Crossbow Technology CXM539 User manual

Crossbow Technology, Inc., 41 E. Daggett Dr., San Jose, CA 95134

Tel: 408-965-3300, Fax: 408-324-4840

email: [email protected], website: www.xbow.com

CXM539 User’s Manual

High Speed Digital 3-Axis Fluxgate

Magnetometer

Revision 1.2 October 2001

PN 6001-0014

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in this document is subject to change without notice.

Crossbow and SoftSensor are registered trademarks and DMU is a

trademark of Crossbow Technology, Inc. Other product and trade names

are trademarks or registered trademarks of their respective holders.

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Table of Contents

1Description of the System.....................................................1

2System Specifications ...........................................................2

3Electrical and Mechanical Interface.....................................3

4System Startup and Checkout..............................................5

4.1 Startup Using a Terminal Emulator Program.....................................5

4.2 System Checkout.....................................................................................6

5CXM539 Configuration Options and Data Output Formats 8

6Appendix A. CXM539 command spec................................11

6.1 Main Commands (available in all modes)........................................11

6.2 Calibration Commands (only available in config mode)...............12

6.3 EEROM Map.........................................................................................12

6.4 Software Data Correction Equations.................................................14

7Appendix B. Filter Values and Data Rates.........................15

8Appendix C. Warranty and Support Information..............16

8.1 Customer Service ..................................................................................16

8.2 Contact Directory..................................................................................16

8.3 Return Procedure...................................................................................16

8.4 Warranty.................................................................................................17

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About this Manual

The following annotations have been used to provide additional

information.

XNOTE

Note provides additional information about the topic.

þEXAMPLE

Examples are given throughout the manual to help the reader understand the

terminology.

PIMPORTANT

This symbol defines items that have significant meaning to the user

MWARNING

The user should payparticular attention to this symbol. It means there is a

chance that physical harm could happen to either the person or the

equipment.

The following paragraph heading formatting is used in this manual:

1 Heading 1

1.1 Heading 2

1.1.1 Heading 3

Normal

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CXM539 User’s Manual

Doc.# 6001-0014 Rev1.2Page 1

1Description of the System

The model CXM539 High Speed Digital 3 Axis Fluxgate Magnetometer is

the first high-speed digital output 3-axis fluxgate magnetometer to be

commercially available. The system can convert and transmit over its serial

port (at 38400 baud) all three axes outputs at a rate of 250 samples per

second. Slower data rates can also be selected; transmission rate and baud

rates are user programmable. The CXM539 uses 3 separate 16-bit sigma

delta analog to digital (A to D) converters to achieve the high throughput.

The scale factor is set so that a full scale input of 10-4T (1 G) represents

32768 counts on the system A to D converters. The least count represents

about 3 nT. Noise of the system is 1 -2 counts.

The CXM539 system is ideallysuited to situations where high speed

magnetic data must be acquired and analyzed. In the past, such systems

have normally used a combination of an analog output fluxgate and an A to

D board in a PC. The CXM539 simplifies and reduces the cost of the

magnetic data acquisition system by eliminating the cumbersome A to D

board.

The CXM539 can be used in either a command mode or autosend mode. In

the command mode, the CXM539 responds to commands to transmit data

issued by an external computer. In the autosend mode, the CXM539

commences sending data as soon as power is applied to the unit.

The CXM539 can be supplied with an optional connector box, which allows

easy powering and connection to an external computer.

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CXM539 User’s Manual

Doc.# 6001-0014 Rev1.2Page 2

2System Specifications

Accuracy ±0.1 µT (±1 mGauss)

Noise level ±0.003 µT (±0.03 mGauss)

Range ±100 µT (±1 Gauss)

Scale stability ±.05% FS/°C

Initial offset <±200 nT (±2 mG)

Offset vs. temp <5 nT/°C (<0.05 mG)

Orthogonality of axes better than ±0.5°

Alignment of axes with package better than ±0.5°

Linearity ±0.1% full scale

Maximum data transfer speed(38,400 baud) 250 -3 -axis samples/sec

Power 100 ma @ +6 to +15 VDC

A to D 3 -16 bit Sigma Delta

Baud rate (user selectable) 300, 1200, 2400, 4800, 9600,

19200, 38400, 72800

Temperature range -25 to 70°C

Size 1.60”W x 4.08”L x 1.13”H

4 cm x 10.4 cm x 2.9 cm

Connector 9 pin nonmagnetic “D”

(female)

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CXM539 User’s Manual

Doc.# 6001-0014 Rev1.2Page 3

3Electrical and Mechanical Interface

The CXM539 is powered from a single inputvoltage that can range

between +6 V and +15 V. Current consumption is 100 ma. Two serial

interfaces are present; one that uses RS-232 levels and one that uses TTL

levels. The baud rate is user programmable and can be set at the following

values: 300, 1200, 2400, 4800, 9600, 19200, 38400, and 72800. The data

words employ 8 bits with one stop bit and no parity.

A female 9 pin D connector is used to provide an electrical interface to the

CXM539 system. The Pin out of this connector is as follows:

Pin Function

1not used

2RS 232 out

3RS 232 in

4not used

5ground

6TTL serial out

7TTL serial in

8configure

9+ V in (+7.5 V to +15 V)

A drawing showing the dimensions and mounting hole design of the

CXM539 is shown belowin Fig. 1.

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CXM539 User’s Manual

Doc.# 6001-0014 Rev1.2Page 4

4X 16

4.08”

(10.4 cm)

1.60”

(4 cm)

3.70”

(9.4 cm)

1.10”

(2.8cm)

4.08”

(10.4 cm)

3.32” (8.4 cm)

1.125”

(2.9 cm)

Fig. 1 CXM539 High Speed Digital 3 Axis Fluxgate Magnetometer

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CXM539 User’s Manual

Doc.# 6001-0014 Rev1.2Page 5

4System Startup and Checkout

4.1 Startup Using a Terminal Emulator Program

Connect the CXM539 to the connection box using the supplied ribbon cable

(use 9 pin male on connection box). Connect a cable from a serial port on a

PC to the connection box (use 9 pin female on connection box). Select the

AUTO option on the connection box switch. This connects pin 1 (CD) of

the 9 pin serial interface connector to the configure port on the CXM539.

Note that on the 9 pin computer connector, pins 1, 4 and 6 are shorted and

pins 7 and 8 are shorted). Connect a power supply (+7.5 V to +15 V) to the

red (positive) and black banana plug on the connection box.

Alternatively, according to the I/O pin functions described in Chapter 3, use

the RS-232 interface when connecting to a PC com port.

Start up a terminal emulator program on the PC, e.g. Windows

HyperTerminal, PC Plus, etc. Configure the terminal emulator program for

direct connect toan available com port and select the baud rate 9600 with

one stop bit and no parity. On the electrical interface to the system ground

pin 8; this will put the system in configure mode and assure that the baud

rate is 9600 baud. If a connection box is used, select the “config” option on

the connector box switch.

Apply power to the system and check to see that the unit transmits a start up

message:

APS 539 V1.12 Config. Mode

The system can now be configured for operation in various modes as

described in Appendix A by issuing commands over the serial interface.

After configuring the CXM539 system, ungrounded pin 8. If a connector

box is used, select the “Run” option in the connector box switch. In run

mode, the CXM539 sign on message sent at power on is

APS 539 V1.12.

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CXM539 User’s Manual

Doc.# 6001-0014 Rev1.2Page 6

In run mode, most of the CXM539 parameters, e.g. baud rate, sample rate,

etc. can be set by the user. The main differences between the system

operation in run and configure mode are as follows:

1. The CXM539 can only be calibrated in config mode (by issuing

the l command). The unit is always factory calibrated and

recalibration by the user is not normally required.

2. The unit always starts in the (known) baud rate of 9600 baud.

3. The unit always starts in command mode (as opposed to autosend

mode).

4. The data output format is selected to be A to D count mode.

The main functions of the config mode are to assure that the CXM539

communicates using a known baud rate (9600) and to enable calibration of

the system.

MWARNING

Always operate the CXM539 in run mode (when using a terminal program)

unless the baud rate setting of the unit is unknown or calibration of the unit

is required. The output of the CXM539 in the calibrated mode (M=C) is

only valid in the run and auto modes.

4.2 System Checkout

After the CXM539 is operational and communicating with a computer, its

proper operation can be qualitatively checked out by using it to measure the

earth’s magnetic field. Around the globe, the magnitude of the earth’s

magnetic field varies from about 0.4 Gauss to 0.6 Gauss. In the northern

hemisphere, the field points north and dips into the ground (dip angle) at

about 60°.

Point the X axis generally north and down at an angle of 60° from

horizontal. Verify that the X axis reads about 0.5G and the Y and Z axis is

read near zero. Repeat the measurement with the Y and Z axes in turn

pointed into the field and verify that these two axes correctly read the

earth’s magnetic field magnitude.

If a terminal program is used before checking the system operation, ensure

that the following commands are given:

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