User`s guide

Chapter 5 - I/O Commands
ALMANAC DATA REQUEST (@@Be) (RESPONSE IS Cb)
Motorola Binary Format
Query Current Almanac Data:
@@BemC<CR><LF>
where:
m = response mode 0x00 = Output response message once (polled)
0x01 = Output response message when almanac
data changes (continuous)
C = checksum
Message length: 8 bytes
Response to above command:
@@Cbsp xxx xxx xxx xxx xxx xxx xxx xxx C<CR><LF>
where:
sp = subframe/page subframe 5 / pages 1-25,
or subframe 4 / pages 2-5, 7-10, 25
xxx = data words words 3-10, each word is 3 bytes long (format per ICD-
GPS-200)
C = checksum
Message length: 33 bytes
NOTES:
1. If an almanac is present in the GPS receiver, the receiver outputs all of the almanac
pages as shown above. Otherwise, it returns a @@Cb output message with all data
bytes set to zero.
2. The spaces in the response message shown above have been added merely to increase
readability. There are no embedded spaces in the actual message sent out by the M12+
receiver.
Motorola GPS Products - M12+ User's Guide Revision 6.X 09FEB05
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