B&B Electronics ESP904 - Manual - Manual (Page 80)

RS-232 Connections
70 Appendix A Manual Documentation Number: ESP904-4513m
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 – www.bb-elec.com
B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445 – www.bb-europe.com
RS-232 DTE Loopback Connections
Figure 62. Loopback Connections for RS-232
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.