Documentation Number 232MSS2-0108 Manual
Appendix B
B-3
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
Chart 3. Modem DB25 Connector to Master Port
Async Modem
Serial Port
DB25 Connector
Signal
Direction
232MSS2
Master Port (DTE)
DB25 Connector
2 <----------- 2
3 -----------> 3
4 <----------- 6*
5 -----------> 20*
7 <---------> 7
8 -----------> 5
20 <----------- 4
* Pins are tied together inside the 232MSS2, they are not
connected to ports A, B, C, or D.
NOTE:
When connecting a DTE device to ports A, B, C, or D of
the smart switch, refer to Charts 8 and 9.
Chart 4. IBM PC DB25 Connector to Ports A - D (DTE)
Master port configured as a DCE port.
IBM PC
Serial Port
DB25 Connector
Signal
Direction
232MSS2
Ports A - D (DTE)
DB9 Connector
2 -----------> 2
3 <----------- 3
4 -----------> 8
5 <---------- 7
6 <---------- 6*
7 <---------> 5
8 <----------- 4*
20 -----------> 4*
* Pins are tied together inside the 232MSS2, they are not
connected to the master port.
