Sentinel V SC and RT Operation Manual
September
2017
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
Page 255
Table 37:
Fixed Leader Data Format
Binary
Byte
Field
Description
27,28
Heading
Alignment
Contains a correction factor for physical heading misalignment (EA command).
Scaling: LSD = 0.01 degree; Range = -179.99 to 180.00 degrees
29,30
Heading Bias
Contains the Magnetic Bias from the Compass Configuration.
Scaling: LSD = 0.01 degree; Range = -179.99 to 180.00 degrees
31
Sensor Source Contains the selected source of environmental sensor data. These firmware
switches indicate the following.
FIELD DESCRIPTION
x1xxxxxx = Calculates Speed of Sound from Depth, Salinity, & Temp
xx1xxxxx = USES DEPTH SENSOR
xxx1xxxx = USES TRANSDUCER HEADING SENSOR
xxxx1xxx = Not used
xxxxx1xx = Not used
xxxxxx1x = Not used
xxxxxxx1 = Not used
The first three flags will be set.
32
Sensor Avail
This field reflects which sensors are available. The bit pattern is the same as listed
above for byte 31.
33,34
dis1 / Bin 1
distance
This field contains the distance to the middle of the first depth cell (bin). This
distance is a function of depth cell length, the profiling mode, the blank after
transmit distance, and speed of sound.
Scaling: LSD = 1 centimeter; Range = 0 to 65535 cm (2150 feet)
35,36
Xmit pulse
length
This field contains the length of the transmit pulse.
Scaling: LSD = 1 centimeter; Range = 0 to 65535 cm (2150 feet)
37,38
WP Ref Lyr Avg
(Starting cell,
Ending cell)
Contains the starting depth cell (LSB, byte 37) and the ending depth cell (MSB, byte
38) used for water reference layer averaging (WL command).
Scaling: LSD = 1 depth cell; Range = 1 to 128 depth cells
39
False Target
Threshold
Contains the threshold value used to reject data received from a false target, usu-
ally fish. The value for this field is always 255.
Scaling: LSD = 1 count; Range = 0 to 255 counts (255 disables)
40
Spare
Spare
41,42
LagD /
Transmit lag
distance
This field contains the distance between pulse repetitions.
Scaling: LSD = 1 centimeter; Range = 0 to 65535 centimeters
43-50
Spare
Spare
51-52
System
Bandwidth
Set to 0 for high bandwidth (24%), 1 for low bandwidth (6/25%). Range = 0 to 1
53
System Power
The value for this field is always 255. Range 0 to 255.
54
Spare
Spare
55-58
Serial #
Instrument serial number
59
Beam Angle
Beam angle
60
Spare
Spare
