Garmin GPS 17x Technical Specifications - Page 16

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Garmin GPS 17x Technical Specifications

4.2 TRANSMITTED NMEA 0183 SENTENCES

The subsequent paragraphs define the sentences that can be transmitted by the GPS 17x HVS.
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
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>. For the GPS 17x
HVS, the factory set defaults result in a once per second transmission at the NMEA 0183 specification transmission
rate of 4800 baud.
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).
190-00885-07
total characters to be transmitted
=
---------------------------------------------
characters transmitted per second
Output by Default?
Once per minute

Table 2: NMEA 0183 Output Sentence Order and Size

Baud
Characters per Second
4800
9600
19200
38400

Table 3: Characters per Second for Available Baud Rates

GPS 17x HVS Technical Specifications
Page 12
Maximum Characters
74
82
66
70
35
44
42
32
82
40
50
480
960
1920
3840
Rev. A