BW SENSING BWM826 Bedienungsanleitung

BWM826

*igital Dual-Axis Inclinometer

Technical Manual

BWM 826

Digital Dual-Axis Inclinometer

●Dual-axis inclination measurement

●Measuring range: ±30°

●Max accuracy: 0.005°

●Voltage input: 9~35V

●Output mode: RS485/RS232/TTL optional

●Operating temperature: -40℃~+85℃

●IP67 protection

●High vibration resistance>2000g

●High resolution: 0.001°

●Product size: L90*W40.5*H26（mm）

●Dangerous building monitoring

●Bridge monitoring

●Satellite antenna positioning

●Laser level

●Slope monitoring

●High-speed rail monitoring

●Piling monitoring

●Ancient building protection monitoring

Introduction

Features

Applications

technology and digital output. It has a measuring range of ± 30° and a full-scale accuracy of 0.005° and a

operating temperature of -40℃~+85℃. The product uses a high-accuracy MEMS accelerometer and a high-

resolution differential digital-to-analog converter with built-in automatic compensation and filtering

algorithms to reduce errors caused by environmental changes. It measures the change of static gravitational

field and converts it into angle change. The change directly outputs the horizontal angle value through

digital mode. It has high long-term stability, small temperature drift, simple use and strong resistance to

external interference. It apply to military equipment, industrial automation, surveying and mapping, etc.

Bewis Sensing Technology LLC

www.bwsensing.com Tel: +86 510 8573 7158

2000g, 0.5ms, 3 times/axis

150(package excluded)

Conditions

Indoor

-40～85℃

25℃

BWM826-5

±5

X-Y

0.005

0.001

±0.001

0.005

100

BWM826-15

±15

X-Y

0.008

0.001

±0.001

0.008

100

according to GBT17626

≥100 MΩ

≥90000 hours/time

BWM826-30

±30

X-Y

0.01

0.001

±0.001

0.01

100

°/℃

Units

BWM 826

Digital Dual-Axis Inclinometer

Parameters

Power supply

Operating current

Operating temperature

Store temperature

Conditions

Non-loaded

Min

-40

-55

Typical

Max

+85

+100

Units

℃

Specifications

Electrical Specifications

Performance Specifications

Measuring range

Measuring axis

Accuracy

Resolution

Frequency response

Electromagnetic

compatibility

Insulation resistance

Shock resistance

Weight（g）

Zero temperature

drift

MTBF

Cross axis error

Parameters

Resolution: The measured minimum change value that the sensor can detect and resolve within

the measurement range.

Accuracy: The error between the actual angle and the Root mean square(RMS) of the measured

angle of the sensor (≥16 times).

Bewis Sensing Technology LLC

www.bwsensing.com Tel: +86 510 8573 7158

40.5

4.5 hole

BWM 826

Digital Dual-Axis Inclinometer

Package size

Product Size: L90*W40.5*H26(mm)

Mechanical Characteristic

Connector

Protection level

Shell material

Installation

Metal connector（standard cable is 1.5m）

IP67

Magnesium alloy anodizing

Four M4 screws

Bewis Sensing Technology LLC

www.bwsensing.com Tel: +86 510 8573 7158

Hole Φ 2.1mm

3030

4141

4747

3636

Bare plate product size

Product size: L47*W36*H15(mm)

Note: ±1mm error for length and width dimensions, please refer to actual size.

RS232 output RS485/TTL output

BWM 826

Digital Dual-Axis Inclinometer

Installation direction

The correct installation method can avoid measurement error. The following points should be made

when installing the sensor:

First of all, to ensure that the sensor mounting surface and the measured surface completely close,

the measured surface should be as horizontal as possible, can not have the angle shown in Figure A

and Figure C, the correct installation is shown in Figure B and Figure D.

the measured surface

uneven surface

generates the

angle

the measured surface

C D

the measured surface the measured surface

Secondly, the bottom cable of the sensor and the axis of the measured object shouldn't generate

the angle shown in E. When installing, the bottom cable of the sensor should be kept parallel or

orthogonal to the rotation axis of the measured object. This product can be installed horizontally

or vertically (vertical installation requires customization). The correct installation method is shown in

Figure F.

Finally, the installation surface of the sensor must be fixed with the measured surface tightly and

smoothly, to avoid measurement error that may be caused by the acceleration and vibration.

uneven surface

generates the

angle

Bewis Sensing Technology LLC

www.bwsensing.com Tel: +86 510 8573 7158

RS 485 Electrical interfaces

RED

VCC

DC 9-35V

BLUE

BLACK

GND地

GREEN

485-

YELLOW

485+

Sensor

POWER+ POWER-

YELLOW: TXD

DC 9-35V

GREEN: RXD

BLACK: GND

485+

485-

Signal

acquisition

end

12.00V12.00V

POWER

9~35V

BWM 826

Digital Dual-Axis Inclinometer

Electrical connections

Cable color

Function

Bewis Sensing Technology LLC

www.bwsensing.com Tel: +86 510 8573 7158

RS232 Electrical interfaces

RED

VCC

DC 9-35V

BLUE

BLACK

GND

GREEN

RXD

YELLOW

TXD

Cable color

Function

Sensor

POWER+ POWER-

YELLOW: TXD

RED DC 9-35V 1

POWER

GREEN: RXD

BLACK: GND

9~35V

BWM 826

Digital Dual-Axis Inclinometer

Debug software

Users can directly download serial assistant on official website (Supports-Download). You can also use

more convenient and intuitive PC software.

BWM826 supporting serial debugging software can be connected to the inclinometer on the computer

for angle display. The software debugging interface is as shown in the figure below. Using the debug

software, it can conveniently display the current X-direction tilt angle, and you can also modify and

set other parameters by yourself.

①

②

③

Correctly connect the inclinometer serial port hardware and connect the power supply.

Select the computer serial port and baud rate and click connect Serial Port.

Click Start and the tilt angle of the X, Y Axis will be displayed on the screen.

Software use steps:

Bewis Sensing Technology LLC

www.bwsensing.com Tel: +86 510 8573 7158

BWM 826

Digital Dual-Axis Inclinometer

(nbyte)

Protocol

1Data Frame Format：

Data Format: Hexadecimal

Identifier: Fixed to 77

Frame Length: Length from Frame Length to Checksum（included）

Address Code: Address of acquiring module, default 0x00

Data: Content and length variable according to Command

Checksum: Sum of Frame Length, Address Code, Command and Data. (Please pay attention that

when the command or data changes, the checksum will change. )

（8 data bits，1 stop bit，No parity check，default baud rate 9600）

Identifier

（1byte）

0x77

Frame Length

（1byte）

Address Code

（2byte） Command

（1byte） Data Checksum

（1byte）

2 Command Format

2.1 Read angle of X axis Command：77 05 00 00 01 06

0x77 0x01

Command response：

0x77 0x81

Note: The data field is a 4-byte return angle value, which is a compressed BCD code, S is a sign bit (0 positive, 1

negative), XXX is a three-digit integer value, and YYY is a decimal value. The Data of other axis is the same

format. For example, 10 26 80 70 means -026.8070 °.

0x07

Frame Length

（1byte）

Address Code

（2byte） Command

（1byte）

Data

（0byte） Checksum

（1byte）

Frame Length

（1byte）

Address Code

（2byte） Command

（1byte）

Data

（4byte） Checksum

（1byte）

2.2 Read angle of Y axis Command：77 05 00 00 02 07

0x77 0x02

Command response：

0x77 0x82

Frame Length

（1byte）

Address Code

（2byte） Command

（1byte）

Data

（0byte） Checksum

（1byte）

Frame Length

（1byte）

Address Code

（2byte） Command

（1byte）

Data

（4byte） Checksum

（1byte）

SXXX.YYY0

Identifier

（1byte）

Identifier

（1byte）

Identifier

（1byte）

Identifier

（1byte）

Bewis Sensing Technology LLC

www.bwsensing.com Tel: +86 510 8573 7158

2.5 Set baud rate Command：77 06 00 00 0B 04 15

Note: 00:2400 01 :4800 02:9600 03:19200 04:115200, the default is 9600

Each time the communication baud rate is changed successfully, the response command is sent back at the

original baud rate, and then the device communication baud rate is changed immediately.

Note: If high frequency output is required, set the baud rate to 115200.

BWM 826

Digital Dual-Axis Inclinometer

2.3 Read angle of X,Y axis Command：77 05 00 00 04 09

0x77 0x04

Command response：

0x77 0x84

Frame Length

（1byte）

Address Code

（2byte） Command

（1byte）

Data

（0byte） Checksum

（1byte）

Frame Length

（1byte）

Address Code

（2byte） Command

（1byte）

Data

（12byte） Checksum

（1byte）

Note: The data field is a 12-byte return angle value, divided into three groups, each group of four compressed

BCD codes. They are the X-axis angle, the Y-axis angle, and the Z-axis (all 0). Each axis data format SXXX.YYY0, S is

a sign bit (0 positive, 1 negative) XXX is a three-digit integer value, YYY is a three-digit decimal value. The other

axis data is the same. For example, 10 26 87 60 means -026.8760°.

Such as: 77 11 00 00 84 00 02 01 30 10 00 51 20 00 00 00 00 49

Where 00 02 01 30 represents the X-axis angle of +2.013°, and 10 00 51 20 represents the Y-axis angle of -0.512°.

2.4 Set absolute/relative zero point Command：77 06 00 00 05 01 0C

Command response：

Note: absolute zero：Based on the factory-calibrated zero point.

relative zero: Reference to the zero after the current installation.

0x77 0x85 0x00: success

0xFF: failure

0x77 0x05

0x00: absolute zero

0x01: relative zero

Frame Length

（1byte） Address Code

（2byte） Command

（1byte）

Data

（1byte）

Checksum

（1byte）

Frame Length

（1byte）

Address Code

（2byte） Command

（1byte）

Data

（1byte）

Checksum

（1byte）

Command response：

0x77 0x8B 0x00: success

0xFF: failure

Frame Length

（1byte）

Address Code

（2byte） Command

（1byte）

Data

（1byte）

Checksum

（1byte）

0x77 0x0B

Frame Length

（1byte）

Address Code

（2byte） Command

（1byte）

Data

（1byte） Checksum

（1byte）

0x00

Identifier

（1byte）

Identifier

（1byte）

Identifier

（1byte）

Identifier

（1byte）

Identifier

（1byte）

Identifier

（1byte）

Bewis Sensing Technology LLC

www.bwsensing.com Tel: +86 510 8573 7158

Note: This command refers to whether the zero point reference used in the current state is relative zero or

absolute zero;

BWM 826

Digital Dual-Axis Inclinometer

Command response：

2.6 Save setting Command：77 05 00 00 0A 0F

0x77

Note: If Save setting command is not executed, all setting will be invalid after power off.

0x00: success

0xFF: failure

0x77 0x0A

0x8A

Frame Length

（1byte）

Address Code

（2byte） Command

（1byte）

Data

（1byte） Checksum

（1byte）

Frame Length

（1byte）

Address Code

（2byte） Command

（1byte）

Data

（1byte）

Checksum

（1byte）

Command response：

0x1F

0x77 0x1F

2.7 Query address Command：77 05 00 00 1F 24

Frame Length

（1byte）

Address Code

（2byte） Command

（1byte）

Data

（0byte） Checksum

（1byte）

Frame Length

（1byte）

Address Code

（2byte） Command

（1byte）

Data

（2byte）

Checksum

（1byte）

0x05

0x77

00x00

0x77

Command response：

2.8 Query relative / absolute zero Command：77 05 00 00 0D 12

0x0D

Frame Length

（1byte） Address Code

（2byte） Command

（1byte）

Data

（0byte）

Checksum

（1byte）

0x77 0x8D

0x00: absolute zero

0xFF: relative zero

Frame Length

（1byte） Address Code

（2byte） Command

（1byte）

Data

（1byte）

Checksum

（1byte）

Identifier

（1byte）

Identifier

（1byte）

Identifier

（1byte）

Identifier

（1byte）

Identifier

（1byte）

Identifier

（1byte）

Bewis Sensing Technology LLC

www.bwsensing.com Tel: +86 510 8573 7158

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