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25 pin D-SUB female connector layout
Разъем 25 pin D-SUB female
This cable should be used for DTE to DCE (for instance computer to modem) connections without hardware handshaking.
  Female Male Dir
Shield Ground 1 1  
Transmit Data 2 2 -->
Receive Data 3 3 <--
System Ground 7 7  
       
Jumper these:      
Request to Send 4   -->
Clear to Send 5   <--
       
Data Set Ready 6   <--
Carrier Detect 8   <--
Data Terminal Ready 20   -->
       
Request to Send   4 -->
Clear to Send   5 <--
       
Data Set Ready   6 <--
Carrier Detect   8 <--
Data Terminal Ready   20 -->
25 pin D-SUB male connector layout
Разъем 25 pin D-SUB male
На распиновку Two-Wire modem (25-25) cable есть 4 отзыв(а): 3 положительных и 1 отрицательных.

Эта распиновка
Источник(и) этой и дополнительной информации: Hardware Book
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