Si-tex SP38, Инструкция по установке и эксплуатации, Страница: 173 / 193

Sitex SP38 Installation and Operation Appendices
Document PN 29010101 V1r0
- 173 -
• If only HDM is received, then the autopilot will use Magnetic Heading (indicated by an
‘M’), from that sentence.
Messages Transmitted
The SP38 outputs NMEA 0183 compliant data (at 4800 Baud, on the OUT A/B pins of the J9
– NAV I/O connector), which may be used by NMEA 0183 compliant LISTENERS, or may be
used to observe and/or record various SP38 parameters, for diagnostic purposes, while the
system is running.
The SP38 outputs 3 sentences:
*HDG Heading, Deviation and Variation
*HDT Heading, True
*PCMNS (Sitex Proprietary Sentence)
HDG and HDT are output at 9 times per second.
The TALKER Identifier is AP, in all cases. All messages have valid checksums.
The PCMS sentence is output, once per second, if the Vessel Type in the Dockside Setup
menu is set to Sail.
Example:
$PCMNS,PS,340.0,339.6,M,0.1,0.4,,,*2C
1) $
⇒
the symbol that starts all NMEA 0183 sentences
2) P
⇒
identifies a proprietary sentence
3) CMN
⇒
the identifier assigned to Sitex Marine Ltd. by NMEA
4) S
⇒
status type sentence
5) Mode: SB
⇒
STANDBY mode, PS
⇒
POWER STEER mode,
AP = AUTO mode, NA = NAV mode
6) Commanded Heading, degrees
7) Actual heading, degrees
8) Units of heading: M
⇒
Degrees Magnetic, T
⇒
Degrees True
9) Commanded Rudder Angle
10) Actual Rudder Angle
11) ALC corrected heading
12) W
⇒
mode active (field is blank if not)
13) L
⇒
ALC active
14) Checksum, as per NMEA 0183 standard