adapter-The Model 7010 is an IEEE-488
cable adapter. The adapter extends the IEEE-488 connector by
one connecter width.
1.9 REPACKING FOR SHIPMENT
The Model 705 should be packed in its original carton. Before
packaging, wrap the instrument in plastic. After it is placed in
the box, surround the instrument with Styrofoam packaging
material.
If the Model 705 is to be returned to Keithley Instruments for
calibration or repair, include the following:
*ATTENTION REPAIR DEPARTMENT on the address label.
*Warranty status of the instrument.
*Completed service form.
1-2

SECTION 2
OPERATION
2.1 INTRODUCTION
This section contains information necessary to operate the
Model 705 Scanner. Information is arranged as follows:
*Preparation For Use
*Power-Up
*Environmental Conditions
*Front and Rear Panels Description
*Front Panel Operation
*Front Panel Programs
2.2 PREPARATION FOR USE
2.2.1 Correct Line Voltage
Plug the Model 705 into the proper power receptacle, (See
Table 2-l 1. For fuse replacement or line voltage switch setting,
refer to the maintenance section.
WARNING
Ground the instrument through a properly
earth grounded receptacle before operation.
Failure to ground the instrument can result
in severe injury or death in the event of short
circuit or malfunction.
Table 2-1. Line Voltage Setting
*Requires special factory installed transformer.
2.2.2 Plug-In Card (Scanner) Installation
Before operating the Model 705, the necessary plug-in cards
must be installed into the mainframe. The scanner plug-in card
is installed via the opening on the Model 705 rear panel. Refer
to Figure 2-l for an overall picture of plug-in card installation.
WARNING
To prevent a possible shock hazard, turn the
instrument off and remove the line cord
before removing or installing any scanner
plug-in card.
1. To install a plug-in card, slide the plug-in card into the rear
panel opening with the component side facing up. Make
certain the card edges are aligned with the grooves in the
receptacle. When the card is fully inserted, the locking tabs
on the card should be snapped into the locked position as
shown in Figure 2-1. .
2. To remove a plug-in card, unfasten the locking tabs by pull-
ing both tabs outward. Grasp the end of the card and pull it
out of the mainframe,
NOTE
Handle the plug in cards by the edges to avoid
contaminating them with dirt, body oil etc.
2.3 POWER-UP NOTE
Batten/ BIOI is charging while the unit is on.
Refer to paragraph 5.7.
Immediately after turning on the Model 705 via the power
switch, the display indicates the following for several seconds:
1. This is a display test. The operator can note inoperative
display segments by comparing the Model 705’s display
with the figure above.
2. In addition, the push button and the TALK, LISTEN and
REMOTE indicators turn on. All indicators turn on
simultaneously if operating correctly.
After the test is complete, the Model 705 displays the software
revision level for approximately one second.
After the software revision level is displayed, the Model 705
displays the primary address of the instrument for approx-
imately one second. The primary address of the Model 705 is
factory set at 17.
During the display test the Model 705 performs a digital self
test of the RAM circuitry and a cyclic redundancy check of the
ROM circuitry. If the self test or CRC reveals a problem with
the ROM or RAM circuitry the Model 705 displays a diagnostic
number. This number, and its meaning, is explained in detail in
Section 5.
After all the displays and tests of the power up cycle, the
Model 705 comes up to the default conditions. Refer to Table
2-2 for default conditions.
NOTE
If upon power-up the Model 705 displays the
slave or broken loop message (refer to paragraphs
2.6.10, 2.6.11 and 2.6.12) activate program 90 to
return the Model 705 to normal operating condi-
tions. To activate program 90, press PRGM, 9, 0.

-SCANNER CARD
INSTALLED
CARD-
SLOTS
r4x-SCANNER CARD
Figure 2-l. Scanner Card Installation
2-2

Table 2-2. Power Up Default Conditions (Front Panel
Operation)
Function or
Program Default Conditions
CHANNEL Channel mode is selected, Channel 1 is
displayed and all channels are open.*
TIME Time is not affected by power up.
DATE Date is not affected by power up.
RESET Reset is not affected by power up.
INTERVAL Interval time is not affected by power up.
SINGLE Single scan mode is set to inactive.
CONTINUOUS Continuous scan mode is set to inactive.
START/STOP Start/Stop function is set to Stop.
Program 0 Digital I/O outputs are set to 000, inputs
are not affected by power up.
Program 1
Program 2
Program 3
Program 4
Program 5
Program 6
Date format is not affected by power up.
Settle time is not affected by power up.
Primary address is not affected by power
up.
Save relay set up is cleared.
Recall relay set up is cleared.
Number of poles is not affected by power
Program 7
Program 8
Program 90
Program 91
Program 92
Program 99
FIRST
LAST
Ayirrn time is set to 00.00.00.
Self test is not activated.
Program 90 is not affected by power up.
Program 91 is not affected by power up.
Program 92 is not affected by power up.
Program 99 is not activated.
The First function is not affected by powe
up.
The Last function is not affected by powe
up*
*If Channel 1 was previously programmed as the first chan-
nel, last channel or both it is displayed as such. This is because
the FIRST and LAST functions are battery backed up and
therefore not affected by power up.
NOTE
To identify the previous state of the functions
that are not affected by power up simply activate
the desired function. When the function is acti-
vated the previous state for that function is dis-
played. Refer to paragraph 2.5.1 Front Panel
Controls for information concerning the actuation
of the desired function.
2.4 ENVIRONMENTAL CONDITIONS
All operation of the Model 705 should take place at an ambient
temperature within the range of O°C to 50°C, up to 35OC at
80% noncondensing relative humidity. Environmental condi-
tions for storage are -25OC to + 65OC.
2.5 OPERATING INSTRUCTIONS
2.5.1 Front Panel Controls
1, The power ON/OFF switch operates on the push-push prin-
ciple. Depressing this button turns the instrument on. Once
the instrument is on, pressing (releasing) this button turns
the instrument off. When the Model 705 is turned on it goes
through a power-up sequence as outlined in paragraph 2.3.
When the power-up sequence is complete the Model 705
displays the following:
r DI F.a
I
01 = Channel Number One
F= First Channel*
0 = Channel Open
The CHANNEL LED lights, indicating that the Model 705 is
in the channel mode.
*If Channel 1 was previously progammed as the first channel,
last channel or both, it is displayed as such. This is because -li
the FIRST and LAST functions are battery backed up and
not affected by power up.
2. The CHANNEL button selects the channel mode for display.
The channel number is displayed on the front panel as a two
digit number. Upon power-up, the Model 705 reverts to the
channel mode. Pressing the CHANNEL button while the
Model 705 is in the channel mode increments the channel
number by one. Pressing the CLOCK, DATE, PRGM,
SINGLE, CONTINUOUS or INTERVAL buttons takes the
Model 705 out of the channel mode. Pressing the RESET
button during any of the front panel programs except Pro-
grams 90, 91, 92 and 99 (see paragraph 2.6 for front panel
program information) reverts the Model 705 to the channel
mode.
3. The OPERATION group consists of four buttons: FIRST,
LAST, CLOSE and OPEN. The buttons are described as
follows:
A. The CLOSE button when activated, closes the presently
displayed channel. If the presently displayed channel is
already closed, pressing the CLOSE button has no effect
on the channel. When the presently displayed channel is
open and the CLOSE button is pressed, the open and
closed digit (furthest digit on the right of the display)
changes as follows.
/
0 Indicates a channel is open, and that C indicates a
channel is closed.
B. The OPEN button when activated, opens the presently
displayed channel. If the presently displayed channel is
already open, pressing the OPEN button has no effect on
the channel. When the presently displayed channel is
closed, and the OPEN button is pressed, the open and
close digit (furthest digit on the right of the display)
changes as follows.
2-3

C Indicates a closed channel, and that 0 indicates an
open channel.
NOTE
Close and open for each channel remain valid
even when not viewing the channel or the
display.
C. The FIRST button, when pressed, specifies the presently
displayed channel as the first channel of a multichannel
configuration. If the presently displayed channel has
already been specified as the first channel, pressing the
FIRST button has no effect on the channel or the
display. If the presently displayed channel has not been
specified as the first channel, the display format is shown
as follows:
11
01 = Present Channel
0 = Channel Open
Pressing the FIRST button specifies the channel as the
first channel and the display format is shown as follows:
D.
2-4
1 UI f 3/
01 = Present Channel
F = First channel of a multichannel configuration
0 = Channel open
NOTE
There are two ways to change the specified first
channel, one is to select the desired new channel
and then press the FIRST button; the other way
is to activiate front panel Program 99 (refer to
paragraph 2.6). Powering the unit down will not
change the specified first channel.
The LAST button when pressed specifies the presently
displayed channel as the last channel of a multichannel
configuration. If the presently displayed channel has
already been specified as the last channel, pressing the
LAST button has no effect on the channel or the display.
If the presently displayed channel has not been specified
as the last channel of a multichannel configuration, the
display format is as follows:
I 113 ul
t
10 = Present Channel
0 = Channel Open
I
Pressing the LAST button specifies the channel as the
last channel of a multichannel configuration and the
display format is as follows:
L I
10 = Present Channel
L= Last Channel of a Multichannel Configuration
0 = Channel Open
NOTE
There are two ways to change the specified last
channel, one is to select the desired new channel
and then press the LAST button, the other way is
to activate front panel Program 99 (refer to
paragraph 2.6). Powering the unit down will not
change the specified last channel.
4. The CONTROL group of buttons consist of the RESET but-
ton and the INTERVAL button. The buttons are described
as follows:
A.
B
The RESET button opens all channels of the Model 705
and reverts the display to the specified first channel. The
RESET button is inactive in the time, interval and date
modes. Pressing the RESET button during a Single or
Continuous scan mode sequence stops the scan
mode, opens all the channels, and reverts the display
to the specified first channel.
The INTERVAL button selects the programmed interval
time for display. The inten/al time is the programmed
time each channel is closed when using the single, con-
tinuous, or step scanning modes. The interval time
ranges from 5msec to 999.999sec in 1msec increments.
Upon the actuation of front panel Program 99 the interval
time is reverted to the default condition of 10msec
(displayed as 000.010). Powering the unit down will not
change the programmed interval time. Two ways the in-
terval time can be changed is either, activate front panel
Program 99; (see paragraph 2.6) or press the INTERVAL
button, and then press the appropriate numbers from
000.010 to 999.999 and the ENTER button.
5. The DATA group of buttons consist of the O-9, CANCEL
and ENTER buttons. They are described as follows:
A.
B.
C.
The O-9 data keys allow entry of numerical data onto the
display. The O-9 keys can be used to enter numerical
constants on the display for certain functions such as in-
terval time, channel number, front panel programs, time
and date.
The ENTER button loads the displayed data for the inter-
val time, date and program modes into the Model 705. In
the PRGM mode, the ENTER button initiates the select-
ed program (0, 1,2, 3, 6 or 7) after the necessary data is
entered onto the display. Refer to paragraph 2.6 for infor-
mation concerning the front panel programs.
During the entry of data (c segment cursor is flashing)
the CANCEL button cancels the present display and
reverts the instrument to the previous display. The
CANCEL button is functional only when entering data
onto the display in the interval, time, date and program
modes.

6. The SCAN group of buttons consists of the SINGLE, CON-
TINUOUS and START/STOP buttons. These three buttons
select the different scan modes. The SCAN group of but-
tons are described as follows:
A. The CONTINUOUS button selects the continuous scan
B.
C.
mode. The continuous scan mode allows the user to
scan through the programmed channels at the program-
med interval rate continuously. The continuous scan
mode is initiated upon the actuation of the
START/STOP button or upon receiving the appropriate
external trigger pulse. Pressing the START/STOP but-
ton while the continuous scan mode is running stops the
scan at the presently displayed channel. Pressing the
START/STOP button again starts the continuous scan
at the channel in which it was stopped.
The SINGLE button selects the single scan mode. The
single scan mode allows the user to scan through the
programmed channels at the programmed interval rate
one time. The single scan mode is initiated upon the ac-
tuation of the START/STOP button or upon receiving
the appropriate external trigger pulse. Pressing the
START/STOP button while the single scan mode is run-
ning stops the scan at the presently displayed channel.
Unless interrupted, the single scan mode will scan
through the programmed channels at the programmed
interval rate and then stop at the programmed first chan-
nel.
The START/STOP button is an alternate action control
that has three functions. The three functions are the
START function, the STOP function and the STEP scan
mode. They are described as follows:
a. The start function of the START/STOP button in-
itiates the selected scan mode. When all the para-
meters (interval, time, first and last channels, scan
mode, etc.) of a multichannel configuration have
been programmed and the user is ready to scan the
channels, press the START/STOP button to initiate
the scan. During the scan mode the START/STOP
LED is activated.
b. The stop function of the START/STOP button stops
the previously initiated scan mode. That is, pressing
the START/STOP button during a scan stops the
sequence at the presently displayed channel and turns
off the START/STOP LED. The stop function of the
START/STOP button is active only when a scanning
sequence is scanning.
c. The step scan mode allows the user to manually step
through the programmed channels. The step scan
mode is selected by pressing the channel button, pro-
gramming the interval time and pressing the
START/STOP button. When the interval time has
been programmed and the user is ready to manually
scan the channels, press the START/STOP button to
scan (closed and open channel at the programmed in-
terval time) one channel. Upon initiating the step scan
mode the START/STOP LED turns on, the presently
displayed channel is closed for the programmed inter-
val rate, the channel is opened, the START/STOP
LED turns off and the Model 705 advances to the next
channel. To scan the next channel press the
START/STOP button and the Model 705 will go
through the same sequence.
7. The CLOCK group consists of two buttons that control the
display of the time function and the date function. The clock
continues to run after the instrument is powered down
because the clock’s power circuitn/ is backed up by battery
BTlOl. The two clock buttons are described as follows:
A. The TIME button selects for display the 24 hour time
clock. The format showing 2:45 p.m. is as follows:
I IYYS.UU /
i I
The time can be set by pressing the TIME button, enter-
ing the appropriate time onto the display and then press-
ing the ENTER button.
B. The DATE button selects the date mode for display. The
date display has two formats., The formats showing
Auaust 18th are as follows:
American date format cl0 I8
International date format Ifm3 I
I I
The formats are selected by front panel Program 1. Refer
to paragraph 2.5 6 for information concerning the front
panel programs. The date can be set by pressing the
DATE button, entering the appropriate date onto the
display and then pressing ENTER.
8. The PRGM button when pressed shows a display that pro-
mpts the user to select one of the 13 front panel programs.
Refer to paragraph 2.6 for complete details and examples of
the front panel programs.
9. The IEEE bus indicators (TALK, LISTEN and REMOTE)
identify the present status of the IEEE-488 bus. The in-
dicators are described as follows:
A. The TALK LED when lit indicates that the Model 705 is
in the talk mode. The Model 705 does not have to be in
the remote mode for it to be in the talk mode.
B. The LISTEN LED when lit indicates that the Model 705 is
in the listen mode. The Model 705 must also be in the
remote mode for it to be in the listen mode.
C. The REMOTE LED when lit indicates that the Model 705
is in the remote mode.
2.5.2 Rear Panel Description
1. The two plug-in slots in the Model 705 mainframe can ac-
comodate two relay scanner cards. The Model 705 with two
relay scanner cards has up to 20 2-pole individual channels.
Refer to paragraph 2.2.2 for instructions on how to remove
or install the various plug-in cards.
2-5

fi?ciEq 705 SCANNER
\ 4
OPERATION
i
POWER
a ON
1 OFF
SCAN . PRGM
RESET INTERVAL CONTINUOUS
sl fl q
/\ IC
4
L&l
n
v
0
SERIAL
I
ALARM /
OUT SERIAL IN
@-/-@I
LINE
FUSE
L
f~.:,~~;:G;O
m<~t~~cncoaouL
IEEE 488 INTERFACE I LINE RATING SLOWSLOW
50-400 Hz AC ONLY 3ll6A 90- 125V
25 VA MAX l/lOA 195-250V
LINE VOLTAGE
SELECTED (INTERNAL)
go-1lOV 0 195-235v a
105-125V 0 210-250V 0
DATA
7 8 9
q ncl
hxl
0 CANCEL ENTER
non
DIGITAL I/O
30V ‘MAX.
h
Figure 2-2. Model 705 Front and Rear Panels
2-6

2. The EXTERNAL TRIGGER is a BNC connector that initiates
the selected scan mode (single, step or continuous) in the
same manner as the START/STOP button, The input trig-
ger pulse must be a negative going pulse at a TTL level with
a minimum duration of 2+ec. The selected program mode
is initiated upon the negative transition of the pulse. This
feature can be used to trigger the Model 705 into the
selected scan mode using another instrument.
3. CHANNEL READY is a BNC output connector that provides
a negative going TTL level pulse of greater than lO@ec at
the completion of the programmed channel settling time.
This feature can be used to inform another instrument (e.g.
DMM, Source, etc,) that the present channel settling time is
completed.
4. The ALARM/SERIAL IN connector has two functions. The
Alarm out function and the SERIAL IN function. As the
Alarm out function the Model 705 outputs a negative going
TTL level greater than 10pec pulse to the ALARM/SERIAL
IN connector. When the Alarm time is set to 00.00.00 the
pulse does not appear. The SERIAL IN function is used in a
daisy chain configuration where the SERIAL IN connector is
connected to the SERIAL OUT connector of another Model
705. Refer to paragraph 2.5.3 example 4 for more informa-
tion.
5. SERIAL OUT is a BNC output connector that provides con-
nection to another Model 705 for a daisy chain configura-
tion. Refer to Figure 2-3 for a typical daisy chain configura-
tion. The SERIAL OUT connector is applied to the
ALARM/SERIAL IN connector of another Model 705.
6. The Digital I/O port consists of 16 digital input/output lines
along with four lines that are + 5V and IEEE common. Eight
of the I/O lines can be used for inputs and eight can be used
for outputs. This allows the user a limited number of control
lines to the IEEE bus. The outputs will drive one TTL load
and the inputs are TTL compatible. For more information
concerning the digital I/O port refer to paragraph 3.5.8/16.
7. The IEEE bus connector provides bus connection to the
Model 705. The connector mates with the Keithley Model
7008-3 and Model 7008-6 cables. For more detailed infor-
mation concerning the IEEE connector refer to paragraph
3.3.
8. The line power fuse is rated as specified in Table 5-l.
9. The line power receptacle mates with three wire line cord
which provides connections to line voltage. For correct line
voltage selection refer to paragraph 5.3.
2.5.3 Basic Front Panel Operation
This section provides the information necessary for basic front
panel operation of the Model 705. There are a number of steps
to follow in order to get the Model 705 ready for scanning
operation. These steps are as follows:
1. Install the desired scanner card(s). Refer to paragraph 2.2.2
for information concerning the installation of the scanner
cards into the Model 705.
2. Select appropriate line voltage. Refer to paragraph 2.2.1 for
information concerning the selection of the appropriate line
voltage. Turn the Model 705 on. The instrument goes
through the power-up sequence described in paragraph 2.3
and displays the following:
I III f o!
NOTE
Channel 1 is set as the programmed first channel,
unless the unit was previously programmed for
another channel then that channel is displayed.
3. Program the desired channel.
A. Select the first channel.
a. Press the desired channel number from the DATA
group buttons O-9.
b. Press the FIRST button to program the present chan-
nel as the first channel.
NOTE
Selecting a channel that does not exist in the pre-
sent set up causes the Model 705 to display the
following message.
/-Ia l-h
9. Select the last channel:
a. Press the desired number from the DATA group but-
tons O-9.
b. Press the LAST button to program the present chan-
nel as the last channel.
4. Program the desired number of poles (I-, 2- or 4-pole).
A. Press PRGM.
9. Press 6 (refer to paragraph 2.6.7).
C. Select number of poles l-, 2- or 4-pole.
D. Press ENTER.
5. Program the interval time
A. Press the INTERVAL button to select the interval mode
for display.
9. Enter the interval time on the display by pressing from
the DATA group, desired time 000.010 to 999.999
seconds.
C. Press the ENTER button.
6. Program the desired scan mode. Press the SINGLE or CON-
TINUOUS button to select one of these two scanning
modes. To select the step scan mode press the channel but-
ton and the START/STOP button.
7. Press the START/STOP button to start the scanning
sequence. For the step scan mode press the START/STOP
button each time a single channel is to be scanned.
2-7

Steps 1 through 7 show how to get the Model 705 into a
scanning sequence. The next examples show how to use
the different scan modes, how to daisy chain several Model
705’s for an extended number of channels, and scanning
using different scanner cards,
Example 1 Manual Scan-The Model 705 can be program-
med for the step scan mode, if it is desired to scan through the
programmed channels manually. In the step scan mode the
programmed channels can be scanned (closed for the pro-
grammed interval rate and then opened) one channel at a time.
Upon the actuation of the START/STOP button a single chan-
nel will be scanned. For this example, choose the following
parameters:
1. First channel is 1.
2. Last channel is 10.
3. Interval time is two seconds.
4. Number of poles is two.
5. Use the step scan mode.
Use the following procedure to program the Model 705 for the
preceding parameters:
1. Install the desired scanner card into the Model 705. Refer to
paragraph 2.2.2.
2. Select the appropriate line voltage and turn the Model 705
on. Refer to paragraphs 2.2.1 and 2.3 respectively.
3. Press PRGM, 6, 2, ENTER. For more complete information
refer to paragraph 2.6.7.
4. Press 0, 1, FIRST. (Programs channel 1 as the first channel.)
5. Press 1, 0, LAST. (Programs channel 10 as the last
channel.)
6. Press INTERVAL, 0, 0, 2, 0, 0, 0, ENTER. (Programs the in-
terval time for two seconds.)
7. Press CHANNEL, RESET. (Selects the channel mode for
display and resets to the first channel.)
8. Press the START/STOP button to initiate the step scan
mode.
Upon the actuation of the START/STOP button in step 8,
channel 1 is closed and the START/STOP LED is turned on.
Channel 1 remains closed for two seconds (programmed inter-
val rate) and then opens, The START/STOP LED turns off
and the Model 705 advances to the next channel. To scan the
remaining channels press START/STOP button each time a
channel is to be scanned. When the last programmed channel
is scanned, in this example, it goes through the same pro-
cedure as previously stated. The difference is that after the
channel opens up and turns off the START/STOP LED, the
Model 705 resets to the first programmed channel.
To stop the scanning sequence and reset the Model 705 to the
programmed first channel simply press the RESET button.
Example 2 Single Scan-In the Single Scan mode all the
channels are scanned one time. The Scan runs as follows: the
first channel is closed for the programmed interval rate and
then opened. The Model 705 advances to the next channel,
closes it for the programmed interval rate and then opens the
channel. The sequence is repeated up to and including the pro-
grammed last channel, at this point the Model 705 reverts to
the programmed first channel and stops. Upon the actuation
of the START/STOP button all the programmed channels are
scanned at the programmed interval rate. For this example let
us choose the following parameters:
1. First channel is 3.
2. Last channel is 15.
3. Interval time is 0.5 seconds.
4. Number of poles is 2.
5. Use the single scan mode.
Use the following procedure to program the Model 705 for the
preceding parameters:
1. Install the desired scanner card into the Model 705. Refer to
paragraph 2.2.2
2. Select appropriate line voltage and turn the Model 705 on.
Refer to paragraphs 2.2.1 and 2.3 respectively.
3. Press PRGM, 6, 2, ENTER. For more complete details refer
to paragraph 2.6.7.
4. Press 0, 3, FIRST. (Programs channel 3 as the first channel.)
5. Press 1, 5, LAST. (Programs channel 15 as the last
channel.)
6. Press INTERVAL, 0, 0, 0, 5, 0, 0, ENTER (Programs the in-
terval time for 0.5 seconds.)
7. Press CHANNEL, RESET. (Turns on the CHANNEL LED,
selects the channel mode for display and resets to the pro-
grammed first channel.)
8. Press SINGLE. (Selects the single scan mode and turns on
the SINGLE LED.)
9. Press the START/STOP button to inititate the single scan
mode.
Upon the actuation of the START/STOP button in step 9,
channel 3 is closed for 0.5 seconds (programmed interval rate
and the START/STOP LED turns on). Channel 3 is opened
and the Model 705 advances to the next channel. Channel 4 is
closed for 0.5 seconds and then opens. The Model 705 then
advances to channel 5 and the cycle repeats itself until the last
channel is scanned (closed for the programmed interval rate
and then opened). At the end of the scan of the last channel,
the Model 705 resets to the programmed first channel and
turns off the START/STOP LED. At this point the single mode
has been completed.
Pressing the START/STOP button during a single scan stops
the scan at the presently displayed channel. The channel re-
mains closed and turns off the START/STOP LED. To start
the scanning sequence from the presently displayed channel
press the START/STOP button.
To stop the scanning sequence and reset the Model 705 to the
programmed first channel simply press the RESET button.
Example 3 Continuous Scan-In the Continuous scan mode
all the programmed channels are scanned continuously. The
scan runs as follows: the first channel is closed for the pro-
grammed interval rate and then opened. The Model 705 then
advances to the next channel, closes it for the programmed in-
terval rate and then opens the channel. The sequence is
2-8

repeated until the START/STOP button is pressed. Upon ac-
tuation of the START/STOP button all the programmed chan-
nels are scanned continuously at the programmed interval rate.
For this example choose the following parameters:
1. First channel is 5.
2. Last channel is 20.
3. Interval time is one second.
4. Number of poles is 2.
5. Use continuous scan mode.
Use the following procedure to program the Model 705 for the
preceding parameters:
I, Install the desired scanner card into the Model 705. Refer to
paragraph 2.2.2.
2. Select appropriate line voltage and turn the Model 705 on.
Refer to paragraphs 2.2.1 and 2.3 respectively.
3. Press PRGM, 6, 2, ENTER. For more complete details refer
to paragraph 2.6.7.
4. Press 0, 5, FIRST. (Programs channel 5 as the first channel.)
5. Press 2, 0, LAST. (Programs channel 20 as the last
channel.)
6. Press INTERVAL, 0, 0, 1, 0, 0, 0, ENTER. (Programs the in-
terval time for one second.)
7. Press CHANNEL, RESET. (Turns on the channel LED,
selects the channel mode for display and resets to the pro-
grammed first channel.)
8. Press CONTINUOUS. (Selects the continuous scan mode
and turns on the continuous LED.)
9. Press the START/STOP button to initiate the continuous
scan mode.
Upon the actuation of the START/STOP button in step 9,
channel 5 is closed for one second (programmed interval rate)
and the START/STOP LED turns on. Channel 5 is then open-
ed and the Model 705 advances to the next channel. Channel 6
closes for one second and then opens. The Model 705 ad-
vances to the next channel and the cycle repeats itself until the
last channel is scanned (closed for the programmed interval
rate and then opened). At the end of the scan of the last chan-
nel, the Model 705 resets to the programmed first channel and
then repeats the scanning sequence.
The scanning sequence can be stopped at any programmed
channel by simply pressing the START/STOP button. Press-
ing the START/STOP button during a continuous scan stops
the scan at the presently displayed channel, the channel re-
mains closed, and turns off the START/STOP LED. To start
the scanning sequence from the presently displayed channel
press the START/STOP button, After the scanning sequence
has stopped, pressing the START/STOP button starts the
sequence from the presently displayed channel and turns on
the START/STOP LED.
To stop the scanning sequence and reset the Model 705 to the
programmed first channel simply press the RESET button.
Example 4 Daisy Chaining-The Model 705 can be connect-
ed to other Model 705’s to increase the number of available
channels. A total of five Model 705’s can be daisy chained
together to increase the number of channels up to a maximum
of 100. Each Model 705 has the capability to support the plug-
in scanner cards. By daisy chaining the Model 705’s together,
there is one instrument designated as the master while the rest
of the Model 705’s are designated as slaves. The Model 705’s
are designated either master or slaves by front panel Programs
91 and 92 respectively. For complete details concerning front
panel programs refer to paragraph 2.6.
In this example the Model 705 will be programmed to scan 60
separate channels, Two additional Model 705 scanner main-
frames are needed to implement this example. The three
Model 705’s must be daisy chained together in order to have
the capability of the 60 2-pole channels. To daisy chain the
Model 705’s, refer to the circuit shown in Figure 2-3.
Each Model 705 will require two scanner cards in order to get
the channels needed for this example. To simplify, use six
Model 7056 general purpose scanner cards and select the
following parameters:
1. First channel is 1.
2. Last channel is 60.
3. Interval time is two seconds.
4. Number of poles is 2.
5. Use continuous scan mode.
Use the following procedure to program the Model 705 for the
preceding parameters:
1. Set up the circuit in Figure 2-3.
2. Install the plug-in scanner cards, two to each Model 705.
Refer to paragraph 2.2.2 for installation instructions.
MODEL 705
CONTROL
MAINFRAME
SERIAL
IN
r-r
MODEL 705
Figure 2-3. Daisy Chaining Three Model 705’s
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