Instruction manual
19
857-164777 / A
$PSIMMW,xxxx.x,M,xxxx.x,M,yyy.y,T,z.z,M,y.y,D,c,hhmmss*hh<cr><lf>
xxxx.x,M slant range in metres to middle weight (clump)
- filtered values.
xxxx.x,M horizontal range in metres to middle weight
- unfiltered values
- nullfields if depth-sensor not activated (will calculate
horizontal range with manual set depth).
yyy.y,T true bearing (deg.rel.north) to middle weight
- requires gyro input for reliable data.
z.z,M signed deviation in metres (if deviation positive, then middle
weight further out than door-door line)
- an offset to the deviation may be set in the trawl setup in order
to get the deviation near zero when the trawlgeometry isideal.
A positive offset will shorten the mid weight wire
- a mid weight filter, filtering the signed deviation, is found in
the trawl setup.
About the mid weight filter:
- the mw filter calculates from unfiltered horizontal ranges for
mw filter setting of 1 to 5 and if active depth sensor on trawl
- the mw filter calculates from filtered horizontal ranges for
mw filter setting of 6 to 10 and active depth sensor on trawl
- the mw filter calculates from filtered slant ranges if no active
depth sensor on trawl.
y.y,D “starboard angle” between true GPS course (or heading if no
GPS) and the “Door-Door Line” of the trawl (0
°
< y.y < 180
°
).
c status of data, primarily middle weight deviation status
A:
OK
B:
OK but ambiguous
(
±
on deviation, presented range complies with positive
deviation, i.e. the larger range possibility)
C:
Uncertain (angle based calculations)
D:
Uncertain and ambiguous
E:
Invalid data, required sensors not active
V:
Invalid data, throw away
W:
Invalid and ambiguous.
hhmmss time of transmission
(time of Middle weight deviation calculations)
- requires ZDA input from GPS for accurate timestamP.
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