APPENDIX A: DB25 Pin Assignments

Appendix A: DB25 Pin Assignments

 

Pin

Desig-

Function

LCD

Source

 

 

nation

Indicator

 

 

 

 

 

 

 

 

1

AA

Frame ground—not connected

 

 

 

 

 

 

 

 

 

 

2

BA

Transmit data (TD)

TD

DTE

 

 

 

 

 

 

 

 

3

BB

Receive data (RD)

RD

Modem

 

 

 

 

 

 

 

 

4

CA

Request to send (RTS)

RS

DTE

 

 

 

 

 

 

 

 

5

CB

Clear to send (CTS)

CS

Modem

 

 

 

 

 

 

 

 

6

CC

Data set (modem) ready (DSR)

MR

Modem

 

 

 

 

 

 

 

7

AB

Signal Ground (SG)

 

Ground

 

 

 

 

 

 

 

 

8

CF

Carrier Detect (CD)

CD

Modem

 

 

 

 

 

 

 

9

+P

Testing voltage, +10V

 

Modem

 

 

 

 

 

 

 

 

10

-P

Testing Voltage - 10V

 

Modem

 

 

 

 

 

 

 

 

15

DB

Transmit Clock (TC)

 

Modem

 

 

 

 

 

 

 

 

17

DD

Receive Clock (RC)

 

Modem

 

 

 

 

 

 

 

 

18

CN

Analog loopback (ALB) control1

 

DTE

 

 

 

 

 

 

 

 

20

CD

Data terminal ready (DTR)

TR

DTE

 

 

 

 

 

 

 

 

21

CN

Remote digital loopback (RDL) control1

 

DTE

 

 

 

 

 

 

 

 

22

CE

Ring Indicator (RI)

R

Modem

 

 

 

 

 

 

 

23

CH

Speed Select (CH/CI)2

 

DTE

 

 

 

 

 

 

 

24

DA

External transmist clock

 

DTE

 

 

 

 

 

 

 

25

CN

Test mode indicator (TM)3

TM

Modem

 

 

 

 

 

 

 

 

1+voltage activates indicated loopback test (only if ALB-DTE controled or RDL-DTE controled option is enabled); -voltage disables test.

2+voltage, 14,400 bps; -voltage, 2400 bps.

3Alternatively, pin 25 may be used for analog loopback (ALB) control. See Appendix D.

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Black Box MD885A-R3, MD885AE-R2, MD885C-R2, 34336 user manual Pin Desig Function, Source Nation Indicator

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