Check the send and receive lines for RS-232C, RS-422 and network
communication. Use this check when an error occurs.
When checking RS-232C and RS-422, you need to connect the SIO
cable.
Checking the COM port is not available in
GP-4104, GP-4107 and AST-3211A (MPI) units.
Preparing the loopback cable
You need to prepare a loopback cable to check COM1/COM2/LAN. The
wiring of the loopback cable is as follows:
GP3000 series (except for
GP-3302B)
GP-3302B
GP-4100 Series
Mode
Supported Models
RS-232C Mode
GP-4105
RS-422 Mode
GP-4106
GP-4*01TM
Check
Connect the loopback cable to one of the interfaces and check
the operation. When the operation is acceptable, [OK] is displayed. When there is a
problem, [NG] is
displayed.