Herein is the scematic picture of 9-Pin RS232 Line Booster Signal Direction from an example of 232LB9R model (B&B electronics). This device is a 9-pin RS-232 repeater that re-transmits all 8 signals and carries the ground line through.
The schematic shows the direction of flow on each line. The DB9 female connector end is pinned out as DCE and connects directly to a standard COM port on a computer or DTE interface. The DB9 Male connector is pinned out as DTE and connects to any DCE device (modem or another9-Pin RS232 Line Booster).
For long cable runs, it might need two or more line boosters for proper operation of the RS232 interface, as shown in the above schematic. It should be installed no more than 50 feet from any RS232 transceiver.
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