Echotrac MKIII Operator's Manual 4.06
Page 37 of 48
January 21, 2019
7.1.3 DESO COMMANDS
The following DESO commands are supported when a DESO output string is selected:
-
TXx…80 characters max…xCL
example: TXthis is a test
-
VSsxx.xx_m/sCL
example: VS+01.23 m/s
-
EMxCL
example: EM0, EM1, EM2 or EM3
-
*CL
Terminator command
x = single character
s = sign “-“ or “+”
C = Carriage Return
L = Line Feed
_ = space
_m = units stated as meters [m]
ft.
= units stated as feet [ft.]
7.1.4 NMEA DBS
The following description applies to the selection of
NMEA DBS
with the high frequency active.
OUTPUT format:
Char. #
Description
1 – 7
$SDDBS,
Depth in feet. Single decimal floating point number.
,f,
Depth in meters. Single decimal floating point number.
,M,
Depth in fathoms. Single decimal floating point number.
,F*
8 bit hexadecimal value checksum calculated over the entire string excluding the
leading ‘$’
Carriage return
Line Feed
Example:
$SDDBS,29.1,f,8.9,M,4.8,F*36<CR><LF>
7.2 Serial Data Input / Chart Annotation
Information that in the past was handwritten on the chart record can be transmitted to the Echotrac via the RS232
return line (ASCII Serial Input). Up to 80 ASCII characters per line can be accommodated.
Event Line (
Fix Mark)
A single line across the chart is produced by sending HEX 06 (ASCII "ACK" or "Control F"). An event line will be printed
across the chart at the end of the current sounding cycle and will not delay or interfere with normal operation of the unit.
Event Annotation
When required, the event line can be annotated with up to 80 characters of information. This is achieved by following
the HEX 06 with HEX 01 (ASCII "SOH" or "Control A"). Once the HEX 02 is transmitted, annotation characters can
be sent sequentially or with breaks between characters. The ASCII string should be delimited by a HEX 04 (ASCII
"EOT" or "Control D"). This will cause the annotation to be printed and will return the Echotrac to normal operation.
Event annotation must contain at least one character before the HEX 04 delimiter even if it is only
a HEX 20 ("space"). Care should also be taken to avoid annotation overrun, which is caused by
grouping annotated events so closely together that they obscure the record.
Summary of Contents for Echotrac MKIII
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