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.
