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Honeywell Magnetic Sensor Products
HMR3500 TruePoint Digital
Compass User's Guide
The enclosed technical data is export classified as 7A994. Diversion contrary to U.S. export laws and regulations is prohibited.


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  • Page 1 Honeywell Magnetic Sensor Products HMR3500 TruePoint Digital Compass User’s Guide The enclosed technical data is export classified as 7A994. Diversion contrary to U.S. export laws and regulations is prohibited.
  • Page 2 3 sweeps, 0º to 360º, level deg rms Pitch and Roll Roll Range Default orientation, rotation about X-axis ±180° Pitch Range Default orientation, rotation about Y-axis ±80° Accuracy Roll ±30º, Pitch ±30º deg rms Null Accuracy Level ±0.5 Resolution Level, 1-sigma, 100 readings 0.04
  • Page 3 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.
  • Page 4 UNC 4-40 fastening hardware is recommended for mounting the printed circuit board with at least 0.125 inch nylon spacers to stand off the board from the mounting surface. Fastener hardware must be non-ferrous for full compass performance with brass or nylon screws the usual materials of choice.
  • Page 5 From the basic magnetic heading, a declination value may be added Power Power to arrive at a geographic north Supply Supply referenced heading. index offset value may also be added to Figure 3 correct for mechanical installation HMR3500 Block Diagram misalignment target platform.
  • Page 6 256. 3.2 NUMERIC DATA FORMAT Each packet type description below includes a detailed description of the function and the data passed in the message. Numeric data can be represented using specific data types described in Table 1 below.
  • Page 7 Since the compass is closely related to Honeywell’s DRM products, many messages are common to both the compass and Dead Reckoning Modules. A major exception is the ID codes for the VRSN/DVRSN messages which have been changed for the compass to prevent confusion among support programs.
  • Page 8 DPOWER message, which is sent as a normal part of the power-up sequence, as an indication that the compass has reset. Because of the full reset, all power-up defaults will be restored.
  • Page 9 The message ends with the firmware version, both major and minor, and suffixes which indicate build options which were in effect, information which could be helpful to Honeywell for diagnosing problems. However, do not try to process this string with software. All information in it, and then some, is also available in the DVRSN message described on page 13.
  • Page 10 Uchar Bit flags; 1 = load corresponding value: 0 (0x01) = Azimuth offset. 1 (0x02) = Roll offset. 2 (0x04) = Pitch offset. Azimuth offset Kang Azimuth (mounting) offset. Roll offset Kang Roll offset. Pitch offset Kang Pitch offset.
  • Page 11 Do not confuse the quantities in these messages with the corresponding working variables. What are affected here are start-up defaults, and these may be, and probably are, different from the actual current values in effect.
  • Page 12 ±½°. The local WMM magnetic declination is a function of latitude, longitude, altitude, and date. These input values are specified in the WMM message. When the compass receives a WMM message, it will compute the local WMM magnetic
  • Page 13 Reply Data: 12 bytes: Data Type Byte Offset Description Major Major firmware version number Minor Minor firmware version number Options uint Firmware builds options as individual bit flags. Contact Honeywell for details. Serial Number ulong This unit’s serial number.
  • Page 14 Direction taken as forward. Same codes as used for up orientation. Orientation Note: For the most part, message type codes for the compass coincide with those for Honeywell’s Dead Reckoning ® Module (DRM ), but that for VRSN/DVRSN is specifically different to prevent support software from confusing the two products.
  • Page 15 Milliseconds between DORIENT messages. If necessary, the module will round this to the nearest multiple of five. A value of zero disables DORIENT messages; a value of –1 causes the DORRATE message to return the current value without changing it.
  • Page 16 To the right of that is the module’s firmware version and other information returned in the DVRSN message. (See message details for Version, page 13.) Finally, the serial COM port currently active is shown at the lower right corner. Both the toolbar and the status bar can be hidden if desired.
  • Page 17 4.5 REQUESTS AND COMMANDS This section describes the actions available from the menu bar. In some cases, they are also available through a button on the toolbar, and that button is shown with the description. Figure 4: CompassHost Main Window Display
  • Page 18 Toggles the visibility of the status bar. Status View Toggles a special child window on top of the main display. This view maintains a summary of current information taken from DORIENT and DRMC messages as illustrated in Figure 5.
  • Page 19 Figure 7. The quantities are controlled by three messages, and this command solicits current values from the module for all of them before the dialog is displayed. Initializations will be overwritten by the startup defaults for these parameters that are stored in non- volatile memory.
  • Page 20 The RSET command sent to the module is described on page 8). Also, serial number and version information stored in the CompassHost program will be reset. The module should respond with a DPOWER, which will cause CompassHost to solicit version information again.
  • Page 21 CompassHost checked. Any of the speeds may be selected. If, for any reason, you have a module operating at a different baud rate, this menu item can be used to set
  • Page 22 The computation may take a few minutes, during which the computation progress bar shows its status. When finished, the compass module returns a figure of merit indication which is shown below the computation progress bar in the box labeled
  • Page 23 Pitch attitude in degrees as determined by the compass. Roll Roll attitude in degrees as determined by the compass.. MOfst Mounting offset in degrees. Although the compass treats this correction as a constant, it may be changed by command while the module is operating.
  • Page 24 Honeywell reserves the right to make changes to improve reliability, function or design. Honeywell does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.

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