Honeywell hmr3000 TruePoint User Manual page 13

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HMR3500 User's Guide
declination and issue a DWMM message reporting the computed declination. The declination value is saved to the
compass' non-volatile memory and is used by the compass as the current declination value when computing azimuth.
The current magnetic declination is displayed in the Initialization dialog box (see Figure 7). To perform the calculation,
issue a WMM message. Because the calculations are extensive, the compass performs them in background mode, but
the calculated declination will be posted, and reported in a DWMM message, about one-half second later.
Name:
WMM/DWMM
ID:
0x55
Request Data: 15 bytes:
Data
Type
Day
uchar
Month
uchar
Year
uchar
Lat
float
Lon
float
Alt
float
The Day, Month, Year and Lat, Lon, Alt fields contain the date and position information needed by the World Magnetic
Model algorithm.
Reply Data: 23 bytes:
Data
Type
Status
uchar
Magnetic
Kang
declination
Source
char[20]
Version
Version Name: VRSN/DVRSN
ID:
0xC3
Request Data: None
Reply Data:
12 bytes:
Data
Type
Major
Int
Minor
Int
Options
uint
Serial Number
ulong
www.honeywell.com
Byte Offset
Description
0
Day of month [1..31]
1
Month of year [1.12]
2
Year – 2000
3-6
Latitude (degrees)
7-10
Longitude (degrees)
11-14
Altitude (meters)
Byte Offset
Description
0
0 = calculation inhibited
1 = calculation completed and posted
2 = calculation in process
3 = awaiting date and/or location
4 = flash write failure
1-2
Current variation (declination).
3-22
Name of USGS file from which model was derived (null
terminated)
Byte Offset
Description
0-1
Major firmware version number
2-3
Minor firmware version number
4-5
Firmware builds options as individual bit flags. Contact Honeywell for
details.
6-9
This unit's serial number.
13

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