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Serial port

The serial port has 25 or 9 pins. Do not confuse with the printer port which has 25 sockets.

USB to serial port adapters

Yes, these work!

25 to 9 pin translation

If you have a 9 pin connector on the PC, the 25 to 9 pin conversion for send/receive and ground is:

  • 9 pin adapter pin 3 = 2 on 25 adapter pin
  • 9 pin adapter pin 2 = 3 on 25 adapter pin
  • 9 pin adapter pin 5 = 7 on 25 adapter pin

Or just use a 25 to 9 pin adapter.