NT910G
User Manual - Telic AG
Pg 20
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EMERG_OFF to high level for t >1s on the RJ11 connector
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Turn off, or disconnect the power supply.
5.4
Using low power mode of the modem
The NT910 G terminal supports a special ultra-low power mode which can be activated or deactivated
by sending dedicated AT commands, which are described further below in this section. Please refer to
Section 5.7 Current consumption Measurements for detailed power consumption values.
Low-power-mode doesn´t work if the USB-Port is connected.
Activating the low power mode can also deactivate the RS232 Transceiver, which helps further reduce
the power consumption. In some scenarios, however, this may not be desirable, as it may lead to data
loss. Therefore, the following preconditions for using the low power mode need to be considered:
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There are no special precautions required when using a serial interface that is fully compliant
with the RS232 specification (V.24) both on the DTE and DCE. You can proceed as described in
the following sub-sections.
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If the DTR line is not available on the DTE (the M2M application), and you do not need to use
the low power mode, then the DSR pin on DCE side should be looped with the DTR pin, as
shown in the figure below. With this approach, the ultra-low-power mode will be permanently
disabled.
Figure 6: Looping the DSR with DTR pins to permanently deactivate low-power mode.
5.4.1 ENABLING THE LOW POWER MODE
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Wait until the GSM/LTE module is logged onto the GSM/LTE network
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Send the AT command AT#SLED=0 for disabling the status LED
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Send the AT command AT+CFUN=0 (section 3.1.2.26. of the AT command manual)
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Set the DTR control line from High level to Low level
NOTICE
Enabling low power mode as described herein also deactivates the RS232 transceiver!
