QTech QDR Digital 900MHz User Manual

QDR – QTech 900MHz Digital Radio

Owner’s Manual

QDR – QTech Digital Radio – Owners Manual – v1.3 – August 2012 2

Table of Contents

1.0 Document Revision History.............................................................................. 3

1.1 Change Control .......................................................................................................3

1.2 Confidentiality and Copyright .................................................................................3

2.0 Introduction ...................................................................................................... 4

3.0 Connections..................................................................................................... 5

3.1 Power Connector – 2.1mm DC Socket ....................................................................5

3.2 Aerial Connector – SMA Socket .............................................................................5

3.3 USB Port – Type B Socket......................................................................................5

3.4 RS232 Serial Port – DB9 Female Connector ...........................................................5

3.5 RS485 Serial Port – RJ12 Socket ............................................................................6

4.0 Status Indicators .............................................................................................. 6

5.0 Applications ..................................................................................................... 7

5.1 RS232 Mode ...........................................................................................................7

5.2 RS485 – Half Duplex Mode ....................................................................................7

5.3 RS485 - Full Duplex Mode .....................................................................................9

6.0 Jumper Settings ..............................................................................................10

7.0 Configuration Parameters ...............................................................................11

8.0 Important Notes and Warnings .......................................................................12

9.0 Troubleshooting ..............................................................................................13

10.0 Specifications..................................................................................................14

User Notes.................................................................................................................15

www.qtech.co.nz Tel: [phone]

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

1.0 Document Revision History

Rev Description Date Author

1.3 Added note for different RS485 cable
options (and pinouts) and updated wording
on power supply warning.

1.2 Added extra cable pin outs, address change
& corrected power plug to 2.1mm & PSU
warning

1.1 Amend for 256byte packets, v1.10 firmware April 2011 TR

1.0 Original Jan 2011 RH

Aug 2012 IH

Mar 2012 AM

1.1 Change Control

This document is maintained under change control. Any requests for change should
go to:
QTech Data Systems Limited
12 Midas Place
Middleton
Christchurch 8024
New Zealand
Ph [phone]
Fax [phone]
Email [e-mail]

1.2 Confidentiality and Copyright

 Copyright QTech Data Systems Limited 2012. All rights reserved.

This document is the property of QTech Data Systems Limited. It may not be copied,
distributed or recorded on any electronic or other medium without the express written
permission of QTech Data Systems Limited.

All material contained in this document which is not readily available in the public
domain is regarded as confidential to QTech Data Systems Limited and may not be
divulged to any third party without the express written permission of QTech Data
Systems Limited.

www.qtech.co.nz Tel: [phone]

QDR – QTech Digital Radio – Owners Manual – v1.3 – August 2012 4

2.0 Introduction

The QDR is a Frequency Hopping Spread Spectrum (FHSS) digital radio operating in
the 921.5 – 928.0MHz ISM band.

The QDR is used for connecting serial devices as a wireless link. It can be regarded
as a wireless alternative to RS232/RS485 cable connections.
Serial interface options are Full Duplex RS485, Half Duplex RS485, or RS232.
The radios can be supplied pre configured and with a suitable cable for these modes
of operation.
The radio can be configured to operate in Repeater Mode, whereby it stores and
retransmits any (RF) data packets it receives.

Each QDR (P/N PD9119-485) is supplied
with the following:
Qty 1x QDR Radio
Qty 1x Internal Stub aerial, 2dBi gain
Qty 1x 1m Power Cable
Qty 1x 1m Serial Cable RS485

Alternatively P/N PD9119-232 is the
RS232 version which is supplied with a
1m RS232 serial cable.

A range of quality external aerials are
also available:
PD9225 - 4 element Yagi, 9dBi gain with
5m coax and SMA connector
PD9218 - Whip aerial, 5dBi gain with 5m
coax, bracket and SMA connector

Note – The RS485 cable differs depending on whether connecting to a XL4
RTU (RJ12 to RJ12) or another device (RJ12 to RJ10), the respective P/N are
CB-QDR-RS485-XL4 & CB-QDR-RS485.

www.qtech.co.nz Tel: [phone]

QDR – QTech Digital Radio – Owners Manual – v1.3 – August 2012 5

3.0 Connections

The connections of the QDR are identified below:

3.1 Power Connector – 2.1mm DC Socket

Centre pin +V.
Spare power cables are available, P/N CB-QDR-PWR.

Warning – Do NOT use Switch Mode Power Supplies (SMPS) with this
product. The DC power supply used for this product MUST have a grounded
negative or be a “linear” transformer based plug pack. The reason is that the
aerial, programming port and external connections can provide exposed earth
points and the SMPS can impose an AC voltage on the DC ground, which can
lead to damage. Suitable cost effective plug packs are available from QTech
P/N PD5412.

3.2 Aerial Connector – SMA Socket

This is used to connect a suitable aerial with an SMA plug. Please refer to the notes
in section 8 of this manual.

3.3 USB Port – Type B Socket

This is used for configuration via PC or upgrading the radio firmware.

3.4 RS232 Serial Port – DB9 Female Connector

This is used to connect to RS232 devices. Refer to applications.
Spare RS232 cables are available, P/N CB-QDR-RS232.

www.qtech.co.nz Tel: [phone]