Table 37: Variable Leader Data Format - Teledyne WORKHORSE Operation Manual

May 2015
Variable Leader data refers to the dynamic H-ADCP data (from clocks/sensors) that change with each
ping. The H-ADCP always sends Variable Leader data as output data (LSBs first).
Table 37: 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
25-28 13,14
29-32 15,16
33-36 17,18
37-40 19,20
41-44 21,22
45-48 23,24
Page 208
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
Field Description
VID / Variable Leader Stores the Variable Leader identification word (80 00h).
ID
Ens / Ensemble Num- This field contains the sequential number of the ensemble to which the data in the
ber 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 se-
quence:
1 = ENSEMBLE NUMBER 1
↓
65535 = ENSEMBLE NUMBER 65,535 | ENSEMBLE
0 = ENSEMBLE NUMBER 65,536 | #MSB FIELD
1 = ENSEMBLE
RTC Year These fields contain the time from the H-ADCP's real-time clock (RTC) that the cur-
rent data ensemble began. The TS-command (Set Real-Time Clock) initially sets the
RTC Month
clock. The H-ADCP does account for leap years.
RTC Day
RTC Hour
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.
BIT / BIT Result This field contains the results of the H-ADCP's Built-in Test function. A zero code
indicates a successful BIT result.
BYTE 13
1xxxxxxx xxxxxxxx = RESERVED
x1xxxxxx xxxxxxxx = RESERVED
xx1xxxxx xxxxxxxx = RESERVED
xxx1xxxx xxxxxxxx = DEMOD 1 ERROR
xxxx1xxx xxxxxxxx = DEMOD 0 ERROR
xxxxx1xx xxxxxxxx = RESERVED
xxxxxx1x xxxxxxxx = TIMING CARD ERROR
xxxxxxx1 xxxxxxxx = RESERVED
EC / Speed of Sound Contains either manual or calculated speed of sound information (EC-command).
Scaling: LSD = 1 meter per second; Range = 1400 to 1600 m/s
ED / Depth of Trans- Contains the depth of the transducer below the water surface (ED-command). This
ducer value may be a manual setting or a reading from a depth sensor.
Scaling: LSD = 1 decimeter; Range = 1 to 9999 decimeters
EH / Heading Contains the H-ADCP heading angle (EH-command). This value may be a manual
setting or a reading from a heading sensor.
Scaling: LSD = 0.01 degree; Range = 000.00 to 359.99 degrees
EP / Pitch (Tilt 1) Contains the H-ADCP pitch angle (EP-command). This value may be a manual setting
or a reading from a tilt sensor. Positive values mean that Beam #3 is spatially higher
than Beam #4.
Scaling: LSD = 0.01 degree; Range = -20.00 to +20.00 degrees
ER / Roll (Tilt 2) Contains the H-ADCP roll angle (ER-command). This value may be a manual setting
or a reading from a tilt sensor. For up-facing H-ADCPs, positive values mean that
Beam #2 is spatially higher than Beam #1. For down-facing H-ADCPs, positive values
mean that Beam #1 is spatially higher than Beam #2.
Scaling: LSD = 0.01 degree; Range = -20.00 to +20.00 degrees
WorkHorse H-ADCP Operation Manual
NUMBER 65,537 | (BYTE 12) INCR.
BYTE 14
(BYTE 14 RESERVED FOR FUTURE USE)