Brainboxes PX-823 Manual download pdf (Page 24)

PX Range Product Manual Version 2.3 © Copyright Brainboxes Limited 2013 Page 24 of 45

Connect the Port 2 DTR line, pin 4 to the other PC DCD, pin 8 and CTS, pin 5, lines. Also, connect up the

other PC DTR line, pin 20 to the Port 2 DCD, pin 1 and CTS, pin 8, lines.

This allows the receiving device to signal when it can no longer accept data. The receiving device sets DTR

false when it is unable to receive any more data. The sending device reads DTR on its CTS and DCD pins. It

should stop sending when CTS goes false.

Connect the Port 2 RTS line, pin 7, to the other PC DSR line, pin 6. Also, connect the other PC RTS line, pin

4, to the Port 2 DSR line, pin 6. This RTS line is used to let the other device know that it is ready for data

exchange.

2.9. RS-422/485 Settings and Information

• To achieve RS-485 Half Duplex Communications, it is necessary to short Pins 1 and 6 together, and

pins 2 and 7 must also be physically shorted together. This can be done via the on-board Multi-plex

jumpers.

• Once your wiring is setup, you will also need to set the card to FULL or HALF Duplex mode in the

software.

This diagram shows the PX-310 where

Port 2 is set up for half-duplex by

placing jumpers across HDX2+ and

HDX2-

In the example shown, Port 1 is set up

for full duplex as there are no jumpers

across HDX1+ or HDX1-

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Brainboxes PX-823 Manual Page 24