QTech Data Systems QDR Digital 900MHz Radio - Manual (Page 4)

QDR – QTech Digital Radio – Owners Manual – v1.3 – August 2012 4
www.qtech.co.nz Tel: 03 3663713
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.