Garmin GPS 17 Series Specifiche tecniche - Pagina 19
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4.1.6
Tune DGPS Beacon Receiver (PSLIB)
The $PSLIB sentence provides the ability to tune a Garmin GBR 21, GBR 23 or equivalent beacon receiver.
$PSLIB,<1>,<2>*hh<CR><LF>
<1>
Beacon tune frequency, 0.0, 283.5–325.0 kHz in 0.5 kHz steps
<2>
Beacon bit rate, 0, 25, 50, 100, or 200 bps
If valid data is received, the GPS sensor will store it in the EEPROM and echo the PSLIB command to the beacon
receiver. If the GPS sensor is using any stored beacon frequency other than 0.0, it will tune the beacon receiver once
immediately after power up or external reset.
4.2
Transmitted NMEA 0183 Sentences
The subsequent paragraphs define the sentences that can be transmitted on COM 1 by the GPS sensor.
4.2.1
Sentence Transmission Rate
Sentences are transmitted with respect to the user selected baud rate.
The GPS sensor will transmit each sentence (except where noted in particular transmitted sentence descriptions) at a
periodic rate based on the user selected baud rate and user selected output sentences. The GPS sensor will transmit
the selected sentences contiguously. The length of the transmission can be determined by the following equation and
Tables 2 and 3:
length of transmission
Sentence
GPRMC
GPGGA
GPGSA
GPGSV
PGRME
GPGLL
GPVTG
PGRMV
PGRMF
PGRMB
PGRMM
PGRMT
The maximum number of fields allowed in a single sentence is 82 characters including delimiters. Values in the
table include the sentence start delimiter character "$" and the termination delimiter <CR><LF>. The factory set
defaults will result in a once-per-second transmission at 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).
190-00228-21
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
300
600
1200
2400
4800
9600
19200
38400
Table 3: Characters per Second for Available Baud Rates
GPS 16/17 Technical Specifications
Page 15
Maximum Characters
74
82
66
70
35
44
42
32
82
40
32
50
30
60
120
240
480
960
1920
3840
Rev. A