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WorkHorse H-ADCP Operation Manual
May
2015
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
Page 203
Fixed Leader data refers to the non-dynamic H-ADCP data that only changes when you change certain
commands. Fixed Leader data also contain hardware information. The H-ADCP always sends Fixed Lead-
er data as output data (LSBs first).
Table 36:
Fixed Leader Data Format
Hex Digit
Binary Byte
Field
Description
1-4
1,2
FID / Fixed Leader ID
Stores the Fixed Leader identification word (00 00h).
5,6
3
fv / CPU F/W Ver.
Contains the version number of the CPU firmware.
7,8
4
fr / CPU F/W Rev.
Contains the revision number of the CPU firmware.
9-12
5,6
Sys Cfg / System
Configuration
This field defines the H-ADCP hardware configuration. Convert this field (2 bytes, LSB
first) to binary and interpret as follows.
LSB
BITS 7 6 5 4 3 2 1 0
- - - - - 0 0 0 75-kHz SYSTEM
- - - - - 0 0 1 150-kHz SYSTEM
- - - - - 0 1 0 300-kHz SYSTEM
- - - - - 0 1 1 600-kHz SYSTEM
- - - - - 1 0 0 1200-kHz SYSTEM
- - - - - 1 0 1 2400-kHz SYSTEM
- - - - 0 - - - CONCAVE BEAM PAT.
- - - - 1 - - - CONVEX BEAM PAT.
- - 0 0 - - - - SENSOR CONFIG #1
- - 0 1 - - - - SENSOR CONFIG #2
- - 1 0 - - - - SENSOR CONFIG #3
- 0 - - - - - - XDCR HD NOT ATT.
- 1 - - - - - - XDCR HD ATTACHED
0 - - - - - - - DOWN FACING BEAM
1 - - - - - - - UP-FACING BEAM
MSB
BITS 7 6 5 4 3 2 1 0
- - - - - - 0 0 15E BEAM ANGLE
- - - - - - 0 1 20E BEAM ANGLE
- - - - - - 1 0 30E BEAM ANGLE
- - - - - - 1 1 OTHER BEAM ANGLE
0 1 0 0 - - - - 4-BEAM JANUS CONFIG
0 1 0 1 - - - - 5-BM JANUS CFIG DEMOD)
1 1 1 1 - - - - 5-BM JANUS CFIG.(2 DEMD)
Example: Hex 5249 (i.e., hex 49 followed by hex 52) identifies a 150-kHz system, con-
vex beam pattern, down-facing, 30E beam angle, 5 beams (3 demods).
13,14
7
PD / Real/Sim Flag
This field is set by default as real data (0).
15,16
8
Lag Length
Lag Length. The lag is the time period between sound pulses. This is varied, and there-
fore of interest in, at a minimum, for the WM5, WM8 and WM11 and BM7 commands.
17,18
9
#Bm / Number of
Beams
The number of beams is set to 4 to maintain compatibility with existing software.
19,20
10
WN / Number of
Cells
Contains the number of depth cells over which the H-ADCP collects data (WN-
command).
Scaling: LSD = 1 depth cell; Range = 1 to 128 depth cells
21-24
11,12
WP / Pings Per En-
semble
Contains the number of pings averaged together during a data ensemble (WP-
command). If WP = 0, the H-ADCP does not collect the WD water-profile data. Note:
The H-ADCP automatically extends the ensemble interval (TE) if the product of WP and
time per ping (TP) is greater than TE (i.e., if WP x TP > TE).
Scaling: LSD = 1 ping; Range = 0 to 16,384 pings
25-28
13,14
WS / Depth Cell
Length
Contains the length of one depth cell (WS-command).
Scaling: LSD = 1 centimeter; Range = 1 to 6400 cm (210 feet)