Motorola M12 Oncore User Manual page 45

Input Command
Response Message
Motorola GPS Products
M12 Oncore User' s Guide Supplement
Revision 1.0 01/25/00
ALMANAC STATUS
Motorola Binary Format
• Request Almanac Status Command:
@@BdmC<CR><LF>
m mode
C checksum
Message Length: 8 bytes
• To above command:
@@BdvwtassssrrrrrrrrC<CR><LF>
RAM Almanac Status
v almanac valid flag
w almanac week number (raw)
t time of almanac (raw)
a number of available SVs
ssss SVs in almanac
32 bit binary field,
each bit represents one SVID
(msb = SVID 32; lsb = SVID 1)
rrrrrrrr reserved
C checksum
Message Length: 23 bytes
0 = Output status once (polled)
1 = Output status when RAM almanac data
changes (continuous)
0 = no almanac in receiver
1 = valid almanac in receiver
0 .. 255 (ICD-GPS-200)
0 .. 147 (ICD-GPS-200)
0 .. 32
0 = SV not available
1 = SV included
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