Hmr3000 Measurement Parameters - Honeywell HMR3000 User Manual

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HMR3000 User's Guide
Response
Variation angle
Query
Response

4.3 HMR3000 Measurement Parameters

Parameters in this section affect the measurement functions of the HMR3000 digital compass. "Mag sample rate" is a key
setting that affects both continuous and strobe mode measurements. In continuous mode, either 1, 2, 4, or 8
magnetometer measurements are averaged per tilt measurement depending on the "Mag sample rate" setting.
In strobe mode, measurements are suspended until an NMEA query command is received. When this occurs, "Mag
sample rate" determines how many magnetometer readings are collected per tilt measurement as above, and "Strobe
mode count" determines the number of readings to be averaged before returning the resulting requested sentence. A
"Strobe mode count" of zero will result in 256 samples being averaged, which will require 18.6 seconds between the end
of the query request and the start of the output sentence.
The "Mag units factor" setting is used to convert normalized magnetometer readings to milliGauss for output in XDR and
CCD messages. The intent is to provide outputs with approximate field strength units so that the magnitude of the
numbers make sense.
Parameter Name
Mag sample rate
Query
Response
Strobe Mode Count
Query
Response
18
value
Deviation angle
Sets the Variation angle to value nnn.n
(in
degree mode) 'hh' is the checksum
value
Variation angle
Description
Magnetometer sampling rate
13.75 , 27.5, 55, 110 Hz
This parameter will determine the number of
magnetometer readings averaged per heading
output. Set to 13.75 Hz for low power
consumption
m=1 for 13.75, m=2 for 27.5, m=4 for 55,
m=8 for 110 Hz
Number of heading measurements to be
average before issuing an output in Strobe
Mode operation (0 to 255)
N= Number of reading to average (0 to 255)
#nnn.n*hh<CR><lf>
#IE4=nnn.n*hh<CR><lf>
#IE4?*07<CR><lf>
#nnn.n*hh<CR><lf>
Command Syntax
#BA6=1*39<CR><lf> for 13.75 Hz
#BA6=2*3A<CR><lf> for 27.5 Hz
#BA6=4*3C<CR><lf> for 55 Hz
#BA6=8*30<CR><lf> for 110 Hz
#BA6?*0A<CR><lf>
#m*hh<CR><lf>
#BA7=nn*hh<CR><lf>
#BA7?*0B<CR><lf>
#N*hh<CR><lf>
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