Wiring a B&B-485PTBR (232-485 converter)

See attached document for diagram

How to convert the 4-wire connection to a 2-wire 485 connection

Jumper the RD(A) and TD(A) together. Jumper the RD(B) and TD(B) together.
Place 12vDC power on the converter.
Connect your TRX+ wire to TD(B), and your TRX- wire to TD(A).
Plug the 232 (DB9) side in the COM/Serial port of the DVR .

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