Instruction manual

ControlWave Gas Flow Computer (GFC Plus) Instruction Manual (CI-ControlWave GFC Plus)
Revised Feb-2013 Service & Troubleshooting 5-15
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.
Port Loop-back
Test
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