Parallel Port LoopBack plug
Used to test the operation of Parallel ports on a PC.
Used with almost all Checking Software.
The Parallel Port external loopback testing requires a D25 parallel port loopback plug wired as shown here.
Stobe/Select In 1, 13
Data0/Error In 2, 15
Auto FD/Paper End In 12, 14
Init/Acknowledge In/CD 10, 16
Select Out/Busy In 11, 17
All other Pins Open
Partial List of Compatible Devices