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6
6
Chapter 6 Troubleshooting
Common CP-118U Series problems and possible solutions are listed below. If you still have
problems after reading this chapter, contact your dealer or Moxa for help, or use the Problem
Report Form at the end of this manual to report problems to your dealer.
General Troubleshooting
1. The MOXA CP-118U board cannot be detected by the MOXA driver while installing
the driver.
Hardware causes and solutions:
a. The board is not installed in the computer. Please install it.
b. The board is not properly plugged into the system. If this is the case, re-plug the board
into a 32-bit PCI slot. It is also possible that a slot has malfunctioned. In this case, try
other slots until you find one that works.
c. The motherboard does not have an available IRQ for the CP-118U Series board. In this
case, enter the BIOS and make sure there is an available IRQ under PCI/PnP settings.
2. The MOXA CP-118U 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 Cables and
Cable Wiring” chapter for correct cable connections.
b. The cable or the board could be defective. Try other ports, cables, or boards to verify
this, or use the PComm Diagnostic utility to test the MOXA board and port conditions.
If Diagnostic reports an error, replace the faulty components.
Software Causes and Solutions:
a. CP-118U 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 control application might not be written correctly according to the
corresponding API of the operating system. To check this problem, run another
application that you know is correct, or use the utilities provided by Moxa (such as
Pcomm Terminal emulator or HyperTerminal under Windows NT and Windows 95/98).