Quatech DSE-410D manual Appendix a RS-232, RS-422 Loopback Connections

10 Appendix A: RS-232, RS-422 Loopback Connections

For Transmit and Receive loopback, connect only those lines.

When Flow Control setting on the Serial device server is set for RTS/CTS, those lines must be looped. Usually DTR and DSR must also be looped. The Flow Control setting for the program must match the Server settings. The CD connection is needed by some terminal programs to simulate Carrier.

The RS-485 Connections are half duplex, either Receive or Transmit, so another half duplex device must be used to check operation.

Document Number: 940-0186-100 – DSE-410D Owner’s Manual A-1

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