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A reply on the ever returning question When do I need to use what type of cable ?

A connection is made through the serial port, each pin on a serial port has its function. DB9

 DB9  DB25
pin numbersignal pin numbersignal
1Data carrier detect 1-
2Receive data 2Transmit data
3Transmit data 3Receive data
4Data terminal ready 4Request to send
5Signal ground 5Clear to send
6Data set ready 6Data set ready
7Request to send 7Signal ground
8Clear to send 8Data carrier detect
9Ring indicator 9-
   10-
   11-
   12-
   13-
   14-
   15-
   16-
   18-
   19-
   20Data terminal ready
   21-
   22Ring indicator
   23-
   24-
   25-

The first thing you need to know is the difference between a SERIAL Cable (CROSSED calble, printer cable, null modem) and a STRAIGHT Cable

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Page last modified on April 23, 2008, at 10:40 AM