900240 Rev. B
3/01
page 4
Note:
A non-zero HPR message rate should be chosen for View \ Interface to be active. The compass rose showing
Heading ant Tilt information will require a fast processor (Pentium) to respond fast enough with the compass output.
Slower computers will result in large time lags between the compass output and the display. All selected NMEA
messages will be updated in the
Display \ Monitor NMEA Sentences
The HMR3000 output can be changed to include all or any of the six NMEA sentences each with its own rate.
User can capture the output messages to a file using the Capture Mode by selecting the message to be captured.
[
Diagnostics \ Options
menu]. User can also change the measurement parameters of the HMR3000 through PC Demo
Interface software.
2.8
Configuring the HMR3000
Following is a list of basic parameters that would be accessed routinely and at installation. Advanced parameters that
control the operation of the magnetometer, heading output, and warning levels are described in the
Configuration
Parameters section
2.9
Using PC Demo Interface
Activate the Tune Parameters button to configure.
Function
Parameter /Description
Located under
Range
Declination
Declination
Angle between magnetic north and
geographic north. Add declination to
magnetic heading to obtain True heading
General page
±
0-180 deg
±
0- 3200 mils
Output
Messages and
Rate
HDG, HDT, XDR, HPR, RCD, CCD
NMEA sentence outputs
Rates in sentences per minute
Serial Output page
None or All
0-1200 /min
Data Filter
TC1
Time constant for IIR filter
0-255
1=72 ms
Heading Output
L and S
Smoothing factors for non linear filter
0<S<1
L= integer >1
L=0 disable
L<256
Deviation
Deviation
The angle between compass forward direction
and that of the platform.
Add deviation to get platform heading
General page
±
0-180 deg
±
0- 3200 mils
Table 2. Parameters attached routinely or at installation
2.10
Communication—RS485 Option
Operation and configuration of a HMR3000 with RS485 interface is directed through direct command input from the host
computer/microprocessor. No graphical interface is supplied with this product option.
See Configuration Parameters section
for details
and Figure 2 for computer connections.
RS-232 to RS-485
B & B Electronics
#485TBLED
RS -485
Gnd
+12 VDC
RS -485
(B)
2
(A)
3
Gnd
5
Pwr
9
DB9 socket
connector
+12VDC
VAC
2 RD
3 TD
7 GD
TD
RD
GD
RS-232
SD Con trol
Echo Off
Shield
TD(A)
TD(B)
RD(A)
RD(B)
GND
+12V
1
2
3
4
5
6
7
