Raymarine NMEA Multiplexer Especificações descarregar pdf (Página 23)

back to the second GPS. When Check GPS status is enabled, the multiplexer checks the Status

field of GPS sentences. When the Status field indicates ‘Invalid data’, the multiplexer will block

these sentences, allowing the priority system to time out and pass sentences from the second GPS.

Sentences of which the Status flag is checked are APB, GGA, GLL, RMA, RMB, RMC, VTG and XTE.

Time Out

This setting allows you to set the time it takes before sentences from a lower priority input are

passed.

Channels

This option inserts channel number information in the NMEA stream that is sent to the host

interface(s).

When NMEA is selected, each received NMEA sentence is preceded by a $PSMDCN sentence to

indicate on which NMEA input the following sentence was received. The following example shows

that the IIGGA sentence was received on input 1, the GPGGA sentence on input 2, the IIGLL

sentence on input 1 and the HEHDT sentence on input 3.

When TAG Blk is selected, the multiplexer adds an NMEA 0183 V4.0 TAG block to each sentence

that is sent to the host interface(s). This TAG block contains a source identification parameter

indicating on which input that sentence was received. The following example shows the same data

as above, but with TAG blocks added.

Channel numbers allow distinguishing between similar data from different instruments, like two

depth sounders on the same boat.

See the Technical Reference section for a description of the TAG block.

SeaTalk on In 4

To receive SeaTalk

data from Raymarine

instruments and convert it into NMEA sentences, this

option must be enabled. SeaTalk is a proprietary protocol developed by Raymarine and it is used

for data exchange between Raymarine navigation instruments like the ST40, ST50 and ST60

series. To be able to use these instruments with commonly available navigation programs or to

feed their data into non-Raymarine instruments, the SeaTalk data needs to be translated into

NMEA sentences. See the Technical Reference section for an overview of translated SeaTalk data.

Selecting this option will automatically set In4 and Out1 to 4800 Baud and disable the speed

setting.

SeaTalk Priority

This sets the priority of the SeaTalk data. It can be either Highest (SeaTalk - In1 - In2 - In3) or

Lowest (In1 - In2 - In3 - SeaTalk).

NMEA Conversions.

The NMEA Conversions allow you to convert specific NMEA sentences into new NMEA sentences.

The originating sentence used for a conversion is forwarded as usual but if desired, it can be

blocked using the sentence filter. The conversion results can be routed anywhere using the default

route and Sentence Filter and are available on the virtual input NMEA Conversions and input ‘C’

in the sentence filter.

Magnetic to True Heading (HDG, HDM -> HDT)

If this option is enabled, the multiplexer will generate an HDT sentence (true heading) when an

HDG or HDM sentence (magnetic heading) is received. If the HDG sentence contains a magnetic

variation, it is used to calculate the true heading from the magnetic heading. Otherwise the

magnetic heading value is just copied.

This option can be useful when a device needs a true heading while only a fluxgate compass is

available on board. Many satellite telephones for instance need a true heading to be able to direct

their antenna to the right communications satellite.

$PSMDCN,1*1A

$IIGGA,143357.999,5301.0061,N,00635.5479,E,1,06,1.9,90.0,M,,,,0000*2E

$PSMDCN,2*19

$GPGGA,143357.999,5301.0061,N,00635.5479,E,1,06,1.9,90.0,M,,,,0000*39

$PSMDCN,1*1A

$IIGLL,5301.0061,N,00635.5479,E,143357.999,A*22

$PSMDCN,3*18

$HEHDT,67.0,T*1E

\s:mch1*1E\$IIGGA,143357.999,5301.0061,N,00635.5479,E,1,06,1.9,90.0,M,,,,0000*2E

\s:mch2*1D\$GPGGA,143357.999,5301.0061,N,00635.5479,E,1,06,1.9,90.0,M,,,,0000*39

\s:mch1*1E\$IIGLL,5301.0061,N,00635.5479,E,143357.999,A*22

\s:mch3*1B\$HEHDT,67.0,T*1E

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 43 44

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