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Connections
Power
Power can be supplied by fitting two D cell alkaline 1.5 V batteries or the module can be supplied from an
external 5 Vdc to 18 Vdc source.
In both cases you need to fit the JP1 power jumper to supply power to the module.
When powered from the external DC source the LED will illuminate.
If internal batteries are fitted when external power is applied the batteries will be utilised if external power is lost.
For battery information please refer to
Power Options
The T24-AR can operate permanently powered or can operate from on-board batteries.
Permanently Powered
This is the simplest way to operate the repeater. With a permanent supply you do not need to worry about the
repeater sleeping or waking. You can optionally choose whether the repeater always wakes sleeping modules and
then you could utilise the powering up of the repeater to wake up those modules outside the normal radio range.
Battery Powered
In low power battery mode the repeater wakes from sleep when other modules are woken and will remain awake
until it stops receiving Stay Awake messages. This will work transparently with most T24 instrumentation.
You just need to decide on the Sleep Delay for a battery powered repeater. This causes the repeater to enter
sleep mode if it does not receive stay awake messages within the Sleep Delay time.
Stay awake messages are transmitted by handhelds, analogue output modules and PC software etc. so that when
those items are turned off or disabled all other T24 modules will sleep when their Sleep Delay time elapses.
Mantracourt Electronics Limited
Pow er Jumper JP1
1
2
3
4
5
A
B
0V
+Supply
LED
Appendix D – Battery Selection
2 X D Cell Batteries
369
T24 Telemetry User Manual
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