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2. The MOXA board and driver are activated but cannot transfer (transmit/receive)
data.
Hardware Causes and Solutions:
a. Make sure the cable wiring is connected correctly. Refer to the “Connection Cable
and Cable Wiring” chapter for correct cable connections.
b. The cable or the board are probably defective. Try other ports, cables, or boards to
verify this, or use the PComm Diagnostic utility to test the MOXA board’s and port
conditions. If Diagnostic reports an error, replace the faulty components.
Software Causes and Solutions:
a. Industio CP-134U Series boards will check the line status (CTS) before
transmitting data if the RTS/CTS flow control feature is set to Enable in the
configuration or application program. Refer to the Connection Cables and Cable
Wiring chapter for proper wiring diagrams, and check the line status of the
suspected port using the diagnostic LED indicators on the mini tester.
b. The board controlling application might not be correctly written according to the
corresponding API of the operating system. To check this problem, run another
existing and known good application or use the utilities provided by Moxa (such
as Pcomm Terminal emulator or HyperTerminal under Windows NT and Windows
95/98).
Industio CP-134U Series User’s Manual
6-2