Filter
Top Products
Appendix A - Troubleshooting
OMG-CONV-485-ISO Page 12
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.