Users Manual Part 1

FOX3-2G/3G/4G HARDWARE MANUAL VERSION 2.2.5
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Modes
Description
supported only with $PFAL,Sys.Device.Doze.
LowBat=3.6
Device wakes up when the battery voltage drops below the specified value
IMPORTANT: The sleep and wake-up procedures are quite different depending on the selected sleep mode.
Please note that the power saving with "Ring" works properly only when the 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 error "ring shutdown aborted due to bad GSM
coverage" and the power saving does not take place.
NOTE: Related to the battery-powered devices only:
When activating any sleep mode, make sure that the internal battery has enough power to safely
wake up the device from that sleep mode. If the internal battery does not have enough power, the
device can not complete the wake up process.
6.2. Determining the External Equipment Type
Before you connect the serial port pins of the FOX3-2G/3G/4G devices to an external equipment, you need to
determine if the external hardware serial ports are configured as DTE (Data Terminal Equipment) or DCE (Data
Communications Equipment).
FOX3-2G/3G/4G are designed for use as DCE devices. Based on the conventions for DCE-DTE connections, it
communicates with the customer application (DTE) using the following signals:
FOX3-2G/3G/4G Terminal (DCE) to Application (DTE)
RxA
<----------
TXD
TxA ----------> RXD
GND
-
GND
Table 6: The signaling definitions between DTE and DCE.