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LA000504D © 2006 Navman New Zealand. All rights reserved. Proprietary information and specifications subject to change without notice.
6.2.2 Low power acquisition configuration
The following message sets the acquisition parameters of the low power mode:
$PSRF167,aaaa,bbbb,cccc,d[*CS]
where:
Field
Description
a
maximum off time (milliseconds)
b
maximum search time (milliseconds)
c
Push-To-Fix period (seconds)
d
adaptive TricklePower (1=on, 0=off)
Table 6-3: Low power acquisition input values
This message is the NMEA equivalent of the SiRF Binary input message ID 167.
System response:
$PTTK,LPACQ,aaaa,bbbb,cccc,d*CS
The updated values returned by the system are as described in Table 6-3.
6.3 Navman NMEA active antenna status message
The Jupiter 110 software includes an antenna monitor message driven by the state of the
antenna monitor inputs. The pins GPIO6 (overcurrent detect) and GPIO5 (internal antenna
detect) are configured as inputs (both active high). Note that these pins are not connected to the
input/output connector.
The antenna status output message is an NMEA message in the form:
$PTTK,ANT,d*CS
Where
d
represents any of the following numbers:
d
Description
0
using external antenna
1
using internal (patch) antenna
2
external antenna short circuit
Table 6-4: Antenna status output message values
The antenna status message is output automatically in the event of an external antenna being
connected or disconnected, or of a short circuit on the external antenna.
In addition, this message is output on the receipt of the NMEA input message:
$PSRF199[*CS]
The antenna status is also output as the SiRF binary message with message ID 99. It contains
one byte of data, being the appropriate value from Table 6-4. This gives a payload length of 2
bytes, since the message ID is considered part of the payload.
The antenna status message is output automatically in the event of an external antenna being
connected or disconnected, or of a short circuit on the external antenna.
In addition, this message is output on the receipt of the SiRF binary message with message ID
199. The output rate of this message is also under the normal control of the SiRF Binary Query/
Rate Control input message, however this message is not output at a regular rate by default.
6.4 SiRF binary output
The NMEA command format to change the data protocol to SiRF binary can be found in the
Navman NMEA reference manual. For a full list of the SiRF binary commands, refer to the SiRF
Binary Protocol reference manual.
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