Serial port Loopback (25 Norton)

pinout

Used to verify that a port is working. This one works with Norton Utilities: Norton Diagnostics from Symantec.

25 pin D-SUB female connector  to the computer

Name Pin Pin Pin Pin Jumpering 1 2 3     Jumpering 2 4 5     Jumpering 3 6 8 20 22

Source:www.pinouts.ru