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 ...........................................................
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. Added extra cable pin outs, address change & corrected power plug to 2.1mm & PSU warning Amend for 256byte packets, v1.10 firmware Original Aug 2012 IH Mar 2012 AM April 2011 Jan 2011 TR RH 1.2 1.1 1.0 1.
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.
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.
QDR – QTech Digital Radio – Owners Manual – v1.3 – August 2012 3.5 6 RS485 Serial Port – RJ12 Socket This is used to connect to RS485 devices in either half or full duplex modes. Refer to applications. Spare RS485 cables are available, P/N CB-QDR-RS485. 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. 4.0 Status Indicators There are three status indicators on the QDR.
QDR – QTech Digital Radio – Owners Manual – v1.3 – August 2012 7 5.0 Applications 5.1 RS232 Mode This is used for serial data communications. A typical use of this mode would be: RS232 DATRAN Master RTU Slave RTU The serial cable is connected from the RS232 port of the QDR to an RS232 port of the RTU. Pinout of RS232 Port and interface cable connections.
QDR – QTech Digital Radio – Owners Manual – v1.
QDR – QTech Digital Radio – Owners Manual – v1.3 – August 2012 5.3 9 RS485 - Full Duplex Mode This mode is used for serial data communications where all four signal lines are required.
QDR – QTech Digital Radio – Owners Manual – v1.3 – August 2012 10 6.0 Jumper Settings A list of all jumpers and their positions on the QDR has been provided for reference. Jumper JP1 JP2 JP3 JP4 JP5 JP6 JP7 Description ISP Programming Enable ISP Programming Enable RS485 120 Ohm Line termination on A-B RS485 120 Ohm Line termination on Y-Z RS485 A-Y Link RS485 B-Z Link RF Power Amplifier Bias Disconnect www.qtech.co.
QDR – QTech Digital Radio – Owners Manual – v1.3 – August 2012 11 7.0 Configuration Parameters The QDR is configured by QTech via the USB Port using a desktop application.
QDR – QTech Digital Radio – Owners Manual – v1.3 – August 2012 12 8.0 Important Notes and Warnings Aerial Connection The QDR should never be operated without an aerial connected. If the radio transmits without an aerial the RF power has nowhere to go but back into the radio, which can damage it. Transmitted RF Power Levels The QDR must never be operated in violation of RSM license conditions. Ensure that the Transmit Power Level and aerial system design do not exceed the limitation.
QDR – QTech Digital Radio – Owners Manual – v1.3 – August 2012 13 A QDR variant is available which has a reverse polarity RP-SMA aerial connector which will allow you to use the existing aerials. Please order P/N PD9119-U/G. 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.
QDR – QTech Digital Radio – Owners Manual – v1.3 – August 2012 14 9.0 Specifications Performance Indoor/Urban range (2.1dBi dipole antenna): Up to 500m Outdoor line-of-site range (2.
QDR – QTech Digital Radio – Owners Manual – v1.3 – August 2012 15 User Notes www.qtech.co.
