ATLAS North America Proprietary
Sea Scan ARC Scout MKII Operations Manual
1 of 1
Page: 42
Issue: 1.2.4
SCTM2-OPS
Operations Manual
6.3.2.3
SOS
The proprietary SOS string allows the speed of sound in water to be sent to the Scout MkII. The default
internal speed of sound in water is set to 1500 m/s. This string allows the speed of sound in water to be
updated dynamically. The default speed of sound for the Scout MkII is 1500 m/s.
Example:
$MSSOS,<speed of sound>*hh<CR><LF>
Format Description:
Name
Example
Units
Description
Start Of String
$
$ indicates start of string
Message ID
MSSOS
Marine Sonic SOS string
identifier
Speed of Sound
<speed of sound>
meters per second
One way speed of sound in
water (1400 m/s to 1600 m/s)
Checksum Delimeter
*
The checksum comes after
this character.
hh
2 Digit Hexadecimal
Checksum of the entire string.
Sentence Terminator
<CR><LF>
Indicates end of sentence.
6.3.2.4
SYNC
The SYNC string allows the host computer to set the Scout MkII's real time clock. The Embedded system
starts up with the time of January 1st 1990 12:00 A.M. It is recommended that the time be set after the
system has booted. The time is encoded as the number of decimal seconds since the EPOCH (January 1st
1970). This time (down to 1 second resolution) is commonly returned by the time( ) function available on
most computing systems. Time down to 2 or more decimal seconds can be calculated. This command is
provided for easier and quicker time/date encoding.
Example:
$MSSYNC,<decimal seconds>*hh<CR><LF>
Format:
Name
Example
Units
Description
Start Of String
$
$ indicates start of string
Message ID
MSSYNC
Marine Sonic SYNC string
identifier
GMT Time
<decimal seconds>
Decimal Seconds
Decimal seconds since the
EPOCH (January 1st, 1970).
Usually returned by the time()
function. Up to 6 decimal
places can be specified.
Checksum Delimeter
*
The checksum comes after
this character.
10
2 Digit Hexadecimal
