Serial interfaces cables and converters scheme
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
9 pin D-SUB female connector layout
9 pin D-SUB female connector
at the computer
25 pin D-SUB male connector layout
25 pin D-SUB male connector
at the printer cable
According to 5 reports in our database (2 positive and 2 negative) this pinout may be incorrect.

Is this pinout
Serial Printer (9-25) cable visual pinout:
Serial Printer (9-25) cable diagram
click to enlarge
Source(s) of this and additional information: Hardware Book
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