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SERIAL OUTPUT STRING FORMATS

APPENDIX C – SERIAL OUTPUT STRING FORMATS

C.1 Echotrac SBT (for depth)

Table 11 applies to the selection of Single Bottom Tracking (SBT) with one frequency (high or low) active.

Table 11: Echotrac SBT

Character # Character Description
1 <sp>, F Normally a space, “F” = Fix mark
2-3 et, ET Unit indicator: “et” = centimeters, “ET” = tenths of feet
4 <sp>, E Normally a space, “E” = error
5 <sp> Always a space
6 D Depth data (MSD)

7 D Depth data
8 D Depth data
9 D Depth data
10 D Depth data (LSD)
11 CR Carriage return

Example: <sp>et<sp><sp>DDDDD<CR>
= <sp>et<sp><sp>02035<CR>
= 02035cm

For both single- and dual-frequency operation, the SBT string is generated until another
string is selected on the Sensor tab (see section 4.4.2 Auxiliary Sensors). If the system

is operating in dual frequency with SBT selected, the high-frequency depth is generated.

C.2 Echotrac DBT (for depth)

Using a single frequency
Table 12 applies to the selection of Dual Bottom Tracking (DBT) with one frequency (high or low) active.

Table 12: Echotrac DBT with One Frequency Active
Character # Character Description
1 <sp> Always a space
2-3 et, ET Unit indicator: “et” = centimeters, “ET” = tenths of feet
4 <sp>, E, ONormally a space, “E” = high frequency error, “O” = low frequency error
(missed return)
5 H, L Frequency indicator: “H” = high, “L” = low
6 <sp> Always a space
7 D Depth data (MSD)
8 D Depth data
9 D Depth data

10 D Depth data
11 D Depth data (LSD)
12 CR Carriage return

Example: <sp>ETOL<sp>DDDDD<CR>
= <sp>ETOL<sp>54321<CR>
= Low freq. error, 54321dft

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