Appendix A - Troubleshooting
Appendix A - Troubleshooting
Serial Utility test software is supplied with the adapter and will be used in the troubleshooting procedures. By using this software and following these simple steps, most common problems can be eliminated without the need to call Technical Support.
1.The OMG-CONV-485-ISO is a level converter and therefore requires no system resources such as I/O ports or IRQ’s. The I/O resources of the host RS-232 COM: port will be used to access the port.
2.If you are experiencing problems, a good starting point is to verify proper operation of the host RS-232 COM: port. Connect the host port TX and RX lines and use the WinSSD utility to perform a loopback test. If you cannot open the host port, ensure that it is enabled in the System BIOS. If using a Plug ‘n’ Play operating system, verify that it is recognized by the system.
3.If the host RS-232 port is working properly, verify that the OMG-CONV-485- ISO is configured correctly for your application based on the ‘Card Setup’ section earlier in this manual. After attaching the OMG-CONV-485-ISO, you may perform a loopback test by connecting TX+ to RX+ and TX- to RX-. Keep in mind that this test will fail should you have dip switch SW2 position 6 on. This forces the OMG-CONV-485-ISO into ‘No Echo’ mode and will prevent the loopback test from passing. For loopback purposes, always have dip switch SW2 position 6 off even if you will use No Echo in your actual application.
4.During the loopback test, pay attention to the TX and RX leds as both of these should be on. Failure of one or both of these to be on would indicate a hardware problem on the adapter.
