Appendix A - Nmea 2000 Interfacing - Maretron WSO200 User Manual

Appendix A – NMEA 2000
WSO200 NMEA 2000
PGN 130306 – Wind Data
The WSO200 uses this PGN to provide a regular transmission of apparent wind speed
and direction data. The factory default for periodic transmission rate is ten times per
second. The transmission of this PGN can be disabled (see PGN 126208 – NMEA Request
Group Function – Transmission Periodic Rate).
Field 1: SID – The sequence identifier field is used to tie related PGNs together. For example,
the WSO200 will transmit identical SIDs for 130306 (Wind Data) and 130311
(Environmental Parameters) to indicate that the readings are linked together (i.e., the
data from each PGN was taken at the same time although they are reported at slightly
different times).
2: Wind Speed – This field is used to indicate the wind speed in units of 10mm/second.
3: Wind Direction – This field is used to indicate the wind direction in units of 0.0001
radians/second.
4: Wind Reference – This field is set to a value of 0x02 to indicate that the wind reading
is an apparent wind speed and direction.
5: Reserved (21 bits) – This field is reserved by NMEA; therefore, this field always
contains a value of 0x1FFFFF (the WSO200 sets all reserved bits to a logic 1)
PGN 130311 – Environmental Parameters
The WSO200 uses this PGN to provide a regular transmission of outside temperature, relative
humidity, and atmospheric pressure. The factory default for periodic transmission rate is twice
per second. The transmission of this PGN can be disabled (see PGN 126208 – NMEA Request
Group Function – Transmission Periodic Rate).
Field 1: SID – The sequence identifier field is used to tie related PGNs together. For example,
the WSO200 will transmit identical SIDs for 130306 (Wind Data) and 130311
(Environmental Parameters) to indicate that the readings are linked together (i.e., the
data from each PGN was taken at the same time although they are reported at slightly
different times).
2: Temperature Instance – The WSO200 sets this field to a value of 0x01 to indicate that
the temperature reading is a reading of outside temperature.
3: Humidity Instance – The WSO200 sets this field to a value of 0x01 to indicate that the
relative humidity reading is a reading of outside humidity.
4: Temperature – This field is used to indicate the outside air temperature in units of
0.01°K.
5: Humidity – This field is used to indicate the relative humidity in units of 0.004%.
6: Atmospheric Pressure – This field is used to indicate the barometric pressure in units
of 100 Pa.
PGN 130312 – Temperature
The WSO200 uses this PGN to provide a regular transmission of outside temperature. The
factory default for periodic transmission rate is disabled. The transmission of this PGN can be
enabled (see PGN 126208 – NMEA Request Group Function – Transmission Periodic Rate).
Revision 1.0
®
Periodic Data Transmitted PGNs
Appendix A – NMEA 2000
®
Interfacing
®
Interfacing Page A1