GUIDANCE MARINE CyScan, Installer'S Manual, Page: 38 / 62

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DP Message Types
NMEA0183R Format
A 42-character string:
$RLS,±AAA.AA,±BBB.BB,S
1
,XXX.XXX,S
2
,HHHH*CC<CR><LF>
Where:
•
$RLS message header
•
AAA.AA resolved raw position in A axis [metres]
•
BBB.BB
resolved raw position in B axis [metres]
•
S
1
status of position data in A and B axis, A - available; V - void
•
XXX.XXX resolved bearing of vessel with respect to A axis [degrees]
•
S
2
status of bearing data, A - available; V - void
•
HHHH status word in hexadecimal. Up to 16 bits defined by Guidance Marine in a
separate specifications document
•
CC computed checksum in hex
•
<CR> Carriage return (ASCII 0D hex)
•
<LF> Line feed (ASCII 0A hex)
NMEA0183P Format
A 42 character string:
$RLS,±AAA.AA,±BBB.BB,S
1
,XXX.XXX,S
2
,HHHH*CC<CR><LF>
Where:
•
$RLS
message header
•
AAA.AA resolved primary position in A axis [metres]
•
BBB.BB resolved primary position in B axis [metres]
•
S
1
status of position data in A and B axis, A - available; V - void
•
XXX.XXX resolved bearing of vessel with respect to A axis [degrees]
•
S
2
status of bearing data, A - available; V - void
•
HHHH
status word in hexadecimal. Up to 16 bits defined by Guidance Marine in a
separate specifications document.
•
CC computed checksum in hex
•
<CR> Carriage return (ASCII 0D hex)
•
<LF>
Line feed (ASCII 0A hex)
When the targets are installed on a fixed platform and their co-ordinates are
entered in Northings and Eastings, AAA.AA and BBB.BB will also be in Northings
and Eastings and XXX.XXX will be true vessel heading.