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HMR3500 User's Guide
Characteristics
Roll Repeatability
Pitch Repeatability
Magnetic Field
Range
Resolution
Dip Angle
Linearity
Electrical
Input Voltage
Power
Digital Interface
UART
Update Rate
Format
Bi-directional binary packet data protocol.
Physical
Dimensions
Weight
Connector
Environment
Temperature
1
Null zeroing prior to use of the HMR3500 and upon exposure to temperature excursions beyond the Operating
Temperature limits is required to achieve highest performance.
2.4 PIN CONFIGURATION
Pin Number
Pin Number
1
Ground
2
RXD
3
TXD
4
+Vin
5
Ground
2.5 BASIC DEVICE OPERATION
The HMR3500 TruePoint Compass Module includes 3-axis Anisotropic Magneto-Resistive (AMR) sensors, 3-axis MEMS
accelerometers, a temperature sensor, and 16-bit microprocessor with onboard Analog to Digital Converter (ADC). The
HMR3500 is available as a printed circuit board assembly, or assembled in a black aluminum case with cable assembly.
Additionally, the cable assembly can be ordered separately. A demonstration kit of the HMR3500 is available with the
case, cable assembly, a CD of the CompassHost windows utility software for the user's personal computer.
www.honeywell.com
Conditions
Roll ±70º
Pitch ±70º
Roll ±70º
Pitch ±70º
Maximum Magnetic Flux Density
1-sigma, 100 readings
Earth's Vertical Field Component
Standard Product
Input Voltage 2.5 to 5.2V
ASCII
Continuous Heading Updates
Circuit Board Assembly
HMR3500 PCB only
HMR3500 with case, no cable
5-pin, 2mm pin spacing
Operating
Storage (OEM only)
Power Supply Return and Ground Reference
RS-232 Receive Data
RS-232 Transmit Data
Positive Power Supply Voltage Input
Ground Reference (for twisted pair routing with +Vin)
Min
Typ
0.2
0.2
0.1
0.1
0.7
0.45
-70
0.2
2.5
5.0
300
4800
9600
0.05
10
RS-232
1.97 x 1.65
x 0.52
0.6
3.0
-40
-
-55
-
Description
Max
Units
deg rms
deg rms
gauss
milli-gauss
+70
deg
%FS
5.2
volts DC
mW
38,400
Baud
25
Hz
-
inches
ounce
ounces
-
+85
°C
+125
°C
3
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