Q71B
– Quick Start Guide – v1.4 – May 2022
Ph: +64 3 366 3713
Page 4 of 6
Configuration
The DATRAN RTU must be configured to use the Q71B for communications.
Power up the RTU and connect to QTech Workbench or use Q90 software for older Q03 RTUs.
N
avigate to the “Communications” options and set “Device Type” as shown below.
The upper RS232 port is configured in the same way.
XL4 Plus & XL4 RTU Configuration
Q03 RTU Configuration
The default settings are optimised for typical systems and should not need to be changed.
Diagnostics
The Q71B has three status LEDs.
PWR
– Power. Green LED is on when power is applied.
RX
– Receive. Orange LED in on when radio mute is active.
TX
– Transmit. Orange LED is on when RTU is transmitting.
If the Green PWR LED is not on check the power supply and fuse.
The fuse is a 500mA fast blow surface mount fuse.
Audio Signal Level Tuning
This process is performed as part of the factory setup at QTech prior to delivery.
The default signal level is -3 dBm (548mV)
into a 600 Ω resistive load.
These steps are included should future calibration or checks be required.
Once the RTU has been configured to use the Q71B, the transmit audio signal level can be adjusted by
pressin
g the “
Set TX Level
” button in QTech Workbench or Q90.
This makes the Q71B transmit a continuous tone. To measure the level, use an AC voltage meter across the
pins
of the connector labelled “LVL” inside the Q71B.
Turn the potentiometer anti-clockwise to reduce the signal level
Turn the potentiometer clockwise to increase the signal level