The RS232 pin out on a F3-style main board for a F-Series HandKey or a F-Series HandPunch to the J4 connector is Pin 1 (Pin 1 is the farthest pin from the edge of the board) is Ground, Pin 2 is Receive, and Pin 3 is Transmit.
For a DB9 serial connector, Pin 5 is Ground, Pin 3 is Transmit, and Pin 2 is Receive. For a DB25 serial connector, Pin 7 is Ground, Pin 2 is Transmit, and Pin 3 is Receive.
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