Marport Scala2, User Manual

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Scala2 | Version 5 | Appendix
Sentence Format
First compliant
version
of Scala2
WTE - Scantrol
winch tension
(quad trawl -
center clump)
$SCWTD,a.a,T*hh<CR><LF>
1. $SCWTD: Talker iden sentence formatter*
2. a.a,T: tension in tons*
3. *hh: Checksum*
2.0.0.0
NMEA Outputs from Scala2
Scala2 can output data in the following formats.
Marport's proprietary sentence
Scala2 uses the following sentence to output sensor data:
$MPMSD, X, YY, ZZZ, TTT, u, VV.VVV*<chk>
1. $MP
: Talker identifier
2. MSD : Sentence formatter (Marport Sensor Data)
3. X, YY, ZZZ : location of the emitting sensor on the trawl gear
4. TTT : type of sensor data
5. u : acronym of the unit
6. VV.VVV : decimal value
7. *<chk> : checksum. The checksum is a security measure to ensure that the sentence is
transmitted accurately. The checksum follows the NMEA specifications (IEC 61162-1 Ed.4).
The following sections give more details about the contents of the sentence.
Sensor location
X, YY, ZZZ specifies the location of the emitting sensor on the trawl gear.
•
X : 1 or 2 letters indicating on which gear the sensor is installed. This is useful only for twin or
triple trawl gears.
• YY : 2 letters indicating the part of the gear where the sensor is installed.
• ZZZ : numerical code that is a Marport sensor node identifier related to the Mx receiver
configuration. It is used in Scala2 to position the sensors in the 3D views.
Type of gear Gear position X
Single T
Twin trawl Starboard ST
Twin trawl Port PT
Triple trawl Starboard ST
Triple trawl Middle MT
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