RS-232 Loopback plug

When you have inserted the RS-232 plug first make sure that the RS-232 is functioning according to the specification.

Creating a RS232 Loopback connector

  • Cut off an eight-pin connector about three inches from the end.
  • Number the pins 1 thru 8 as you like.
  • Splice the pin wire pairs as follows:
    • 1-3
    • 2-7
    • 4-5
    • 6-8