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Air Traffic Control (ATC) Secondary Surveillance Radar (SSR) DTE and DCE synchronous serial port definition

RS-232 interface DB25 pin definition :

PIN Signal Name Description DTE Direction DCE Direction
2

TxD

Send Data

Output

Input

3

RxD

Receive Data

Input

Output

7

GND

Signal Ground

 

 

17

RxC

Receive Clock

Input

Output

24

TxC

Send Clock

Output

Input

 

RS-4222 interface DB25 pin definition :

PIN

Signal Name

Description

DTE Direction

DCE Direction

2

TxD+

Send Data Positive

Output

Input

14

TxD-

Send Data Negative

Output

Input

3

RxD+

Receive Data Positive

Input

Output

16

RxD-

Receive Data Negative

Input

Output

7

GND

Signal Ground

 

 

17

RxC+

Receive Clock Positive

Input

Output

9

RxC-

Receive Clock Negative

Input

Output

24

TxC+

Send Clock Positive

Output

Input

11

TxC-

SendClock Negative

Output

Input

 

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