HMR3300 Datasheet, PDF (8/11 Pages) Honeywell Solid State Electronics Center – Digital Compass Solutions

HMR3200/3300
Configuration Commands
Syntax: #Dev=±xxxx<cr><lf> Sets parameter value
#Dev?<cr><lf>
Queries for the parameter value
Variation Input (Declination Angle Correction)
#Var=±nnnn<cr><lf> where the variation is ± nnn.n degrees
Sets the declination angle between magnetic north and geographic north. The declination angle is subtracted
from the magnetic north heading computed to create a geographic north heading. Values typically range in the
±25 degree area. For example New York has a -14 degree declination angle, and Los Angles has a +14 degree
declination angle.
Eg: #Var=-203<cr><lf> sets the declination angle to –20.3 degrees.
Eg: #Var=?<cr><lf>returns the declination angle; –20.3
Deviation Input (Platform Angle Correction)
#Dev=±nnnn<cr><lf> where the angle is ± nnn.n degrees
Sets or returns the angle between compass forward direction and that of the mounting platform. The Deviation
angle is subtracted from the predicted heading to compensate for mechanical misalignment.
Eg: #Dev=23<cr><lf> sets the deviation angle to +2.3 degrees.
Eg: #Dev=?<cr><lf>returns the deviation angle; +2.3
User Magnetic Offset Values (X, Y and Z)
#Xof, #Yof, #Zof
Sets or returns the user offset values for each magnetic axis. These values are recomputed after a calibration
routine. Also fixed offsets can be inserted to correct for known magnetic shifts. Values are in ADC counts.
Eg: #Xof=+47<cr><lf> sets the x offset value to +47.
Eg: #Xof=?<cr><lf> returns the x offset value; +47.
Baud Rate
#Bau
Sets the compass transmit and recieve baud rate. 19200, 9600, 4800 and 2400 are the only allowed values.
Baud rate can not be queried and is sent to the EEPROM to overwrite the present setting. Factory default is
19200.
Eg: #XBau=9600<cr><lf> sets the Baud Rate to 9600 after the next Reset command or power cycle.
System Filter
#SFL
Sets and reads the system IIR filter setting. When the Split Filter bit is cleared, this parameter value will become
the default value for both Magnetic and Tilt Filters. When the Split Filter bit is set, SFL parameter setting will
control the Tilt filter value only. The parameter input is saved in the EEPROM immediately. Requires power
cycling or a Reset command (*R) to become effective. The setting of the Split Filter bit can be queried via the
#CON? command. Values between 0 and 255 are valid, with a factory default of 3. A good reason to increase the
filter value would be in the presence of high mechanical vibration environments.
Eg: #SFL=6<cr><lf> Sets the system filter value of 6.
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