INFICON PSG55x ATM to Medium Vacuum Gauge (RS232C / RS485C) - Manual (Page 2)

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tira59e1 (2010-07) RS232C.cp
The Serial Interface allows the communication of the digital INFICON Pirani
Capacitance Diaphragm Gauges (PCG550, PCG552, PCG554) and the digital
INFICON Pirani Standard Gauges (PSG550, PSG552, PSG554) with
• an INFICON Vacuum Gauge Controller (VGC series) or with
• another appropriate controller.
The RS232C or RS485C interface integrated in the gauge allows to digitally trans-
mit measurement values and information on the gauge status as well as to make
parameter settings.
Caution
Caution: data transmission errors
Any attempt to simultaneously operate the gauge via the Serial
Interface and a fieldbus interface (DeviceNet, Profibus) or the
diagnostic port may result in incorrect data and data transmission
errors.
Therefore, it is inadmissible to simultaneously operate the gauge via
the RS232C and DeviceNet, Profibus, RS485C or diagnostic port.
The protocols of the RS232C and RS485C interfaces are identical except that in
the RS485C protocol, the address is added.
The Serial Interface is used in Master-Slave mode. Without a corresponding
request from the Master, the device does not transmit any data.
Instructions to the gauge are transmitted via binary protocol.
• binary
• 8 data bits
• 1 stop bit
• no parity bit
• no
handshake
• RS232, TxD Pin 13
• RS232, RxD
Pin 14
• Supply common Pin 4
(sensor cable connector)
The address of the RS232C interface need not be set. For the protocol 0 is always
used. The transmission rate can be set as parameter (
→  6).
• RS485 B+ Pin 1
• RS485 A–
Pin 2
• RS485 +5 V Pin 7
• RS485 GND Pin 8
(sensor cable connector)
General Information
Interface Protocol
Data format
RS232 pin assignment
RS232 address and
transmission rate
RS485 pin assignment