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APPENDIX A: Troubleshooting
Modem Control Signals, a full pin loopback plug
will be required. Details on loopback plugs are
included within WinSSD.
4. When testing the USB Single-Port Hub
(RS-422/485) in loopback mode, you should see
both the TX and RX LEDs flashing as well as
seeing echoed data on the screen. The loopback
test first transmits a HEX pattern, 55AA, and then
an ASCII string of data. If this test passes, then the
Hub is ready for use in your application.
5. Please note that if the card is configured for 2-wire
RS-485 with no echo, a loopback test is not
possible. The receiver in this case will be turned
off and the test will fail. If you plan on using this
device in two-wire mode, test the hub in RS-422
mode first. Then configure the hub for your
application.
A.2 Calling Black Box
If you determine that your USB Single-Port Hub
(RS-422/485) is malfunctioning, do not attempt to alter
or repair the unit. It contains no user-serviceable parts.
Contact Black Box at 724-746-5500.