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LTE Terminals Hardware Interface Description
3.9 Power Up/Power Down Scenarios
47
ELSxT_HID_v04 2018-09-04
Confidential / Preliminary
Page 43 of 102
Emergency restart:
• Finally, LTE Terminals can be reset/restarted in the event of software hang-ups etc. by
applying a voltage >8V to the RST_IN pin (pin 3) for more than 10ms.
The RST_IN signal then restarts the LTE Terminals.
Caution: Use the RST_IN pin only when, due to serious problems, the software is not
responding for more than 5 seconds. Pulling the RST_IN pin causes the loss of all informa-
tion stored in the volatile memory since power is cut off immediately. Therefore, this proce-
dure is intended only for use in case of emergency, e.g. if LTE Terminals fails to shut down
properly.
3.9.3 Turn LTE Terminals off
Normal shutdown:
• To turn off the LTE Terminals use the AT^SMSO command, rather than disconnecting the
mains adapter.
This switch off procedure lets the LTE Terminals log off from the network and allows the
software to enter a secure state and save data before disconnecting the power supply. After
AT^SMSO has been entered the LTE Terminals returns the following result codes:
^SMSO: MS OFF
OK
^SHUTDOWN
The "^SHUTDOWN" result code indicates that the LTE Terminals turns off in less than
1 second. After the shutdown procedure is complete the LTE Terminals enters the Power
Down mode. The yellow LED stops flashing (see Section 3.14 for a detailed LED descrip-
tion). The RTC is still fed from the voltage regulator in the power supply ASIC. Please note
that if employing PoE (see Section 3.8), the module will restart automatically after a normal
shutdown.The module will also restart if Alway On is configured (see Section 8.3.1.8)
3.9.4 Disconnecting power supply
Before disconnecting the power supply from the PLUS pin, make sure that the LTE Terminals
are in a safe condition. The best way is to wait 1s after the "^SHUTDOWN" result code has
been indicated.
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