Appendix B: Connector Pinouts

Appendix B. Connector Pinouts

B.1 DB9 M Connector

Figure B-1. DB9 M connector.

Table B-1. DB9 M connector pinout.

DB9 M Pin

Direction

RS-232

 

 

 

1

Input

DCD

 

 

 

2

Input

RXD

 

 

 

3

Output

TXD

 

 

 

4

Output

DTR

 

 

 

5

GND

 

 

 

6

Input

DSR

 

 

 

7

Output

RTS

 

 

 

8

Input

CTS

 

 

 

9

Input

RI

 

 

 

B.2 Terminal Block

Figure B-2. Terminal block connector.

Table B-2. Terminal block connector pinout.

Terminal

RS-232

Direction (RS-232)

RS-422

RS-485

 

 

 

 

 

A

RTS

Output

TDA (-)

Data A (-)

 

 

 

 

 

B

TD

Output

TDB (+)

Data B (+)

 

 

 

 

 

C

CTS

Input

RDA (-)

 

 

 

 

 

D

RD

Input

RDB (+)

 

 

 

 

 

E

GND

GND

GND

 

 

 

 

 

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Black Box LES431A manual Appendix B Connector Pinouts, Appendix B. Connector Pinouts DB9 M Connector, Terminal Block