Pinouts >  Схемы кабелей для последовательных портов
9 pin D-SUB female connector layout
9 pin D-SUB female connector
Use this cable between computer (DTE) and printer (DTE) devices.
  DB-9 DB-25  
Transmit Data 3 3 Receive Data
Receive Data 2 2 Transmit Data
Clear To Send + Data Set Ready 8 + 6 20 Data Terminal Ready
Carrier Detect + Data Terminal Ready 1 + 4    
Ground 5 7 Ground
25 pin D-SUB male connector layout
25 pin D-SUB male connector
На распиновку Serial Printer (9-25) cable есть 5 отзыв(а): 2 положительных и 2 отрицательных.

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