RS-232 Connections
Manual Documentation Number: ESP901-902-3704 Appendix A 73
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 Pk – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445 – www.bb-europe.com
RS-232 Straight-through DB-9 to DB-25 Conversion
Connections
Figure 63. DB-9 to DB-25 Straight-through Cable Connections
RS-232 Crossover DB-9 to DB-25 Conversion Connections
Figure 64. DB-9 to DB-25 Crossover (null modem) Cable Connections
RS-232 Connections
74 Appendix A Manual Documentation Number: ESP901-902-3704
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 Pk – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445 – www.bb-europe.com
RS-232 DTE Loopback Connections
Figure 65. 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.
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