QTech Data Systems QDR Digital 900MHz Radio - Manual (Page 5)

QDR – QTech Digital Radio – Owners Manual – v1.3 – August 2012 5
www.qtech.co.nz Tel: 03 3663713
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.