User's Manual

URD1 – OTL 5696.1– 022 / 72740 Edition 0.4 HILONC- 3GPS APPLICATION NOTE
4.4.1. UART Interface
To turn the module off, use the AT command AT+CPOF. If
PWON
is not pulled down the module will switch to
OFF mode after the AT command, otherwise the module restarts immediately (OFF sequence is performed
followed by power ON sequence).
: Power off sequence for PWON, VGPIO and UART_RTS
4.4.2. USB Interface
As the module can also be turned on when a USB cable is plugged in, the module turn off sequence requires
the USB interface to be OFF or VBUS disconnected once the command is sent and acknowledged by the
module. Thus, to turn the module off when USB interface is in use, use the AT command AT+CPOF, then
disconnect VBUS signal (unplug the USB cable or use a command switch to switch off VBUS) when the module
acknowledges (responds with an OK message) the command, otherwise the module will restart immediately (an
OFF sequence is performed followed by a power ON sequence).
4.5. Sleep Mode
The AT command AT+KSLEEP allows configuration of the sleep mode.
When AT+KSLEEP=1 has been configured:
· The
HILONC-3GPS module decides by itself when to enter sleep mode (no tasks running).
· “0x00” character on serial link wakes up the
HILONC-3GPS module.
When AT+KSLEEP=0 has been configured:
· The
HILONC-3GPS module is active when
UART_DSR
signal is active (low electrical level).
· When UART_DSR
is deactivated (high electrical level), the HILONC-3GPS module enters sleep mode after a
certain period of time.
· On UART_DSR
activation (low electrical level), the HILONC-3GPS module wakes up.
When AT+KSLEEP=2 has been configured:
· The
HILONC-3GPS module is prevented from ever entering sleep mode.
In sleep mode the module reduces power consumption and waits for a wake up signal from either the network,
Note d’étude / Technical document :
01/08/20111 - Page 23 / 41