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9 pin D-SUB female connector layout
Разъем 9 pin D-SUB female
at the Computer
This cable should be used for DTE to DCE (for instance computer to modem) connections without hardware handshaking.
  Female Male Dir
Shield Ground   1  
Transmit Data 3 2 -->
Receive Data 2 3 <--
System Ground 5 7  
       
Jumper these:      
Request to Send 7   -->
Clear to Send 8   <--
       
Data Set Ready 6   <--
Carrier Detect 1   <--
Data Terminal Ready 4   -->
       
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
at the Modem
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Источник(и) этой и дополнительной информации: Hardware Book
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