Agilent Technologies RS-232 User manual

DRAFT
vacuum technologies
RS-232 and RS-485
Options for the
senTorr™ Gauge
Controller
Manual No.699908170
Revision B
May 2004
INSTRUCTION MANUAL

DRAFT
Copyright 2004
Vacuum Technologies
RS-232 and RS-485 Options for the senTorr
Gauge Controller

RS-232 and RS-485 Options for the senTorr Gauge Controller
DRAFT
iii
Warranty
Products manufactured by Seller are warranted against defects in materials and workmanship for twelve
(12) months from date of shipment thereof to Customer, and Seller’s liability under valid warranty
claims is limited, at the option of Seller, to repair, to replace, or refund of an equitable portion of the
purchase price of the Product. Items expendable in normal use are not covered by this warranty. All
warranty replacement or repair of parts shall be limited to equipment malfunctions which, in the sole
opinion of Seller, are due or traceable to defects in original materials or workmanship. All obligations of
Seller under this warranty shall cease in the event of abuse, accident, alteration, misuse, or neglect of
the equipment. In-warranty repaired or replaced parts are warranted only for the remaining unexpired
portion of the original warranty period applicable to the repaired or replaced parts. After expiration of
the applicable warranty period, Customer shall be charged at the then current prices for parts, labor,
and transportation.
Reasonable care must be used to avoid hazards. Seller expressly disclaims responsibility for loss or
damage caused by use of its Products other than in accordance with proper operating procedures.
Except as stated herein, Seller makes no warranty, express or implied (either in fact or by operation of
law), statutory or otherwise; and, except as stated herein, Seller shall have no liability under any war-
ranty, express or implied (either in fact or by operation of law), statutory or otherwise. Statements made
by any person, including representatives of Seller, which are inconsistent or in conflict with the terms of
this warranty shall not be binding upon Seller unless reduced to writing and approved by an officer of
Seller.
Warranty Replacement and Adjustment
All claims under warranty must be made promptly after occurrence of circumstances giving rise thereto,
and must be received within the applicable warranty period by Seller or its authorized representative.
Such claims should include the Product serial number, the date of shipment, and a full description of
the circumstances giving rise to the claim. Before any Products are returned for repair and/or adjust-
ment, written authorization from Seller or its authorized representative for the return and instructions as
to how and where these Products should be returned must be obtained. Any Product returned to Seller
for examination shall be prepaid via the means of transportation indicated as acceptable by Seller.
Seller reserves the right to reject any warranty claim not promptly reported and any warranty claim on
any item that has been altered or has been returned by non-acceptable means of transportation. When
any Product is returned for examination and inspection, or for any other reason, Customer shall be
responsible for all damage resulting from improper packing or handling, and for loss in transit, notwith-
standing any defect or non-conformity in the Product. In all cases, Seller has the sole responsibility for
determining the cause and nature of failure, and Seller’s determination with regard thereto shall be
final.
If it is found that Seller’s Product has been returned without cause and is still serviceable, Customer will
be notified and the Product returned at Customer’s expense; in addition, a charge for testing and exam-
ination may be made on Products so returned.
3/1/00

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RS-232 and RS-485 Options for the senTorr Gauge Controller
v
Contents
Preface ............................................................................................................................................ xii
Hazard and Safety Information .................................................................................................... xii
EMC Warnings ........................................................................................................................... xiii
EN 55022 Class A Warning .................................................................................................. xiii
FCC ...................................................................................................................................... xiii
RS-232 and RS-485 Options ......................................................................................................... 1-1
Board Configurations .................................................................................................................. 1-1
RS–232 standard version....................................................................................................... 1-1
RS–485 ................................................................................................................................. 1-1
Installation .................................................................................................................................. 1-2
Operation ................................................................................................................................... 1-6
Setting Baud Rate and Address .............................................................................................. 1-6
Command Syntax and Definitions ......................................................................................... 1-7
Request for Return Health and Safety Certification
Sales and Service Offices

RS-232 and RS-485 Options for the senTorr Gauge Controller
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RS-232 and RS-485 Options for the senTorr Gauge Controller
vii
List of Figures
Figure Caption Page
1-1 Installing the Serial Communication Board .......................................................................... 1-2
1-2 Pin Connections................................................................................................................... 1-5

RS-232 and RS-485 Options for the senTorr Gauge Controller
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RS-232 and RS-485 Options for the senTorr Gauge Controller
ix
List of Tables
Table Title Page
1-1 Gauge Configuration Key Entries.......................................................................................... 1-1
1-2 RS–485 Selection ................................................................................................................. 1-3
1-3 RS–485 Terminating Resistance Selection ............................................................................ 1-3
1-4 RS–232 Signal Communications ..........................................................................................1-4
1-5 RS–232 Null Modem or Standard Selection ......................................................................... 1-4
1-6 RS–485 Signal Connections for Daisy Chaining ................................................................... 1-5
1-7 Setpoint Numbering............................................................................................................. 1-7
1-8 Serial Command Set ............................................................................................................ 1-8

RS-232 and RS-485 Options for the senTorr Gauge Controller
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Varian, Inc.
declare under our sole responsibility that the product,
erklären, in alleniniger Verantwortung, daß dieses Produkt,
déclarons sous notre seule responsabilité que le produit,
declaramos, bajo nuestra sola responsabilidad, que el producto,
verklaren onder onze verantwoordelijkheid, dat het product,
dichiariamo sotto nostra unica responsabilità, che il prodotto,
Declaration of Conformity
Konformitätserklärung
Déclaration de Conformité
Declaración de Conformidad
Verklaring de Overeenstemming
Dichiarazione di Conformità
to which this declaration relates is in conformity with the following standard(s) or other normative documents.
auf das sich diese Erklärung bezieht, mit der/den flogenden Norm(en) oder Richtlinie(n) übereinstimmt.
auquel se réfère cette déclaration est conforme à la (auz) norme(s) ou au(x) document(s) normatif(s).
al que se refiere esta declaración es conforme a la(s) norma(s) u otro(s) documento(s) normativo(s).
waamaar deze verklaring verwijst, aan de volende norm(en) of richtlijn(en) beantwoodt.
a cui se rifersce questa dichiarazione è conforme alla/e sequente/I norma/o documento/I normativo/i.
Frederick C. Campbell
Operations Manager
Vacuum Technologies
We
Wir
Nous
Nosotros
Wij
Noi
Lexington, MA, 02421-3133 USA
121 Hartwell Avenue
Vacuum Technologies
Lexington, Massachusetts, USA
Varian, Inc.
RS-232 and RS-485 Options for the senTorr Gauge Controller
EN 55011
1991 . . . . . . . . . . . . . . . . . . . . . . . . Group 1 Class A ISM emission requirements
EN 61010-1
1993 . . . . . . . . . . . . . . . . . . . . . . . . Safety requirements for electrical equipment for measurement, control, and
laboratory use incorporating Amendments Nos 1 and 2.
EN 50082-2
1995 . . . . . . . . . . . . . . . . . . . . . . . . EMC heavy industrial generic immunity standard
October 2003

RS-232 and RS-485 Options for the senTorr Gauge Controller
xii
DRAFT
Preface
Hazard and Safety Information
This manual uses the following standard safety protocols:
WARNING The warning messages are for attracting the attention of the
operator to a particular procedure or practice which, if not
followed correctly, could lead to serious injury.
CAUTION The caution messages are displayed before procedures, which
if not followed, could cause damage to the equipment.
NOTE The notes contain important information.
This product must only be operated and maintained by trained personnel.
Before operating or servicing equipment, read and thoroughly understand all operation/
maintenance manuals provided by Vacuum Technologies. Be aware of the hazards
associated with this equipment, know how to recognize potentially hazardous conditions,
and how to avoid them. Read carefully and strictly observe all cautions and warnings. The
consequences of unskilled, improper, or careless operation of the equipment can be serious.
In addition, consult local, state, and national agencies regarding specific requirements and
regulations. Address any safety, operation, and/or maintenance questions to your nearest
Vacuum Technologies office.

RS-232 and RS-485 Options for the senTorr Gauge Controller
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xiii
EMC Warnings
EN 55022 Class A Warning
This is a Class A product. In a domestic environment this product may cause radio
interference which the user may be required to take adequate measures to alleviate.
FCC
This device complies with Part 15 of the FCC rules. Operation is subject to the following
two conditions: (1) This device may not cause harmful interference, and (2) this device must
accept any interference received, including interference that may cause undesirable
operation.
NOTE The equipment has been tested and found to comply with the
limits for a Class A digital device, pursuant to Part 15 of the FCC
rules. These limits are designed to provide reasonable
protection against harmful interference when the equipment is
operated in a commercial environment. This equipment
generates, uses, and can radiate radio frequency energy and, if
not installed and used in accordance with the instruction
manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential
area is also likely to cause harmful radio communications
interference in which case the user will be required to correct
the interference at his own expense.
Contacting Vacuum Technologies
In the United States, you can contact Vacuum Technologies Customer Service at
1-800-8VARIAN.
Internet users:
❑Send email to Customer Service & Technical Support at
[e-mail]
❑Visit our web site at www.varianinc.com/vacuum
❑Order on line at www.evarian.com
See the back cover of this manual for a listing of our sales and service offices.

RS-232 and RS-485 Options for the senTorr Gauge Controller
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RS-232 and RS-485 Options for the senTorr Gauge Controller
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1-1
RS-232 and RS-485 Options
The senTorr serial communication board is available in the following configurations:
❑RS–232 standard with a 9-pin D-subminiature connector (Part number L6439-301)
❑RS–485 (Part number L8940-301)
The last digit of the senTorr key entry determines the communication options installed
(Table 1-1).
Board Configurations
This section discusses board configuration and capabilities.
RS–232 standard version
All of the keypad functions, except for the baud rate settings and the display output, are
accessible through the RS–232 bidirectional computer link.
The standard RS–232 board contains a DIP switch that reverses the pin-outs of the RTS/CTS
and TXD/RXD pairs. This built-in, null modem capability is used to simplify the cable
connection to the host system.
The senTorr outputs +9 V for an asserted (logic 0) level, and −9 V for an unasserted (logic 1)
level. The input signals to senTorr must be between +2.4 V and +30 V for an asserted level
and +8 V and -30 V for an unasserted level.
Maximum cable length is 50’ (15.24 m).
RS–485
The RS–485 board employs differential line drivers and receivers capable of communicating
with up to 32 senTorr units, at distances of up to 4000’ (1219.2 m) at 19,200 baud in a
multidrop scheme. The network arrangement allows any unit to go offline without affecting
the operation of the other units. A shielded, twisted pair cable provides good resistance to
electrical noise. The cable multiplexes transmit and receive signals on one pair, leaving the
other pair available for RTS. The factory setting is for RS–485.
Table 1-1 Gauge Configuration Key Entries
Configuration Key Entry
No Communications 0
RS-232 1
RS-485 4

RS-232 and RS-485 Options for the senTorr Gauge Controller
1-2
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Installation
NOTE Do not use the EPROM supplied when purchasing the RS–485
Board (Part No. L8940-3010)as it is used in the Multi-Gauge
Controller only.
Add a 100 Ohm resistor in series from the senTorr serial port
ground pin to the system ground to help break ground loops.
To configure and install the board:
1. Ensure that the line cord is unplugged.
2. Open the unit by removing the two screws at the top rear of the unit, pivot the cover up
and back to disengage the front lip, and lift off the cover.
3. Remove the blank plastic cover from the rear panel (Figure 1-1).
Save the two small screws for attaching the cover plate with the cable opening.
Figure 1-1 Installing the Serial Communication Board

RS-232 and RS-485 Options for the senTorr Gauge Controller
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1-3
4. Set the DIP switches as per board type, as discussed below:
❑RS–485
Refer to Table 1-2. If the senTorr is shipped with this option installed, the board is
configured as ordered.
A differential terminating resistance of 220 Ohms can be switched into the two-wire
pairs. The factory setting is unterminated (Table 1-3).
Table 1-2 RS–485 Selection
Switch Number RS–485
SW1-1 closed
SW1-2 open
SW1-7 closed
SW1-8 open
Table 1-3 RS–485 Terminating Resistance Selection
Switch Number
Number Terminating
Resistance
220 Ohm Terminating
Resistance
SW1-3 open closed
SW1-4 open closed

RS-232 and RS-485 Options for the senTorr Gauge Controller
1-4
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❑RS–232 Standard
Table 1-4 lists the serial port pin-outs of the standard 9-pin connector for both
standard and null modem operation. Table 1-5 lists DIP switch SW1 settings to select
the signal output mode. The factory setting is for the null modem mode.
Table 1-4 RS–232 Signal Communications
Signal Null Modem Pin Standard Pin Description
Gnd 5 5 Signal Ground
TXD 3 2 Transmitted Data
RXD 2 3 Received Data
RTS 8 7 Request To Send
CTS 7 8 Clear To Send
DTR 4 4 Data Terminal Ready
Table 1-5 RS–232 Null Modem or Standard Selection
Switch Number Null Modem Setting Standard Setting
SW1-1 closed open
SW1-2 open closed
SW1-3 closed open
SW1-4 open closed
SW1-5 closed open
SW1-6 open closed
SW1-7 closed open
SW1-8 open closed

RS-232 and RS-485 Options for the senTorr Gauge Controller
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1-5
5. Plug the serial communication board into its connector J3.
Ensure that the board connectors are properly aligned and that the cable connection is
at the rear of the unit.
6. Attach the cover plate using the two small screws.
7. Replace the cover and secure it with the two screws.
NOTE Vacuum Technologies cannot guarantee compliance with FCC
regulations for radiated emissions unless all external wiring is
shielded.
There are two shielded mini–DIN connectors to facilitate
connections to the rest of the network. These are in parallel and
permit easy daisy–chaining of multiple units. The connections
are listed in Table 1-6 and are shown in Figure 1-2.
Figure 1-2 Pin Connections
Table 1-6 RS–485 Signal Connections for Daisy Chaining
Pin Number RS–485 Wire Color*
1GndGreen
2GndBlack
3RTS–Brown
4 XCV + Red
5 RTS + White
6 XCV – Blue
* These colors are pre-made cinch cable type MDC-6Pxx.

RS-232 and RS-485 Options for the senTorr Gauge Controller
1-6
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Operation
The user application must conform to the software protocol as specified (refer to
“Command Syntax and Definitions” on page 7). The senTorr's baud rate and address are
programmed through the front panel keypad. For successful operation, all units on the
network must be at the same baud rate and, to avoid contention, have different addresses.
All units are shipped from the factory with a default address of 00.
Upon receipt of a command, senTorr holds its RTS line to logic 1 (unasserted) while it
processes the command and returns any required data. If the host does not monitor its CTS
line (as in RS–485), it must limit the frequency of commands as follows.
❑The host must allow 500 mseconds after sending an emission or degas on/off
command. Any bytes sent during that time overwrite each other.
❑If a response is expected, the host waits to receive the response before starting the
next command.
While senTorr tolerates high speed communications, the application does not tie up senTorr
with incessant strings of commands so it can process pressure data from the gauge channels.
Setting Baud Rate and Address
The BAUD RATE key is used to display and set the serial communications baud rate, parity,
and the controller address (for use in a multi-drop communication link).
To set the baud rate and address:
1. Press BAUD RATE.
The IG display mantissa flashes the present baud rate.
2. Use the up/down arrows to select the desired baud rate:
1.2 (1200), 2.4 (2400), 4.8 (4800), 9.6 (9600), or 19.2 (19,200).
3. Press ENTER to save the baud rate setting and to advance to the parity setting display in
the IG exponent.
4. Use the arrow keys to select no (n), even (E), or odd (0)parity.
5. Press ENTER to save the parity setting.
The controller address setting flashes in the IG mantissa.