Serial 9 to 25 adapter

pinout

This adapter will enable you to connect a 25 pin serialcable to a 9 pin connector at the computer

9 pin D-SUB male connector  to the computer

9-Pin 25-Pin Carrier Detect 1 8 Receive Data 2 3 Transmit Data 3 2 Data Terminal Ready 4 20 System Ground 5 7 Data Set Ready 6 6 Request to Send 7 4 Clear to Send 8 5 Ring Indicator 9 22

25 pin D-SUB female connector  to the cable

Source:www.pinouts.ru