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HMR3000 User's Guide
1.0 INTRODUCTION
The HMR3000 uses Honeywell magnetic sensors with proven MR technology and a two-axis tilt sensor to bring you the
heading information. This electronically gimbaled compass gives accurate heading even when the compass is tilted up to
45 degrees. This low power, small device is housed in a non-magnetic metallic enclosure that can be easily installed on
any platform.
The HMR3000 allows the user to configure compass output to include any combination of six NMEA standard messages
and to change measurement parameters for the magnetometer to suit the application. The sophisticated auto compass
calibration routines will correct for the hard-iron magnetic effects of the platform. The wide dynamic range of the
magnetometer (±1 G or 100 µT) allows the HMR3000 to be useful in applications with moderate local magnetic fields.
2.0 GETTING TO KNOW THE HMR3000 PRODUCT
2.1 Identifying the HMR3000
The HMR3000 Compass module comes in three different options:
(1) Bare circuit board with RS-232 or RS-485 electrical interface
(2) Housed Compass Module with RS-232 or RS-485 electrical interface
(3) Demonstration Kit (Housing and RS-232 only)
The electrical interface of the compass module is clearly marked on the circuit board in option (1) and on the product label
in option (2). Option (3) only comes with RS-232 electrical interface.
2.2 Setting Up the HMR3000
Interface and power cables—Interface and power supply should be included in the Demonstration Kit (see Electrical
Connections in Section 2.4).
For other HMR3000 product options, a cable having a standard 9-pin D shell female connector should be wired according
to the pin-out defined below. Power should only be connected to either pin 9 or pin 8. It is sufficient to connect the pins
listed in Table 1 for most applications. However, pins 1, 4, 6 and 7 serve specific purposes in the operation of HMR3000
and should be kept open (high logic state) in normal operation (see Table 2 for complete pin out description). See Figures
below for suggested cabling diagram for connection between HMR3000 and serial port of a personal computer.
Name
TxD / A
RxD / B
GND
6-15V
5V
Caution: Do NOT exceed +5.5V at regulated power input (pin 8). Higher voltages will damage components.
4
In/Out
Pin
Description
RS-232 transmit out / RS-485 transmit-receive
Out
2
signal
RS-232 receive in / RS-485 transmit-receive
In
3
return
In
5
Power and signal common
In
9
Unregulated power input
In
8
Regulated power input
Pin Assignment for Typical Operation of HMR3000
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