Qtech-data-systems QDR Digital 900MHz Radio Manuel d'utilisateur télécharger pdf (Page 9)

QDR – QTech Digital Radio – Owners Manual – v1.3 – August 2012 9

www.qtech.co.nz Tel: 03 3663713

5.3 RS485 - Full Duplex Mode

This mode is used for serial data communications where all four signal lines are

required.

Jumper Settings for Full Duplex RS485 (4-Wire)

Refer to Section 6 for further details on the jumpers

Jumper Position

JP3 In

JP4 In

JP5 Out

JP6 Out

Pinout of RS485 Port when in Full Duplex Mode

Pin Signal Input/Output Description

1 GND - Ground

2 B Input Inverting Receiver Input

3 A Input Non inverting Receiver Input

4 Z Output Inverting Driver Output

5 Y Output Non inverting Driver Output

6 GND - Ground

Typical Full Duplex Connection

Note: Line termination resistors are inside the QDR

120 Ohm

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

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Qtech-data-systems QDR Digital 900MHz Radio Manuel d'utilisateur Page 9