
The Following is information for building your own RS-232 Serial Port
Loop Back Tester. This is required for many Serial Port Testing
programs such as the tests performed by Check-It Software from
Touch Stone Software.

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25 Pin Connector:

Connect Pin 2 to Pin 3 (XMIT DATA to RCV DATA)

Connect Pin 4 to Pin 5 (RTS to CTS) and Connect Pin 5 to Pin 22 (RING)

Connect Pin 6 to Pin 8 (DSR to CD) and Connect Pin 8 to Pin 20 (DTR)

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9 Pin Connector:

Connect Pin 3 to Pin 2 (XMIT DATA to RCV DATA)

Connect Pin 7 to Pin 8 (RTS to CTS) and Connect Pin 8 to Pin 9 (RING)

Connect Pin 6 to Pin 1 (DSR to CD) and Connect Pin 1 to Pin 4 (DTR)

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Enjoy,

Jim Kramer
Orlando, Florida

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