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X.21 FASTICK PINOUTS
DB25(M) Signal Designations DTE DCE X.21/V.11 DB-15 (M/F)
1
Frame Ground
     
Frame Gnd
1
2
Transmit Data A
>>   
Transmit Data A
2
3
Receive Data A
   <<
Receive Data A
4
4
Request To Send (RTS) A
>>   
  
   
5
Clear To Send (CTS) A
   <<
 
 
6
Unused / No Connect
     
  
   
7
Signal Ground
     
Signal Gnd
8
8
Data Carrier Detect (DCD) A
   <<
Indication
5
9
Receive / Timing (RXC-) B
   <<
Signal Element Timing B
13
10
Data Carrier Detect (DCD) B
   <<
Indication
5
11
Unused / No Connect
     
  
   
12
Unused / No Connect
     
  
   
13
Clear to Send (CTS) B **
   <<
  
   
14
Transmit Data B
>>   
Transmit Data B
9
15
Unused / No Connect
     
  
   
16
Received Data B
   <<
Receive Data B
11
17
Receive Timing (RXC+) A
   <<
Signal Element Timing A
6
18
Unused / No Connect
     
Unused / No Connect
7
19
Request to Send (RTS) B **
>>   
 
 
20
Data Terminal Ready (DTR) A
>>   
Control A
3
21
Unused / No Connect
     
Unused / No Connect
14
22
Unused / No Connect
     
Unused / No Connect
15
23
Data Terminal Ready (DTR) B
>>   
Control B
 10
 
   
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