A.4 rs-232/422 connector, Table a-2. pc (db-25)-to-model 187 connections for, Table a-3. pc (db-9)-to-model 187 connections for – American Magnetics 187 Self-Compensating Liquid Level Controller User Manual

Page 71: Appendix

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Appendix

RS-232/422 Connector

A.4 RS-232/422 Connector

Table A-2. PC (DB-25)-to-Model 187 connections for RS-232 operation.

PC (DTE)

DB-25 Pin

Model 420 (DCE)

DB-9 Pin

DTE

Function

2

3

TD

3

2

RD

4

7

RTS

5

8

CTS

6

6

DSR

7

5

GND

8

1

DCD

20

4

DTR

22

9

RI

Table A-3. PC (DB-9)-to-Model 187 connections for RS-232 operation.

PC (DTE)

DB-9 Pin

Model 420 (DCE)

DB-9 Pin

DTE

Function

3

3

TD

2

2

RD

7

7

RTS

8

8

CTS

6

6

DSR

5

5

GND

1

1

DCD

4

4

DTR

9

9

RI

-

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