M12 Oncore Users Guide Supplement - deetc - isel
M12 Oncore Users Guide Supplement - deetc - isel M12 Oncore Users Guide Supplement - deetc - isel
Motorola GPS Products M12 Oncore User’s Guide Supplement Revision 1.0 01/25/00 GPGSA (GPS DOP AND ACTIVE SATELLITES) This command enables the GPGSA GPS DOP and Active Satellites 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 is not computing a position fix (mode field (b) is one), then the xDOP fields (p.p, q.q, r.r) will be nulled. If the receiver is computing a 2-D position fix (mode field (b) is two), then the PDOP field (p.p) and the VDOP field (r.r) will be nulled. Only satellite IDs used in the solution are output; the remaining satellite ID fields will be nulled. Default mode: Disabled 98
Input Command Response Message Motorola GPS Products M12 Oncore User’s Guide Supplement Revision 1.0 01/25/00 GPGSA (GPS DOP AND ACTIVE SATELLITES) NMEA-0183 Format • Set response message rate: $PMOTG,GSA,yyyyCC yyyy update rate 0 .. 9999 seconds CC optional checksum • To above command: $GPGSA,a,b,cc,dd,ee,ff,gg,hh,ii,jj,kk,mm,nn,oo, p.p,q.q,r.r*CC a sat acquisition mode M = manual (forced to operate in 2D or 3D mode) A = automatic (auto switch 2D/3D) b positioning mode 1 = fix not available 2 = 2D 3 = 3D cc, dd, ee, ff, gg, hh, ii, jj, kk, SVIDs used in solution (null for unused fields) mm, nn, oo p.p PDOP 1.0 .. 9.9 q.q HDOP 1.0 .. 9.9 r.r VDOP 1.0 .. 9.9 CC checksum 99
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Motorola GPS Products<br />
<strong>M12</strong> <strong>Oncore</strong> User’s <strong>Guide</strong> <strong>Supplement</strong><br />
Revision 1.0 01/25/00<br />
GPGSA (GPS DOP AND ACTIVE SATELLITES)<br />
This command enables the GPGSA GPS DOP and Active Satellites message and<br />
determines the rate at which the information is transmitted. The periodic rate field<br />
(yyyy) instructs the receiver either to output this message once (polled), or to<br />
output this message at the indicated update rate (continuously). Once the receiver is<br />
set to continuous output, the continuous flow can be stopped by sending a one-time<br />
(polled) output request. The receiver will output the response one final time, and<br />
then terminate any further message outputs. The value of the periodic rate is<br />
retained through a power cycle only if battery backup power is applied.<br />
If the receiver is not computing a position fix (mode field (b) is one), then the xDOP<br />
fields (p.p, q.q, r.r) will be nulled. If the receiver is computing a 2-D position fix<br />
(mode field (b) is two), then the PDOP field (p.p) and the VDOP field (r.r) will be<br />
nulled. Only satellite IDs used in the solution are output; the remaining satellite ID<br />
fields will be nulled.<br />
Default mode: Disabled<br />
98
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