Documentation Number: ESP902-2303 Manual
Appendix
A-1
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104
B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445
APPENDIX A: RS-232, RS-422 LOOPBACK CONNECTIONS
For Transmit and Receive loopback, connect only those lines.
When Flow Control setting on the Serial 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.