RS-232C Interface Connection Diagram (for DOS/V Version)

Serial Interface Connector on the Back of the PC and Signal Name

Connection Diagram of Reverse Cable (25pin D-SUB to 9pin D-SUB)

You must select cables according to 3 solid arrows shown above. If you alter the cable, you should connect pins according to all 5 arrows.

If you have cross cables to connect 25 pin D-sub male and 25 pin D-sub male, use a gender changer (25 pin D-sub female - 9 pin D-sub female) to meet the connection diagram shown above.