SE867-AGPS User Guide
1VV0300860 Rev. 3 - 2010-05-10
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved
page 33 of 69
If the NMEA string can be decoded to explicit command for the SE867-AGPS, the same
message will be echoed back to sender.
According to the NMEA standard the maximum number of characters between the
starting delimiter ‘$’ or ‘!’ and the terminating <CR><LF> should be 79, i.e. the
maximum buffer size should be 82 for one sentence.
For the custom NMEA messages the maximum size of the input messages is 128
characters and for the output messages 200 characters.
10.1.2.1.
ASSIST
With ASSIST command the user can inject time assistance into the navigation software.
The format of ASSIST command is the following:
$PUNV,ASSIST,
hhmmss.ss
,
ddmmyy
*cc
hhmmss.ss
is the UTC time:
hh
– hours (00…23),
mm
– minutes (00…59),
ss.ss
–
seconds (00.00…59.99)
ddmmyy
is the UTC date:
dd
– day (01…31),
mm
– month (01…12),
yy
– year (00…99)
$PUNV,ASSIST,
tow
,
wn
*cc
tow
is time of the week in milliseconds (0…604699999) and
wn
is a week number
(starting from January 6, 1980).
10.1.2.2.
STORELGF
With STORELGF command the user can force immediate LGF storage.
$PUNV,STORELGF*23
10.1.2.3.
START
With START command the user can restart the navigation and erase different kind of
data at the same time.
$PUNV,START,
bitmask
*cc
bitmask
is a hexadecimal number (without ‘0x’ prefix) specifying the data to be erased.
