B-4
Appendix B
232D4SS84502 Manual
B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104
B&B Electronics Ltd – Westlink Comm. Pk – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445
Chart 7. IBM PC DB25 Connector to Ports A - H (DTE)
Master port configured as a DTE port with a modem
connected (see Chart 3).
IBM PC
Serial Port
DB25 Connector
Signal
Direction
232D4SS8
Ports A - H (DTE)
DB25 Connector
2
----------->
3
3
<-----------
2
4
----------->
5
5
<-----------
4
6
<---- ---->
6*
7
<--------->
7
8
<-----------
20
20
----------->
6*
* Pins 6 & 8 are tied together inside the 232D4SS8 and share the
same input.
Chart 8. IBM PC DB9 Connector to Ports A - H (DTE)
Master port configured as a DTE port
with a modem connected (see Chart 3).
IBM PC
Serial Port
DB9 Connector
Signal
Direction
232D4SS8
Ports A - H (DTE)
DB25 Connector
3
----------->
3
2
<-----------
2
7
----------->
5
8
<-----------
4
6
<---- ---->
6*
5
<--------->
7
1
<-----------
20
4
----------->
6*
* Pins 6 & 8 are tied together inside the 232D4SS8 and share
the same input.
