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ControlWave Gas Flow Computer (GFC Plus) Instruction Manual (CI-ControlWave GFC Plus)
Port Loop-back
Test
Option
Tests
COM2, and COM3. The External loop-back tests
require the use of a loop-back plug.
Discrete I/O
Checks DIs and DOs on the Process I/O board.
EEPROM
Checks the EEPROM.
Keyboard & Display
Checks the optional display/keypad hardware.
WINDIAG allows you to select the communication port to test.
Depending on the type of network (RS-232 or RS-485) and the port in
question, a special loop-back plug is required:

Port 1 - RS-232 uses a 9-pin female D-type loop-back plug (see
Figure 5-6).
Figure 5-6. COM1 & COM2 RS-232 Loop-back Plug/Wires


Port 2 - RS-232 use loop-back wires (see Figure 5-6).
Port 3 - RS-232 use loop-back wires (see Figure 5-7).
Figure 5-7. COM3 RS-232 & RS-485 Loop-back Wires
Revised Feb-2013
Service & Troubleshooting
5-15