H E Y E R P a s i t h e c
Rev. 0.2 Draft – 12/09 HEYER Pasithec, Operator’s manual 59 / 106
6.3.3 Communication Port
Two RS-232 ports (COM-A and COM-B) on the rear of the display are communicating ports. The
connection of RS-232 permits serial inlet and outlet of command and data.
The interface of COM-A port is a DB9/M needle connector and is used for data communication or to
connect the gas monitor module. The Signal Definition of the port is DTE.
Pin # Signal Name Signal Description
2 RXD RS232 Receive Data, input of the machine.
3 TXD RS232 Transmit Data, output of the machine.
5 GND Signal Ground / Common
9 5V DC5V power, provide output power in gas monitor module, <200mA.
In data communication, this pin and the RI output signal of RS232C
indicates electrical compliance.
Other NC Not connected.
The interface of COM B port is a DB9/M hole connector and is used for data communication. The
Signal Definition of the port is DCE.
Pin # Signal Name Signal Description
2 TXD RS232 Transmit Data, output of the machine.
3 RXD RS232 Receive Data, input of the machine.
5 GND Signal Ground / Common
Other NC Not connected.
6.3.4 Gas Inlet Module
The Gas Inlet Module includes pipeline gas supply and standby gas supply.
The pipeline connector and standby gas supply connector all adopt DISS (Diameter-indexed safety
system), which can prevent wrong connections.
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