SE867-AGPS User Guide
1VV0300860 Rev. 3 - 2010-05-10
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved
page 35 of 69
$PUNV,START,AUTO*52
and
$PUNV,START,0*6D
commands.
10.1.2.4.
SLEEP
With the SLEEP command the user can put the system into the sleep mode. The system
stays in the sleep mode until it is forced to wake up by activity on UART0 or after a
specified timeout.
The NMEA command for the sleep mode without timeout is:
$PUNV,SLEEP,
bitmask
*cc
bitmask
is a hexadecimal number (without ‘0x’ prefix) specifying the data to be erased
and has the same set of possible values as for START command described in 10.1.2.3.
SLEEP command in its simplest form is also supported:
$PUNV,SLEEP*7E
,which effectively equals to
$PUNV,SLEEP,0*62
The NMEA command for sleep mode for a predefined time has the following form:
$PUNV,SLEEP,
hh
,
mm
,
ss
*cc
hh
is hours (00…24)
mm
is minutes (00…59)
ss
is seconds (00…59).
The total sleeping time specified should be less than 90000 seconds.
Please note that the specified sleep time determines exactly the period of time, when
power consumption of single-chip GPS receiver stays low. If measuring sleep time by
watching NMEA stream, it might be several seconds longer due to processing overhead