B&B Electronics 232MSS2 manual Chart 3. Modem DB25 Connector to Master Port Async Modem

Chart 3. Modem DB25 Connector to Master Port

Async Modem
Serial Port		Signal
DB25 Connector	Direction
2	<-----------
3	-----------	>
4	<-----------
5	-----------	>
7	<---------	>
8	-----------	>
20	<-----------

232MSS2

Master Port (DTE) DB25 Connector

2

3

6*

20*

7

5

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	Signal
DB25 Connector	Direction
2	-----------	>
3	<-----------
4	-----------	>
5	<----------
6	<----------
7	<---------	>
8	<-----------
20	-----------	>

232MSS2

Ports A - D (DTE)

DB9 Connector

2

3

8

7

6*

5

4*

4*

*Pins are tied together inside the 232MSS2, they are not connected to the master port.

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