ABB NGC8200 - Serial Communications Troubleshooting; RS-232 Communication Issues; RS-485 Communication Tests

2101510MNAH | NGC8200 AND PGC1000 USER MANUAL | 135
9. Was the damaged cable found? If yes, replace the appropriate cable.
10. If not, see section 10.16 to replace the module.
11. Reinstall the analytical module.
12. Reinstall the digital controller assembly.
13. If disconnected during a procedure, reconnect the J1 power supply connector to the termination
panel. It may require 10-60 seconds for the processors in the analyzer to fully boot and for the
analyzer to start drawing normal to full power. However, under normal operation, the analyzer
should never draw current beyond its rated values.
14. Return to the equipment isolation test.
11.5 Serial communications troubleshooting
The analyzer’s serial ports support RS-232, RS-485 or RS-422 communication. The type of
communication the ports are configured for must match the type required by the communication
equipment. Review the external equipment requirements for communication and power.
 Match serial port communication parameters. A mismatch results in communication failure.
 If powering the external device from the serial port, ensure that the power range supplied by
the port will meet the device’s specifications. Voltage values outside the required range may
cause either damage to the device or communication failure.
11.5.1 RS-232 communication
Before testing RS-232 serial communication, verify that the field wiring is correct (see Table 11-7).
Table 11-7: RS-232 Field wiring on analyzer termination panel
PIN
SERIAL
PORT 1 (
J8
)
SERIAL
PORT 2 (
J10
)
1 Power Out Power Out
2
Ground
Ground
3
Switched Power Out
Switched Power Out
4 Operate Operate
5 Not Used Not Used
6 Request to Send Request to Send
7 Transmit Data Transmit Data
8
Receive Data
Receive Data
9
Clear to Send
Clear to Send
When troubleshooting RS-232 mode, verify that the termination settings of the serial port 1 (J9) and
serial port 2 (J11) on the termination panel have pins 2 and 3 jumpered.
11.5.2 RS-485 communications test
When troubleshooting RS-485 mode, verify the termination settings of serial port 1 (J9) and serial
port 2 (J11) on the termination panel are correctly jumpered (see Table 11-8).
Table 11-8: RS-485 Terminations
Serial Comm Port
1
2
Jumper
J9
J11
First or intermediate device pins 2–3 pins 2–3
Last or only device pins 1–2 pins 1–2
Before testing, look on the termination panel located inside the rear end cap to verify that the wiring
is correct (see Table 11-9).
Table 11-9: RS-485 pinouts (on termination panel)
PIN
J8
–
Port 1
J10
–
Port 2
1
Power
Power
2
Ground
Ground
3 Switched Power Out Switched Power Out
4 Operate Operate
5 Remote Request to Send Remote Request to Send
6 Transmit Bus (+) Transmit Bus (+)
7
Transmit Bus (
-
)
Transmit Bus (
-
)