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HMR4007
SENSOR PRODUCTS
HMR4007
Linear Position Sensor
User’s Guide
Solid State Electronics Center • www.magneticsensors.com • (800) 323-8295 • Page 1
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HMR4007 SENSOR PRODUCTS INTRODUCTION The Honeywell HMR4007 is an electronic linear position sensing solution for use in commercial and industrial application environments. A stationary array of Honeywell’s magnetoresistive (MR) sensors is utilized to quickly and accurately monitor the position of a small magnet attached to a moving object such as a valve stem or hydraulic cylinder. The use of a sensor array makes the solution highly insensitive to many environmental influences such as magnet
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HMR4007 SENSOR PRODUCTS SPECIFICATIONS Characteristics Conditions Min Typ Max Units General Accuracy 0.2 0.1 mm Resolution 0.1 mm Hysteresis 0.01 mm Repeatability 0.01 0.1 mm Update Rate 10 30 Hz (note 1) Standoff Distance (gap) between the target 0.1 5 mm magnet and the sensor board Magnetic Field Range magnetic field at the sensor array 80(note 1) gauss (note 3) length apparent magnet length at sensor array 23 mm Orientation Axial (note 2) Electrical Input Voltage Unregu
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HMR4007 SENSOR PRODUCTS PIN CONFIGURATION Pin Number Pin Name Description Digital Interface 1 RTS Serial Clock Output 2 Data_Out Serial Data Output 3 Data_In Serial Data Input 4 CTS Serial Clock Input 5 Power Unregulated Power Input (+6 to +28 VDC) (see note 1) 6 GND Power and Signal Ground Analog Interface 1 Power Unregulated Power Input (+6 to +28 VDC) (see note 2) 2 Analog Out 0 - 2.5 VDC analog output 3 Position Valid TTL level (0 = position invalid, 1 = position valid) 4 GND Power and
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HMR4007 SENSOR PRODUCTS PHYSICAL CHARACTERISTICS The circuit board for the HMR4007 Linear Position Sensor is approximately 340mm by 80mm. A 6-pin right angle connector (J1) and two 4-pin connectors (J2, J3) protrude from the back of the board for user connections. Components on the top-side have a maximum height of 12mm. Figure 1 shows a typical circuit board with dimensions. PARTS PLACEMENT Not used 1 2 3 leave all OPEN JP1 Where 1= J3 (USB) 2= J2 (Analog output) 3 =J1(digital communicat
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HMR4007 SENSOR PRODUCTS APPLICATION NOTES USING THE HMR4007 AS A STAND ALONE SENSOR Introduction The HMR4007 can be used as a stand-alone sensor without the need for any digital communications. The board is configured at the factory to provide a 0-2.5 VDC analog output (axial magnet) and status signal that represents the position of the magnet along the long axis of the device. All power and signals are available on connector J2. Connector J2 General Description When used in a stand-along mod
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HMR4007 SENSOR PRODUCTS USING THE HMR4007 IN DIGITAL COMMUNICATIONS MODE Introduction The HMR4007 is capable of communicating with a higher-level system through a proprietary communications port (J1). This port uses a bit-clocked serial protocol for higher speed and higher data integrity than standard serial protocols. Signal levels are standard TTL compatible. For convenience, a windows-based DLL (dynamic link library) and sample Visual Basic demonstration program are available from Honeyw
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HMR4007 SENSOR PRODUCTS The second function, "CurrentPosition", is used to query the current position of the magnet. The following 16-bit integer values are returned: 0-1024 normal position response where 1024 represents full scale response. -1, -2 communications failure. The sensor failed to respond to the PC quickly enough. This is usually caused by improper wiring, improper power settings, a timeout value too small for the PC speed, or the DLL not being initialized before attempting to get
