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Appendix A – Troubleshooting
Once you have confirmed that the serial adapter COM ports are listed in Device Manager, use the Sealevel
WinSSD utility to verify communications. Detailed help is included in the WinSSD utility.
Please set the adapters Electrical Interface to RS-422.
If you have a loopback plug, put it on the adapter connector. If you do not have a loopback plug, you can
use female jumper wires to make the connection to verify the functionality.
RS-422 requires pins 1 & 4 (Receive + and Transmit +) and also pins 2 & 3 (Receive - and Transmit -) to be
jumpered as shown in this graphic:
If you do not have a loopback plug or jumper wires handy, you can use a metal device such as a
knife, screwdriver, key, or paperclip to short pins two and three.
© Sealevel Systems, Inc.
7802ec &7802ecS Manual | SL9680 11/2022
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