Garmin GPSMAP 17 Specifiche tecniche - Pagina 20

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4.2

Transmitted NMEA 0183 Sentences

The subsequent paragraphs define the sentences that can be transmitted on COM 1 by the GPS sensor.

4.2.1

Sentence Transmission Rate

Sentences are transmitted with respect to the user selected baud rate.

The GPS sensor will transmit each sentence (except where noted in particular transmitted sentence

descriptions) at a periodic rate based on the user selected baud rate and user selected output sentences. The

GPS sensor will transmit the selected sentences contiguously. The length of the transmission can be

determined by the following equation and Tables 2 and 3:

length of transmission

Sentence

GPRMC

GPGGA

GPGSA

GPGSV

PGRME

GPGLL

GPVTG

PGRMV

PGRMF

PGRMB

PGRMM

PGRMT

* Except GPS 16A

Table 2: NMEA 0183 Output Sentence Order and Size

Table 3: Characters per Second for Available Baud Rates

** GPS 16A Only

The maximum number of fields allowed in a single sentence is 82 characters including delimiters. Values

in the table include the sentence start delimiter character "$" and the termination delimiter <CR><LF>. The

factory set defaults will result in a once-per-second transmission at 4800 baud, which is the NMEA 0183

specification transmission rate.

4.2.1.1 GPS 16LVS, 16HVS, and GPS 17HVS (not 17N)

Regardless of the selected baud rate, the information transmitted by the GPS sensor is referenced to the

one-pulse-per-second output pulse immediately preceding the GPRMC sentence, or whichever sentence is

output first in the burst (see Table 2 above).

4.2.1.2 GPS 16A

Sentences are transmitted at a fixed 200-millisecond interval.

190-00228-20

total characters to be transmitted

---------------------------------------------

characters transmitted per second

Output by Default?

Once per minute

Baud

Characters per Second

300

600

1200

120

2400

240

4800

480

9600

960

19200

1920

38400 **

3840

GPS 16/17 Technical Specifications

Page 16

Maximum Characters

Rev. C