HMR3400 Datasheet, PDF (8/9 Pages) Honeywell Accelerometers – Digital Compass Solution

HMR3400
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.
Magnetic Filter
#MFL
The MFL command sets and reads the Magnetic Filter setting. When the Split Filter bit is cleared, this parameter
value will default to the value of SFL, the system filter. When the Split Filter bit is set, MFL parameter setting will
control the Magnetic Filter value. The parameter input is saved in the EEPROM immediately. Requires power
cycling or a Reset command (*R) to become effective. Values between 0 and 255 are valid, with a factory default
of 3. A good reason to increase the magnetic filter value would be the presence of AC magnetic fields from
nearby conductors or motors.
Eg: #SFL=0<cr><lf> Sets the magnetic filter value of zero (no filtering).
Configuration
#CON?
This command queries for the configuration status of the compass module. The output of the configuration value
is in decimal representation (in ASCII format) of the two byte configuration status. The 16-bit binary pattern is
defined below.
bit 15
N/A
bit 14
N/A
bit 13
N/A
bit 12
N/A
bit 11
N/A
bit 10
bit 9
SplitFilter Alarm
bit 8
Warn
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
N/A
N/A
1
N/A
H Out
N/A
Mag Out N/A
Parameter
Name
Mag Out
H Out
Warn
Alarm
SplitFilter
Bit Value
Reported
1
1
1
1
1
Effect
Magnetic Sensor Output Sentence selected (X, Y, Z)
Heading Output Sentence selected (H, P, R)
Device temperature has fallen below -10 C during this session of
operation. Rezero pitch and roll to clear after low temp.
Device temperature has fallen below -20 C during this session of
operation. Rezero pitch and roll to clear after low temp.
Independent Filter values for Magnetic and Tilt are used
Eg: #CON? Returns a response of #D=2088<cr><lf> meaning same filters used for magnetic and tilt data (bit 10
clear) and the compass module is sending heading data (bit 3 set).
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