Figure 104. Variable Leader Data Format; Table 38: Variable Leader Data Format - Teledyne RD Instruments SENTINEL V SELF-CONTAINED Operation Manual

September 2017
BYTE 7
65
66
See Table 38 for a description of the fields.
Variable Leader data refers to the dynamic Sentinel V ADCP data (from clocks/sensors) that change with
each ping. The Sentinel V ADCP always sends Variable Leader data as output data (LSBs first).
Table 38: Variable Leader Data Format
Hex Digit Binary
Byte
1-4 1,2
5-8 3,4
9,10 5
11,12 6
13,14 7
15,16 8
17,18 9
19,22 10
21,22 11
23-24 12
Page 258
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
BIT POSITIONS
6 5 4
RTC HUNDREDTH
Figure 104. Variable Leader Data Format
Field Description
VID / Variable Stores the Variable Leader identification word (80 00h).
Leader ID
Ens / Ensemble This field contains the sequential number of the ensemble to
Number which the data in the output buffer apply.
Scaling: LSD = 1 ensemble; Range = 1 to 65,535 ensembles
NOTE: The first ensemble collected is #1. At "rollover," we have
the following sequence:
1 = ENSEMBLE NUMBER 1
↓
65535 = ENSEMBLE NUMBER 65,535 | ENSEMBLE
0 = ENSEMBLE NUMBER 65,536 | #MSB FIELD
1 = ENSEMBLE NUMBER 65,537 | (BYTE 12) INCR.
RTC Year These fields contain the time from the Sentinel V real-time clock
RTC Month (RTC) that the current data ensemble began. The TS-command
RTC Day (Set Real-Time Clock) initially sets the clock. The Sentinel V does
RTC Hour account for leap years.
RTC Minute
RTC Second
RTC Hundredths
Ensemble # MSB This field increments each time the Ensemble Number field (bytes
3,4) "rolls over." This allows ensembles up to 16,777,215. See
Ensemble Number field above.
3 2
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