Advanced Instruments 3300 User manual

3305SM Rev14 071009
Advanced®Micro-Osmometer Model 3300
Service Manual

3
1. Introduction
Specifications . . . . . . . . . . . . . . . . . . . . .7
General Description and Purpose . . . . .8
Service Assistance . . . . . . . . . . . . . . . . .8
Safety/Regulatory Information . . . . . . .9
2. General Overview
General Overview . . . . . . . . . . . . . . . .15
Systems Overview . . . . . . . . . . . . . . . .17
Power Supply . . . . . . . . . . . . . . . . . . . .17
Keypad . . . . . . . . . . . . . . . . . . . . . . . . .17
Front End . . . . . . . . . . . . . . . . . . . . . . .17
Instrument Software Update . . . . . . . .17
Control Board Set Description . . . . . .17
Processor Board . . . . . . . . . . . . . . . . .18
Application Board . . . . . . . . . . . . . . . .19
Design Changes . . . . . . . . . . . . . . . . . .23
Replacement Parts . . . . . . . . . . . . . . . .24
Supplies & Accessories . . . . . . . . . . . .24
3. Maintenance
Solenoid Cleaning Procedure . . . . . . .27
4. Troubleshooting
Introduction . . . . . . . . . . . . . . . . . . . . .31
Diagnostic Menu . . . . . . . . . . . . . . . . .31
Recall Results . . . . . . . . . . . . . . . . . . .31
Statistics . . . . . . . . . . . . . . . . . . . . . . . .31
Set Probe Bin #s . . . . . . . . . . . . . . . . .32
A/D Tests . . . . . . . . . . . . . . . . . . . . . . .32
Solenoid Test . . . . . . . . . . . . . . . . . . . .32
Probe Bin Test . . . . . . . . . . . . . . . . . . .32
Barcode Test . . . . . . . . . . . . . . . . . . . .33
Display/Print Test . . . . . . . . . . . . . . . .33
Beeper Test . . . . . . . . . . . . . . . . . . . . .33
Key Test . . . . . . . . . . . . . . . . . . . . . . . .33
Set Serial Rate . . . . . . . . . . . . . . . . . . .33
Data Capture . . . . . . . . . . . . . . . . . . . .33
Set Date/Time . . . . . . . . . . . . . . . . . . .33
Select Language . . . . . . . . . . . . . . . . . .34
Event Record . . . . . . . . . . . . . . . . . . . .34
LED Diagnostics . . . . . . . . . . . . . . . . .34
Troubleshooting Table . . . . . . . . . . . . .35
5. Replacements
Actuator Switch (330152) . . . . . .33P152
Barcode (330142) . . . . . . . . . . . .33P142
Block Probe (330340) . . . . . . . . .33P340
Central Processor Board and Application
Board (330600) . . . . . . . . . . . . . .33P600
Cooling Assembly (330300) . . .3MP300
Cooling Fan (330330) . . . . . . . . .33P330
Display Board (330800) . . . . . . .33P800
EPROM (330995) . . . . . . . . . . . .33P995
Fuse (70013/70011) . . . . . . . . . . .33P011
Keypad (330511) . . . . . . . . . . . . .33P511
NVRAM Battery (71027R) . . . .71P27R
Plunger Wire (3M0828) . . . . . .3MP825P
Power Supply (330950) . . . . . . . .33P950
Sample Handling
Assembly (330310) . . . . . . . . . . .33P310
Sample Probe (330700) . . . . . . . .33P700
Solenoid Impactor (330134) . . . .33P134
Solenoid Resistor (330135) . . . . .33P135
6. Printer User Manual
7. Schematics
PCB615 Assembly Drawing
PCB615 Schematic
PCB620 Assembly Drawing
PCB620 Schematic
3M3000 Interconnect Schematic
APPENDICES
A: Symbol Definitions
B: Product Disposal and Recycling
C: Service Log
Index
The Advanced®Osmometer Model 3300 Service Manual
Table of Contents

4
The Advanced®Osmometer Model 3300 Service Manual
Notes:

1. Introduction

7The Advanced®Osmometer Model 3300 Service Manual
Model 3300 Osmometer Specifications
Electrical:
Voltage: 100 to 130 VAC or 200 to 250 VAC
Frequency: 50 or 60 Hz
Fuses (2): 250V time delay (Type T):
1.25-Amp for 100-130 VAC,
1-Amp for 200-250 VAC
Power: 100 Watts
Memory Backup: integral lithium cell; 2 years
minimum, 10 years typical
Sample Volume: 20 µL
Sample Capacity: single sample
Readout: 2-line digital display
Units: mOsm/kg H2O
Range: 0 to 2000 mOsm/kg H2O
Linearity: Within 1% of straight line between
calibration points of 50 and 850 mOsm.
Within 1.5% above 850 mOsm.
Resolution: 1 mOsm/kg H2O
Repeatability: ±2 mOsm/kg H2O (1 S.D.)
between 0 and 400 mOsm/kg
H2O, ±0.5% (1 S.D.) between
400 and 2000 mOsm/kg H2O.
Communications: DTE EIA-232/V.24 (RS-232)
and parallel printer port and
optional barcode scanner.
Storage Temperature: -40 to +160°F
or -40 to +70°C
Operating Temperature
(ambient): 18°C to 35°C
(64°F to 95°F)
Room Humidity: 5 to 80% relative humidity;
(non-condensing)
Drift: Less than 1 digit per month plus 1 digit
for every 5°C (9°F) ambient temperature
change.
Start-up Time: 30 seconds from power on
Test Time: 60 seconds per sample
Dimensions inches centimeters
Width: 10.5 26.7
Depth: 13.5 34.3
Height: 15 38.1
Weight pounds kilograms
Net: 16 7.3
Shipping: 25 11.4
Warranty: One-year limited warranty on
workmanship and all parts except
glass, plastic and parts warranted
by their makers.
Certification:
Refer to Regulatory Notices (see page 9) for applica-
ble standards.

The Advanced®Osmometer Model 3300 Service Manual 8
General Description and Purpose
Osmometers are devices for the measurement
of the osmotic concentration of aqueous bio-
logical solutions with freezing points between
0 and -6°C. Some examples are serum, urine,
parenteral infusion solutions, laboratory con-
trol solutions and fixatives. Application
information is available upon request.
The Service Manual
This Service Manual contains:
• instructions for performing repairs.
• guides for troubleshooting operational and
mechanical problems.
• circuit system illustrations.
• information about replacement parts and
service repairs.
This manual is designed to assist
service technicians, and does not
imply a license to perform repairs
without proper qualifications.
Service Assistance
To contact Advanced Instruments Product
Service:
• Call [phone] (toll-free within the
USA and Canada; after normal business
hours, dial extension 2191)
• Call +US [phone] (elsewhere)
• Or fax [phone]
When calling Advanced Instruments, have the
model and serial number from the label on the
back of the instrument, and a description of
the problem. Use a telephone as close to the
instrument as possible in order to facilitate
making recommended diagnostic checks.
A service technician may assist in making
minor repairs over the phone, providing you
with recommended parts (or part numbers), or
may issue an authorization (RMA) to ship the
instrument for factory repair.
The RMA procedure is as follows:
1. Contact Advanced Instruments to obtain
an RMA.
2. Pack and ship the instrument in its origi-
nal carton. Do not send instrument sup-
ply items.
3. Prepay shipment to the factory. Advanced
Instruments cannot accept collect ship-
ments. Insure the shipment or accept the
damage risk.

The Advanced®Osmometer Model 3300 Service Manual
9
To reduce the risk of bodily injury,
electric shock, fire, and damage to
your instrument, please read and
observe the following precautions.
• If the product is used in a manner not in
accordance with the equipment design,
operating instructions or manufacturer's
recommendations, the operation of the
product may be impaired to the extent that
a safety hazard is created.
• Do not attempt to perform electrical work
if you are not fully qualified. This manual
is not a substitute for electrical training.
Symbol Conventions
The exclamation point within an
equilateral triangle is intended to
alert the user to the presence of
important operating and maintenance
(servicing) instructions in the litera-
ture accompanying this product.
The lightning flash with arrowhead
symbol within an equilateral triangle
is intended to alert the user to the
presence of uninsulated dangerous
voltage within the product's enclo-
sure that may be of sufficient magni-
tude to constitute risk of electric
shock to persons.
The static symbol within an equilat-
eral triangle is intended to alert the
user to the presence of internal com-
ponents that could be damaged by
static electricity.
This static symbol is intended to
alert the user to the presence of a
specific component that could be
damaged by static electricity.
This symbol indicates the presence
of alternating current (AC).
This symbol indicates the presence
of a fuse.
This symbol indicates the presence
of protective earth ground.
This symbol indicates the power is
ON.
This symbol indicates the power is
OFF.
General Cautions
• This product should be operated only with
the type of power source indicated on the
product’s electrical ratings label. Refer to
the installation instructions included with
the product.
• If the power cord provided is replaced for
any reason or if an alternate cord is used,
the cord must be approved for use in the
local country. The power cord must be
approved for the product’s listed operating
voltage and be rated at least 20% greater
than the ampere ratings marked on the
product’s electrical ratings label. The cord
end that connects to the product must have
an IEC 60320 connector.
• Plug the product into an approved ground-
ed electrical outlet.
• Do not disable the power cord’s grounding
plug.
• If an extension cord or power strip is used,
make sure that the cord or strip is rated for
the product, and that the total ampere rat-
ings of all products plugged into the exten-
sion cord or strip do not exceed 80% of the
cord’s or strip’s rating limit.
• Route power cords so that they will not be
walked on, tripped on, or pinched by items
placed upon or against them. Pay particu-
Safety / Regulatory Information

The Advanced®Osmometer Model 3300 Service Manual 10
lar attention to the plug, electrical outlet,
and the point where the cord exits the
product.
• Do not pull on cords and cables. When
unplugging cords or cables, grasp the cor-
responding connector.
• Do not install or use this product in any
area subject to extreme short-term temper-
ature variations, or locations that exceed
the specified operating environment tem-
peratures.
• Never use this product in a wet area.
• To avoid injury or fire hazard, do not oper-
ate this product in an explosive atmos-
phere.
• Do not install or use the product on an
unstable, non-level work surface.
• Do not operate this product with the covers
removed or unsecured.
Service & Maintenance Cautions
•Unplug the power cord prior to opening or
removing covers, or else you may be
exposed to electric shock, excessive tem-
peratures, or mechanical hazards.
•Performing service or maintenance not
detailed in the User’s Guide, with or with-
out this Service Manual, should only be
done by a qualified service technician.
•Never restrict airflow into or out of the
product. Occasionally, check the air vents
for blockage.
•Wipe the exterior of the product with a
soft, damp cloth as needed. Using cleaning
products other than those specified, may
discolor or damage the finish.
•If the product requires service for any of
the following reasons, unplug the product
from the electrical outlet and refer service
to a qualified service technician.
- The power cord, extension cord, power
strip or power input module is damaged.
-Liquid has been spilled into the interior
of the product.
-A foreign object has fallen into the
product.
-The product has been dropped or dam-
aged by a falling object.
-There are noticeable signs of overheat-
ing or a burning odor.
-The product does not operate normally
when you follow the operating proce-
dures.
-The main supply fuse(s) or any internal
fuse(s) continually fail.
•A discharge of static electricity from con-
tact with the human body or other conduc-
tor may damage system boards or static
sensitive devices. Never perform internal
maintenance without following recom-
mended static protection procedures.
• The product is equipped with operator
accessible fuses. If a fuse blows, it may be
due to a power surge or failure of a com-
ponent. Replace the fuse only once. If the
fuse blows a second time, it is probably
caused by failure of a component part. If
this occurs, refer service to qualified serv-
ice personnel. Always replace the fuse
with one of the same rating, voltage, and
type. Never replace the fuse with one of a
higher current rating.
• When servicing the product, use only fac-
tory-specified parts.
• WARNING: When returning this product
for service, or shipping this product to a
second location, remove all hazardous
specimens and decontaminate the product
before packaging for shipment. If the
product cannot be decontaminated, consult
with your shipping agent on appropriate
packaging and marking.

The Advanced®Osmometer Model 3300 Service Manual
11
Hazardous Material Cautions
• WARNING: Handle all biohazardous mate-
rials according to established good laborato-
ry practices and follow your institution’s
exposure control plan. Persons handling
human blood and body fluid samples must
be trained in blood-borne hazards and
observe universal precautions. Universal pre-
cautions is an approach to infection control,
where all human blood and body fluids are
treated as if known to be infectious. Use per-
sonal protective equipment such as gloves,
gowns, etc., to prevent exposure. Store bio-
hazardous materials in regulated waste con-
tainers and dispose of these materials in a
safe and acceptable manner that is in com-
pliance with all country, state and local
requirements.
•If a biohazardous material is spilled on or
inside the equipment, decontaminate the
equipment using a 1% bleach solution, or as
outlined by those policies and procedures
established within your institution.
•To avoid injury or fire hazard, do not operate
this product in an explosive atmosphere.
Regulatory Notices
•This product has been designed and manu-
factured in accordance with U.S., Canadian,
and European regulatory requirements as
outlined below. Modifications made to this
product that are not expressly approved in
writing by the manufacturer will void the
user’s authority to operate this product, pre-
viously issued factory approvals, and the
user’s rights under the warranty.
•The distributor or dealer may have applied
additional local, national, or international
approvals to this product. Consult the dis-
tributor or dealer for more information and
documentation.
•Connections to this product must be made
with shielded cables. Use of non-shielded
cables may violate RFI/EMI limits.
U.S. Safety This product has been listed by
ETL testing laboratories as being
in compliance with the require-
ments of UL 3101-1, 1st Edition,
"Electrical Equipment for
Laboratory Use; Part 1: General
Requirements". The "US" in the
lower right of the ETL mark
demonstrates this listing.
Canadian Safety This product has been listed by
ETL testing laboratories as being
in compliance with the require-
ments of CAN/CSA C22.2
No.1010.1-92, "Safety
Requirements for Electrical
Equipment for Measurement,
Control and Laboratory Use;
General Requirements";
Including Amendment Two. The
"C" in the lower left of the ETL
mark demonstrates this listing.
EC Declaration of This product meets the intent of
Conformity - EMC Directive 89/336/EEC for
Electromagnetic Compatibility.
Compliance was demonstrated
using the following standards, as
listed in the Official Journal of
the European Communities:
Consult the Declaration of Con-
formance certificate shipped with
the product for the latest update.
• EN 61326: 1998, Group 1,
Class B, "Electrical Equipment
for Measurement, Control, and
Laboratory Use".
EC Declaration of: This product meets the intent of
Conformity - Low Directive 73/23/EEC, the Low
Voltage Voltage Directive. Compliance
was demonstrated using the fol-
lowing standards as listed in the
Official Journal of the European
Communities: Consult the
Declaration of Conformance cer-
tificate shipped with the product
(if required) for the latest update.
·EN 61010-1 (1993), "Safety
Requirements for Electrical
Equipment for Measurement,
Control and Laboratory Use -
General Requirements";
Including Amendment Two
(1995).
Regulatory
approval type Description

The Advanced®Osmometer Model 3300 Service Manual 12
Regulatory Marks
This symbol indicates conformity to
relevant European directives.
This symbol indicates the product
was tested to conform to relevant
Canadian and U.S. safety standards
by Intertek Testing Services NA,
Inc. The ETL mark is approved in
the United States as a Nationally
Recognized Testing Lab (NRTL) by
OSHA, and in Canada by the
Standards Council of Canada.
Regulatory
approval type Description
EC Declaration of This product meets the intent of
Conformity - WEEE Directive 2002/96/EC as amended
by 2003/108/EC for Waste
Electrical and Electronic
Equipment (WEEE). Consult the
Declaration of Conformance cer-
tificate shipped with the product
(if required) for the latest update.

2. General Overview

The Advanced®Osmometer Model 3300 Service Manual
15
General Overview
A. Keypad
B. Instrument Foot
C. Cooling Fan
D. Keypad Display Board
E. Display Harness Assembly
F. PCB Set
G. Power Supply
A
B
D
C
F
G
H
E
L
IM
K
J
H. Sample Handling Assembly
I. DC Harness
J. Printer Cable Assembly
K. RS-232 Assembly
L. Barcode Assembly
M. Power Entry Assembly

The Advanced®Osmometer Model 3300 Service Manual 16
Notes:

17
The 3300 is comprised of the following func-
tional blocks:
Power Supply - Part No. 330950
The power entry assembly interfaces the AC
voltage presented to the instrument with the
power supply. The power supply provides
+15VDC to the main printed circuit board.
The fan and thermoelectric operate at
+15VDC. The solenoid operates at +12VDC.
Keypad - Part No. 330511
The keypad provides a two button interface
between the user and the instrument. The sec-
ond line of the display is used to indicate the
function of each key. The software changes
the button description on the second line of
the display.
Front End
The sample thermistor measures the tempera-
ture of the sample. The thermoelectrics
(whose duty cycle is controlled through the
block probe/thermistor) supercool the sample.
When the supercooled sample reaches a set
temperature (3200 mOsm), the impactor acti-
vates, causing the sample to freeze. The fan
runs as required to maintain the software con-
trolled target temperatures.
Instrument Software Update
Your instrument software contained in two
flash EPROMs on the main processor board
may be updated via the RS-232 port. Such
software updates are made available as new
features and other improvements are added
during the life cycle of the instrument. For
information on the availability of software
updates contact Advanced Instruments, Inc. or
an authorized distributor. For directions on
performing the RS-232 port software upgrade
consult the documentation supplied with the
upgrade package.
330600 Control Board Set Description
General: The control board set is made up of
two printed circuit boards in a motherboard/
daughterboard configuration.
Systems Overview
Processor
Board
Serial Port Applications
Board Cooling System
Power
Supply
Printer
Port
KeypadDisplay
Barcode
Port
The Advanced®Osmometer Model 3300 Service Manual

The Advanced®Osmometer Model 3300 Service Manual 18
330620 Processor Board
Processor: The processor used is an Intel
80C186 16-bit embedded processor. The
80C186 contains three programmable 16-bit
timers, two serial ports, programmable inter-
rupts, 1 mega-byte of memory address space,
and 64 kilo-bytes of input/output (I/O)
address space. The processor uses an external
32 MHz crystal to generate the internal 16
MHz system clock. The processor controls
access to all memory and all I/O.
Memory Map: The 1 mega-byte of memory
address space contains read-only memory
(Flash EPROM), read/write memory (static
RAM), and the real time clock. About half of
the address space is unused, allowing for
future expansion. The read-only memory is
divided into four sections: reset vector, boot
code, parameter blocks (unused), and appli-
caiton code. The reset vector tells the proces-
sor where to first start executing code; in this
case, the boot code is executed first after
reset. The boot code determines if new soft-
ware will be downloaded by checking if the
dip switch is in the “PROGRAM” position.
If it is, the boot code waits for new software
to be downloaded through the serial port. If
not, the application code starts.
The real time clock maintains the current date
and time, and contains nonvolatile memory
where the instrument’s operation parameters
are stored. A internal lithium battery pre-
serves the contents of the nonvolatile memory
when the instrument is turned off. Finally, the
read-write memory is used for stacks, vari-
ables, etc., except for the small section allo-
cated for the interrupt vectors. The interrupt
vectors tell the processor what code to run
when an interrupt occurs, and functions simi-
larly to the reset vector.
Please note that all memory addresses and
sizes are always defined in terms of bytes,
even though the processor handles words (1
word = 2 bytes, 1 byte = 8 bits; therefore, 16
bits = 1 word).
Input/Output Map: The 64 kilo-bytes of
I/O address space control access to all periph-
erals such as the serial ports, application
board, etc. The processor uses 256 bytes,
called the Peripheral Control Block, to control
the integrated serial ports, timers, interrupts,
chip selects, and I/O pins. The Peripheral
Control Block is fully described in the
80C186EB/80C188EB Microprocessor User’s
Manual. The application board’s registers and
the CPU board’s registers control access to
various functions and are described later.
Memory: Two types of memory are avail-
able: read-only and read/write. The chips
used here have 8-bit wide data buses. Used in
pairs, the memory becomes compatible with
the processor’s 16-bit wide data bus. The
read-only memory is implemented using two
128 kilo-bytes x 8 bits Flash EPROMs. Flash
memory is only programmable when a pro-
gramming voltage (in this case, 12 volts DC)
is applied to the memory; otherwise, it
behaves like read-only memory. The boot
code controls the programming voltage, since
this is the only place where new software can
be downloaded. The read/write memory is
implemented using two 128 kilo-bytes x 8
bits static RAMs.
Watchdog Timer: The watchdog timer pro-
vides a mechanism to reset the processor
when the software is not behaving normally.
The software “pets” the watchdog every 100 -
200 milliseconds. As long as the watchdog is
“petted”, nothing happens. However, if the
software stops “petting” the watchdog, the
watchdog “bites” the processor by activating
the processor’s RESET pin, causing the
processor to reset. The watchdog will also
reset the processor if the power supply falls
below 4.75 VDC. These two features allow
the instrument to recover from abnormal soft-
ware and hardware conditions.
Real Time Clock (RTC): The real time
clock maintains the current date and time.
The RTC uses an internal clock circuit with
an internal, 10-year life, lithium battery to

The Advanced®Osmometer Model 3300 Service Manual
19
perform timekeeping. The battery also pre-
serves the contents of internal memory.
Dip Switch: The three-position dip switch
allows the user to download new software via
one switch. The other two switches are avail-
able for selecting different operating modes.
These operating modes and the process for
downloading software are described later in
this manual.
Voltages: Three voltages are present on the
CPU board: +5 VDC, +12 VDC, and VPP.
+5 VDC powers all the logic. +12 VDC is
switched on and off to create the flash memo-
ry’s programming voltage, VPP.
Glue Logic: The glue logic performs the
functions of creating the RAM memory chip
selects, the Flash memory write signals, the
VPP control signal, the watchdog control sig-
nal, and accessing the dip switch. The CPU
board has two software accessible hardware
registers to read the dip switch and to control
watchdog and VPP.
Connectors: A 64-pin connector provides
address, data and interrupt signals. A 16-pin
connector provides general chip selects and
serial receive/transmit signals. The applica-
tion PCB uses a subset of the available sig-
nals.
330615 Application Board
The application PCB contains all circuitry
specific to the 3300 instrument. The board
includes voltage supplies, indicators, analog-
to-digital converters, drive circuitry, parallel
ports, serial ports, and various switches.
Analog-to-Digital Converters: Two analog-
to-digital converters are provided; one for the
sample thermistor probe, and one for the
block thermistor probe. The thermistors vary
in resistance from approximately 2 kilo-ohms
at room temperature, to approximately 10
kilo-ohms at -12ºC. Typically, a 0.6 ohm
change in the thermistor’s resistance equates
to a 1 mOsm/1.86mºC change. A separate
Wheatstone bridge circuit is used to measure
the voltage across each thermistor probe.
This voltage is first filtered and then sampled
by the analog-to-digital converter. The ana-
log-to-digital converter uses a sigma-delta
conversion technique with on-chip filtering
and a 6.25 VDC reference voltage.
Drive Circuitry: Drive circuitry is provided
to turn on and off the three high current loads
such as the impactor, the thermoelectric cool-
er, and the fan.
The thermoelectric cooler is controlled by a
FET driver transistor. The FET is, in turn,
controlled by the microprocessor through the
PLD application logic. The processor varies
the duty cycle square wave in response to
software commands and block probe resist-
ance.
The impactor and fan are controlled by FET
transistors on the application board, that are
interfaced to the processor through the appli-
cation logic.
I/O Ports: Circuitry for the two serial ports
(RS-232 and barcode) and the parallel printer
port, is present on the application board with
cabling to the actual connectors on the back
panel.
Display: The display is interfaced to the
processor via a programmable logic device
(PLD). The application logic, in response to
processor commands, controls the information
located on the display.
Light Emitting Diodes (LED): LEDs are
provided to indicate when a high current load
is active, or a voltage supply is active. Green
LEDs are used on the power supply voltages,
yellow LEDs are used on driver signals such
as the fan impactor and thermoelectric con-
trols.

The Advanced®Osmometer Model 3300 Service Manual 20
Application Logic: The application logic is
made up mainly of two programmable logic
devices (PLDs). These provide software
accessible hardware registers, enabling the
software to read the keypad, sensors, and ana-
log-to-digital converters. These also allow
manipulation of the display, external compo-
nents such as the fan, impactor, etc., and
interface to the RS-232 ports. The printer is
controlled directly from the microprocessor
through an 8-pin D-latch.
Connectors: Connectors are supplied for the
CPU PCB, display, keypad, power, drives,
probes, and back panel I/O ports.
Printer Power Outlet: A printer power out-
let eliminates the need for a wall transformer
with an external printer. The 3-pin DIN sock-
et, located on the back of the instrument, sup-
plies up to 1 Amp at 15 VDC via the follow-
ing connections:
Pin 1 (left) +15 VDC
Pin 2 (center) not connected
Pin 3 (right) ground
Printer Port: The printer port connector on
the back of the instrument provides 8 data
lines and the necessary handshaking signals
for communication with most standard print-
ers using standard IEEE-1284.
Serial (RS-232) Port Interface: An RS-232
line driver/receiver provides the microproces-
sor with a serial port interface that supports
both hardware and software handshaking.
The DB-9 RS-232 port conforms to the DTE
RS-232C standard and has the following pin
assignments:
Signal Pin Direction
Carrier Detect 1 to 3300
Receive Data 2 to 3300
Transmit Data 3 from 3300
Data Terminal Ready 4 from 3300
Signal Ground 5 common
Data Set Ready 6 to 3300
Request to Send 7 from 3300
Clear to Send 8 to 3300
Note that your instrument is only designed to
support unidirectional communication with an
external device. At this time, there is no pro-
tocol for bidirectional communication.
For a sample RS-232 Port Setup, please see
the RS-232 Supplemental Information in the
Appendix at the end of this user’s guide.
Note: This instrument requires the use of a
null modem RS-232C cable. There are
several variations on null modem
cables. Advanced Instruments recom-
mends that you purchase a RS-232C
cable direct from our factory.
Supervisor/Operator Keyswitch Interface:
A PLD is used to interface the supervisor/
operator keyswitch to the microprocessor. In
Operator position, the user cannot change
setup or calibration settings.
Barcode Port*: A D-type, 15-pin barcode
port is provided in the back of the 3300 for
connecting and providing power to such a
device. For proper operation, the barcode port
requires a 1200 bps, RS-232 signal providing
asynchronous serial data containing 1 start
bit, 8 data bits, 1 stop bit, and no parity.
*3300 instruments prior to suffix E have no
barcode port. 3300 instruments suffix E-J
may have a barcode port available as an
option. 3300 instrument suffix K and later
include the barcode port as standard equip-
ment.
+5V DC 1 to reader
receive data 10 from reader
gnd/earth 9 common
Signal Pin Direction
Barcode Port Connections