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9-25 Pin Null Modem Cable

Use this cable between two DTE devices (for instance two computers).

(To Computer 1).
(To Computer 2).

25 PIN D-SUB FEMALE to Computer 1.
25 PIN D-SUB FEMALE to Computer 2.

  D-Sub 1 D-Sub 2  
Recieve Data 3 2 Transmit Data
Transmit Data 2 3 Recieve Data
Data Terminal Ready 20 6+8 Data Set Ready + Carrier Detect
System Ground 7 7 System Ground
Data Set Ready + Carrier Detect 6+8 20 Data Terminal Ready
Request to Send 4 5 Clear to Send
Clear to Send 5 4 Request to Send
Note: DSR & CD are jumpered to fool the programs to think that their online.
Contributor: Joakim Ögren, Drew Sullivan, Niklas Edmundsson
Source: ?
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   Last updated March 21 2017.