Message 1214 (Dgps Control); Message 1216 (Cold Start Control) - Navman 12 Designer's Manual

3.5.2.6 Message 1214 (DGPS control)

This message allows the user to control the
behavior of the receiver's differential capability.
Storage of this message's parameters requires
EEPROM. The contents of the 'DGPS control'
message are described in Table 3-28.

3.5.2.7 Message 1216 (cold start control)

This message allows the user to disable the cold
start acquisition mode of the receiver. When cold
start is enabled at power-on, the cold start timer
is set to 0. If a satellite is not acquired before the
cold start time-out is exceeded, the cold start
acquisition mode starts. If a satellite is acquired,
the cold start timer is reset to 0, the receiver is
re-positioned under the satellite, and the search
Message ID: 1214
Rate: as required (maximum rate 1 Hz)
Message length: 9 words
Word No.
1-4
5
6 Sequence number (Note 1)
7.0
7.1 Correction data base reset
7.2-7.15
8
9
Note 1: The sequence number is a count that indicates whether the data in a particular binary message has been updated or
changed since the last message input.
Message ID: 1216
Rate: as required (maximum rate 1 Hz)
Message length: 9 words
Word No.
1-4
5
6 Reserved (sequence number)
7.0
7.1-7.15
8
9
Note 1: The sequence number is a count that indicates whether the data in a particular binary message has been updated or
changed since the last message input.
MN002000A © 2004 Navman NZ Ltd. All rights reserved. Proprietary information and specifications subject to change without notice.
Name
Message header
Header checksum
DGPS disable
Reserved
Correction timeout
Data checksum
Table 3-28 Message 1214 (differential GPS control)
Name
Message header
Header checksum
Cold start disable
Reserved
Cold start timeout
Data checksum
Table 3-29 Message 1216 (cold start control)
continues until either the receiver navigates or the
timer is exceeded.
Cold start acquisition mode does not use the initial
conditions of position, time, and almanac. This
causes the receiver to look at a wider range of
frequencies and satellites. The default cold start
timer is 5 minutes. Normal operation is to leave
cold start enabled. However, in certain enclosed
situations (e.g. garages, houses, office buildings,
etc.), faster acquisitions may be achieved with
cold start disabled storage of the cold start disable
parameter requires EEPROM. The contents of
the 'cold start control' message are described in
Table 3-29.
Type Units
I
bit
bit
UI
Type Units
I
Bit
UI s
Range
0 to 32 767
1 = disable
1 = reset
0 to 32 767
Range Resolution
0 to 32 767
1 = disable
0 to 32 767
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