Motorola M12 Oncore User Manual page 102

Motorola GPS Products
M12 Oncore User' s Guide Supplement
Revision 1.0 01/25/00
GPRMC
(RECOMMENDED MINIMUM SPECIFIC GPS/TRANSIT DATA)
This command enables the GPRMC Recommended Minimum Specific GPS/Transit
Data message and determines the rate at which the information is transmitted. The
periodic rate field (yyyy) instructs the receiver either to output this message once
(polled), or to output this message at the indicated update rate (continuously).
Once the receiver is set to continuous output, the continuous flow can be stopped
by sending a one-time (polled) output request. The receiver will output the response
one final time, and then terminate any further message outputs. The value of the
periodic rate is retained through a power cycle only if battery backup power is
applied.
If the receiver has just powered up and has yet to compute a position fix (status
field (a) is be invalid), then the time (hhmmss.ss) and date (ddmmyy) fields will be
nulled. If the receiver is not computing a position fix sometime after the first fix
(status field (a) is invalid), then the time (hhmmss.ss) and date (ddmmyy) fields will
be frozen. If the receiver is not computing a position fix (status field (a) is invalid),
then the speed over ground (z.z) and track made good (y.y) fields will be nulled.
NOTE: The magnetic variation field (d.d) will always be null since the M12 Oncore
does not have this information.
Default mode: Disabled
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