Instruction manual

ControlWave Gas Flow Computer (GFC Plus) Instruction Manual (CI-ControlWave GFC Plus)

2-28 Installation Revised Feb-2013

Table 2-7. RS-232 COM1 and COM2 Port Connector Pin Assignment

RS-232

Signal

RS-232 Description

Local Port Pin# Local Port Notes:

1 DCD Data Carrier Detect Input 1 (Green wire)

2 RXD Receive Data Input 2 (Red wire)

3 TXD Transmit Data Output 7 (White wire)

4 DTR Data Terminal Ready Output 4 (Brown wire) Pin 4 connected to pin 4 at

TB5 of CPU = external power

for local communication port

cable.

5 GND Power Ground 6 (Black wire)

6 DSR Data Set Ready Input

7 RTS Request to Send Output

RTS connected to CTS at J4

of CPU for local port

communication cable.

8 CTS Clear to Send Input

RTS connected to CTS at J4

of CPU for local port

communication cable.

9 N/A

Use the “null modem” cable for full-duplex (PPP protocol)

communications when connecting a ControlWave GFC Plus to a PC.

(See top part of Figure 2-17.)

Table 2-8. RS-232 COM1 (J11) Alternate Connector Pin Assignment

RS-232

Signal

RS-232 Description

1 GND Power ground

2 RXD Receive data input

3 TXD Transmit data output