DISCO-B4-GLONASS H
ARDWARE
M
ANUAL
V
ERSION
1.0.3
5.1.3 Power saving
SLEEP mode reduces the functionality of the modules of the
DISCO-B4-GLONASS
device to a
minimum and thus minimizes the current consumption to the lowest level. Settings for activating
one of the supported low power modes can be made using the
$PFAL,Sys.Device.Sleep
command.
For details, see example in table below.
Following SLEEP modes are supported by the DISCO-B4-GLONASS device:
Modes
Description
IGN
Device goes to sleep and wakes up when IGN (pin 3 - blue color) changes its digital level from
Low to High (performs a rising edge).
Ring
Device goes to sleep and wakes up when the GSM module receives a voice call or an SMS.
Timer
=1:20:00
Device goes to sleep and wakes up after the defined time has expired.
Motion
=5,20,20
Device goes to sleep and wakes up when motion is detected.
ExtPwrDetect
Device goes to sleep and wakes up when external power (higher than 9 V) is connected to the
device.
ExtPwrDrop
Device goes to sleep and wakes up when external power is disconnected or it drops below 8 V.
AiWu
=5.1,12
Device goes to sleep and wakes up when the voltage on I/O1 (pin 4 used as analog input)
exceeds the defined upper or lower threshold.
Example
$PFAL,Sys.Device.Sleep=
IGN+Ring+Timer
=1:20:00
IMPORTANT:
The sleep and wake-up procedures are quite different depending on the selected
sleep mode. Please keep in mind that the power saving with "
Ring
" parameter
works properly only when PIN authentication has been done and the device is
already registered in the GSM network. If you attempt to activate power saving
while the device is not registered in the GSM network, the SIM card is not inserted
or the PIN not correctly entered, the device responds with an error "
ring shutdown
aborted due to bad GSM coverage
" and the power saving does not take place. For
more
details,
refer
to
the
manual
"steppIII_FOX-
LT_bolero_lt_PFAL_Configuration_Command_Set.pdf".
NOTE
(This note is related to the battery-powered devices only): The internal battery of the DISCO-
B4-GLONASS must have enough power to safely wake up the device from a sleep mode. If the
internal battery of the DISCO-B4-GLONASS device does not have enough power, the device
cannot complete the wake up operation.
5.2 Determining the External Equipment Type
Before you connect the serial port pins on the aforementioned terminals (DCE units) to external
equipment, you need to determine if the external hardware serial ports are configured as DTE or
DCE.
DISCO-B4-GLONASS is designed for use as a DCE device. Based on the aforementioned conventions
for DCE-DTE connections, it communicates with the customer application (DTE) using the following
signals:
DISCO-B4-GLONASS Terminal (DCE)
to
Application (DTE)
RxA
<----------
TXD
TxA
---------->
RXD
Table 4:
The signalling definitions between DTE and DCE.
This confidential document is a property of FALCOM and may not be copied or circulated without previous permission.
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