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Extended AT Commands Manual Page 23 of 70 2009-06-25
5.3.1.1. SMS low battery voltage set point (AT$$LOWBATT_VTG)
This command also sets the SMS Auto Voltage Alert value. (For remote user SMS notification
activation please see SMS Auto Voltage Alert
).
Table 5-28 Read command
Command TE2
Æ
MT2 $$LOWBATT_VTG?
Response TE2
Å
MT2 $$LOWBATT_VTG: <value1>
Value1
610: Default – voltage point set for $$LOWBATT 1 notification
xxxx: 4 digit number representing voltage to 2 decimal points x100 (i.e. 12.8
volts would be represented as 1280, 9VDC would be 0900)
Value range is from 0910 to 3600.
E
: If the first di
g
it entered is a zero it is ignored in the response.
Table 5-29 Set command
Command TE2
Æ
MT2 $$LOWBATT_VTG=<value>
Response TE2
Å
MT2
$$LOWBATT_VTG: <value>
<result_code> (OK | ERROR)
5.3.1.2. Low battery notification (AT$$LOWBATT)
Table 5-30 Notification command
Notify TE2
Å
MT2 $$LOWBATT: <value>
Value
0: normal state (voltage above 9.1VDC or that set by $$LOWBATT_VTG)
1: Low Battery (voltage has dropped to the point set at $$LOWBATT_VTG)
2: Power-off sequence initiated - battery voltage has reached 5.8VDC
NOTE: When the power supply to MT2 reaches 9.1 volts the modem will power up and send a $$LOWBATT 1 notification to TE2. It
does not send SMS alert at this time. SMS alert is automatically reinstated once the voltage exceeds the $$LOWBATT 1 set
point PLUS 10% as seen by the modem.
The following shows MT2’s responses against the battery level.
Table 5-31 Responses
Battery Level MT2
Batt level=1
a) Notifies TE2 with AT: $$LOWBATT:1
b) Notifies local user: buzzer
(repetition approx every 2 minutes)
c) Notifies with MO SMS if enabled
Batt level=2
Transmits $$LOWBATT:2 to TE2
Executes MT2 power-down sequence
NOTE: Tolerance of voltage readings is +/-0.4V on average.
NOTE: Modem will auto power up once supply voltage reaches 6.5VDC.