10.2 Command Set 77
t = number of satellites being actively tracked (up to twelve)
P = Off, indicates that the time dilution of precision (TDOP)
calculation is not being performed. Returns 1.0 - 99.0, depending
on satellite geometry, when TDOP calculation is being performed.
A TDOP calculation is NOT performed if less than 3 satellites are
visible, OR if Position-Hold is active. E = 0, currently unused.
Survey Status
Command: SQ
SQ returns Auto-Survey mode data. For a survey in progress, it returns current status of the
survey. For a completed survey, it returns the final results of the survey, i.e. the averaged position.
Response: Sn Pm Fnnnnn #nnnnn Tyyyy:dd:hh:mm:ss Eddd:mm:ss.sss Ndd:mm:ss.sss Hmmmmm.mm
C
Format: Sn = status of the Auto-Survey mode
Pm = status of the Position-Hold mode
Fnnnnn = current number of fixes
#nnnnn = total number of fixes required
yyyy:ddd:hh:mm:ss = completion time of the most recent average
Eddd:mm:ss.sss = surveyed longitude
Ndd:mm:ss.sss = surveyed latitude
Hmmmmm.mm = surveyed elevation
Table 10.6 columns on the left show the significant three bits of the Auto Survey status byte,
weighting and assignments. On the right, columns show the significant three bits of the Position
Hold status byte, weighting and assignments.
Bit Weight Function Bit Weight Function
0 (LSB) 1 Single Auto Survey 0 (LSB) 1 Position Hold Enabled
1 2 Power-On Survey 1 2 Position Hold Active
2 4 Suspend Survey 2 4 Position Hold ID:*
3–7 N/A – 3–7 N/A –
Table 10.6: Survey (Sn) / Position-Hold Status (Pm)
*0=surveyed, 1=User-entered
The remainder of the information is the running position average, including all fixes since the
beginning of the Auto Survey cycle. Gives latitude and longitude in degrees, minutes and seconds.
Indicates E, W, N, and S respectively as East or West longitude and North or South latitude, and
H indicating elevation in meters WGS–84 (World Geodetic Survey, 1984).
System Status
Command: SS
SS returns the instrument operation status whenever the status changes. See Table 10.5 for bit
assignments of clock conditions.
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