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PRESSURE GAUGE CONTROLLER MODELS PGC4S, PGC4D AND PGC4Q.
The information contained in this manual has been carefully checked and is believed to be correct. No
responsibility is assumed for any errors. User comment and criticism is welcome: please write quoting
the serial number of the instrument and the version number of the software as displayed by the
instrument to:
Please direct other enquiries to the distributor or agent from whom you purchased the instrument.
ARUN MICROELECTRONICS LTD.
INTERFACE MANUAL ISSUE 4
For use with Program Version 2.00 onward.
COPYRIGHT RESERVED 1993
Customer Services,
Arun Microelectronics Ltd.,
Fitzalan Road,
ARUNDEL,
West Sussex. BN18 9JP.
England.
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Summary of Contents for Arun Microelectronics PGC4S
- Page 1 ARUN MICROELECTRONICS LTD. PRESSURE GAUGE CONTROLLER MODELS PGC4S, PGC4D AND PGC4Q. INTERFACE MANUAL ISSUE 4 For use with Program Version 2.00 onward. COPYRIGHT RESERVED 1993 The information contained in this manual has been carefully checked and is believed to be correct. No responsibility is assumed for any errors.
- Page 2 CONTENTS 1. GENERAL DESCRIPTION. 2. HARDWARE. 2:1 PGC4 Line Drivers and receivers. 2:2 Converting from RS232 to RS485/RS422. 2:3 Setting the interface parameters. 2:4 Cable construction and installation. 2:5 Host computer line drivers and receivers. 2:6 Demonstration software. 3. INTERFACE PROTOCOL. 3:1 General Command and Response formats.
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Page 3: General Description
RS422, since the drivers and receivers are connected to separate balanced lines (i.e. no transceivers are used). PGC4S, PGC4D and PGC4Q instruments can be mixed on the same line. Each instrument is identified by a unique address code, selected from the numbers 0 to 15 inclusive and defined by internal links. - Page 4 The type of line drivers selected will depend on the distance between the host computer and the most remote PGC4, the number of PGC4s sharing the same interface lines and the speed of response desired. The speed of response will normally be dominated by the transmission times, the latency of the PGC4 and host program should be small in comparison.
- Page 5 avoid touching the pins. Insert the pins of the interface PCB into the U24 socket with the overhanging part toward the rear of the instrument. Take care to engage all the pins correctly in the socket. The pins are brittle and will break if bent. Insert the integrated circuit previously removed into the socket on the interface PCB, aligning the notch with the notch shown on the PCB legend.
- Page 6 If facilities exist for terminating lines at the receiver this should be done. For compliance with RS485 the line driver should also be terminated. Consideration should be given to the receiver output state when the all the PGC4s are silent and their lines are in the "TRI-STATE" condition.
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Page 7: Interface Protocol
3. INTERFACE PROTOCOL. Up to sixteen instruments can be connected to a single RS232 or RS422/RS485 party line. Instruments of different types can be connected on the same line, but all instruments must have their internal links set to (a) the same baud rate (b) a unique instrument address Each instrument maintains its transmit line in a high-impedance state except when transmitting data in response to a request from the host computer. - Page 8 13, 10). If a status report was requested the status and error bytes are followed by the report, a checksum and then the CR-LF. Instrument status byte coding: Status byte: Bits 3-0 : Instrument type 0001 - PGC4S 0010 - PGC4D 0011 - PGC4Q 0110...
- Page 9 3:4 Host Computer Command Format. Gauges within the instrument are addressed by a numeric character, found from the status report. For example, in a PGC4D instrument the two cold-cathode gauges are numbered '1' and '2', the two pirani gauges '3' and '4' and the capacitance manometer gauge, if fitted, by '5'. 'X' may be used where applicable to address all gauges within the instrument.
- Page 10 Name Char Parameters Description <gas factor> Instr Gauge Set pirani gauge gas factor, range 1.0E+00 to 9.9E+00 SN Value <bakeout> Instr Start bakeout using gauge 1 and current bakeout overpressure, temperature and time. Can be cancelled before end of the cycle by the <gauge off> command. (PGC6 only).
- Page 11 3:5 Status reports. There are three types of status report. The short status report gives the operating status and pressure of each gauge in the instrument. The single gauge report does the same for a specified gauge. The long status report lists the configuration of each gauge, each relay and the instrument. The information given by the long status report only needs to be read once after taking control of an instrument;...
- Page 12 Then, for each gauge in the instrument, a gauge record: Byte Name Details Header byte Gauge type 'C' : cold-cathode 'I' : Bayard-Alpert 'P' : Pirani 'M' : capacitance manometer 'T' : trigger Penning Gauge number '1' ... Gauge status Bit 6: always set to 1 Bit 5: gauge externally inhibited Bit 3: gauge in degas...
- Page 13 3:5.2 Single Gauge Status Report Format. A single gauge status report consists of the 4 status, error and relay status characters followed by one gauge record as per the short status report, a checksum and a CR-LF. 3:5.3 Long Status Report Format. Status byte.
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Page 14: Appendix A. Format For Downloading Cold-Cathode Gauge Calibration Tables
System configuration record: Byte Name Details Header byte Pirani 1 interlock '0' : disabled '1' : enabled Relay configuration '0' :relay de-energised when gauge is off '1' : relay is energised Instrument default cold- '0' : AML cathode gauge type '1' : Balzers '2' : ESRF '3' : To be defined... -
Page 15: Appendix B. Example Of A Host/Pgc4 Dialogue
Appendix B. Example of a host/PGC4 dialogue. Source ASCII Description Host 2A 50 35 Host polls instrument 5 Instr 5 23 40 PGC4Q under local control Host 2A 50 31 Host polls instrument 1 Instr 1 31 41 PGC4 under host control, Gauge-specific error occurred Host 2A 53 31 Host requests short report... -
Page 16: Appendix C. Remote Connector
Appendix C. Remote connector. This is a 9 way "D" type male connector. Used pin connections and signal names for RS232 are: 3 Received Data 2 Transmitted data 5 Signal ground If option F is present (as indicated by the suffix F in the model number on the rear panel) then the pin connections and signal names are compatible with RS422 or RS485 as follow: 6Received data + 7Received data -...
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