Garmin GPS 17N 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
30
600
60
1200
120
2400
240
4800
480
9600
960
19200
1920
38400 **
3840
GPS 16/17 Technical Specifications
Page 16
Maximum Characters
74
82
66
70
35
44
42
32
82
40
32
50
Rev. C