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4.9 Internal Li‐Po battery
In the MTX‐3G‐JAVA modem family, the BAT suffix means that the internal 3.7V 1650mAh Li‐Po
battery is attached. The unit is shipped with the battery disconnected. Please open the unit and
connect the battery connector to the main board and then plug in the power supply to the RJ power
connector for around 5 hours to fully charge the battery.
Internal batteries can be ordered for MTX‐3G‐JAVA modems with either GPS or RF variants. In any
case, you can ask to remove the GPS or RF.
The battery level can be known using the AT command AT^SBV. The command result is given in mV.
When charging, the previous value is increased by +200mV. It is also possible to know whether the
charger is connected by testing the DTR signal.
With the battery attached, the VEXT voltage value (DB15 connector, pin 10) is approximately 3.86V
when the charger is plugged in. If not, this values drops to approximately 3.46V.
We do not guarantee fully working features for battery voltages below 3.6V. We strongly
recommend that you switch the modem off completely when this occurs. To do this, please follow
this procedure:
Disable Automatic restart after shutdown. Please remember that this feature is active by
default and so the modem will try to switch on again automatically
Close all threads
Close all sockets or internet services
Call garbage collector
Switch off modem using the AT^SMSO command
Note: the VEXT voltage will be only present when external power is applied (i.e. charging battery)
When the battery is attached, as "automatic restart" is featured by default, the modem will always
be powered on and cannot be switched off. If you need to stop the Java application when Automatic
Restart is enabled, you should press the switch button located near the SIM holder as shown in the
picture below.
www.mtx‐terminals.com
www.mtxm2m.com
MTX M2M® by MATRIX ELECTRONICA S.L.U
MTX‐3G‐JAVA Family
2015/10 v1.6
/
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