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Chart 3. Modem DB25 Connector to Master Port
Async Modem
Serial Port
DB25 Connector
2
3
4
5
7
8
20
* 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
2
3
4
5
6
7
8
20
* Pins are tied together inside the 232MSS2, they are not
connected to the master port.
Documentation Number 232MSS2-0108 Manual
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
232MSS2
Signal
Master Port (DTE)
Direction
DB25 Connector
<-----------
----------->
<-----------
6*
----------->
20*
<--------->
----------->
<-----------
232MSS2
Signal
Ports A - D (DTE)
Direction
DB9 Connector
----------->
<-----------
----------->
<----------
<----------
6*
<--------->
<-----------
4*
----------->
4*
Appendix B
2
3
7
5
4
2
3
8
7
5
B-3
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