BW SENSING BWM400 User manual

BWM400
9KXOGRY
Digital Dual-Axis Inclinometer
Technical Manual

Designed by Bewis Sensing Technology LLC, BWM400 is a cost-effective digital dual-axis
inclinometer which output mode is RS485 and TTL optional. It adopts the latest technology MEMS
manufacturing process tilting unit, with small size, low power consumption, high consistency
and stability. Because it is a digital inclinometer, the linearity is more easily corrected. The
operating temperature reaches the industrial grade -40 ° C ~ +85 ° C.
When multi-section cascading is used, we provide a multi-section slanting algorithm, which can
accurately measure the displacement of large length and deep depth, and provides an automatic
calibration algorithm.
●Foundation pit monitoring
●Soil monitoring
●Dam tailings monitoring
●Exploration well monitoring
●Slope monitoring
●High-speed rail monitoring
●Piling monitoring
●Deep displacement
BWM 400
Digital Dual-Axis Inclinometer
Introduction
●Dual-axis inclination measurement
●Measuring range: ± 60°
●Accuracy: 0.005°
●Voltage input: 9~35V(DC)
●Output mode: RS485/TTL optional
Features
●Multi-section cascade
●Operating temperature: -40℃~+85℃
●High vibration resistance>2000g
●Resolution: 0.001°
●Volume: 1m cylindrical long measuring
oblique section, diameter 28.1mm
Applications
BEWIS SENSING TECHNOLOGY LLC
www.bwsensing.com Tel: [phone]

BWM 400
Digital Dual-Axis Inclinometer
Specifications
Electrical Specifications
Parameters
Power supply
Operating current
Operating
temperature
Store temperature
Min
9
20
-40
-55
Typical
30
Max
35
40
+85
+100
Units
V
mA
℃
℃
Conditions
Non-loaded
12
25
25
2000g,0.5ms,3times/axis
Conditions
Indoor
-40～85℃
25℃
BWM400-5
±5
X-Y
0.005
0.001
±0.001
0.005
100
BWM400-30
±30
X-Y
0.01
0.001
±0.001
0.01
100
according to GBT17626
≥100 MΩ
≥90000 hours/time
BWM400-60
±60
X-Y
0.05
0.001
±0.001
0.05
100
°
°
°/℃
Hz
Units
°
°
Performance Specifications
Measuring range
Measuring axis
Accuracy
Resolution
Frequency response
Electromagnetic
compatibility
Insulation resistance
Shock resistance
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: [phone]

RED
1
VCC
DC 9-35V
BLUE
2
NC
BLACK
3
GND
GREEN
4
B
485-
YELLOW
5
A
485+
1
RED VCC DC 9-35V
YELLOW TX
TTL wiring diagram
GND
1
3
4
5
GREEN RX
RED VCC DC 9-35V
YELLOW D+ 485+
485-
GND
Signal
acquisition
end
1
3
4
5
GREEN D-
BWM 400
Digital Dual-Axis Inclinometer
无锡北微传感科技有限公司 www.bwsensing.com Tel: [phone]
Electrical connectionss
Cable color
&
Function
Electrical interfaces
1
Inclinometer
1
1
Inclinometer
Signal
acquisition
end
BLACK GND
RS485 wiring diagram
BLACK GND
BEWIS SENSING TECHNOLOGY LLC
www.bwsensing.com Tel: [phone]

BWM 400
Digital Dual-Axis Inclinometer
Debug software
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 tilter in the X direction and Y-direction will be
displayed on the screen.
Users can directly download serial assistant on official website (Supports-Download). You can also use
more convenient and intuitive PC software.
BWS4000 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 and Y-direction tilt angle, and
you can also modify and set other parameters by yourself.
Software use steps:
Note: You can switch to Chinese or English version by the bottom left button.
BEWIS SENSING TECHNOLOGY LLC
www.bwsensing.com Tel: [phone]

BWM 400
Digital Dual-Axis Inclinometer
2.2 Read angle of Y axis Command：77 04 00 02 06
(Nbyte)
Protocol
1Data Frame Format：
Data Format: Hexadecimal(The following command interprets Table 0X as a hexadecimal identifier.
You do not need to enter 0X, such as 0x77, you only need to enter 77.)
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
（4byte） Command
（1byte） Data Checksum
（1byte）
2 Command Format
2.1 Read angle of X axis Command：77 04 00 01 05
0x77 0x01
Command response：
0x77 0x81 SXXX.YYY0
Identifier
（1byte Frame Length
（1byte）
Address Code
（4byte）
Command
（1byte）
Data
（0byte） Checksum
（1byte）
Identifier
（1byte Frame Length
（1byte）
Address Code
（4byte） Command
（1byte）
Data
（4byte） Checksum
（1byte）
0x77 0x02
Command response：
0x77 0x82 SXXX.YYY0
Identifier
（1byte Frame Length
（1byte）
Address Code
（4byte） Command
（1byte）
Data
（0byte）
Checksum
（1byte）
Identifier
（1byte
Frame Length
（1byte）
Address Code
（4byte） Command
（1byte）
Data
（4byte） Checksum
（1byte）
_
Note: The data field is a 4-byte return angle value, which is a compressed BCD code. S is the sign bit (0 means
positive, 1 means negative), XXX is the three digit integer part, YYY is the fractional part. The Data of other axis is
the same format. For example, 10 26 80 means -026.80 °.
_
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Note: The data field is a 16-byte return angle value divided into three groups of four compressed BCD codes.
They are the X-axis angle, the Y-axis angle, and the temperature. 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 13 00 00 00 00 84 10 09 15 50 00 07 54 10 00 23 08 40 EB
Where 10 09 15 50 represents the X-axis angle of -9.155°, and 00 07 54 10 represents the Y-axis angle of 7.541°.
BWM 400
Digital Dual-Axis Inclinometer
2.3 Read angle of X,Y axis Command：77 04 00 04 08
0x77 0x04
Command response：
0x77 0x84
Identifier
（1byte Frame Length
（1byte）
Address Code
（4byte） Command
（1byte）
Data
（0byte） Checksum
（1byte）
Identifier
（1byte Frame Length
（1byte）
Address Code
（4byte） Command
（1byte）
Data
（12byte） Checksum
（1byte）
2.4 Set absolute/relative zero point Command：77 08 00 00 00 00 05 01 0E
Command response：
0x77 0x85 0x00: success
0xFF: failure
0x77 0x05
0x00: absolute zero
0x01: relative zero
Identifier
（1byte
Frame Length
（1byte） Address Code
（4byte） Command
（1byte）
Data
（1byte）
Checksum
（1byte）
Identifier
（1byte
Frame Length
（1byte）
Address Code
（4byte） Command
（1byte）
Data
（1byte）
Checksum
（1byte）
0x77
Command response：
2.5 Query relative / absolute zero Command：77 07 00 00 00 00 0D 14
0x0D
Identifier
（1byte
Frame Length
（1byte） Address Code
（4byte） Command
（1byte）
Data
（0byte）
Checksum
（1byte）
0x77 0x8D
0x00: absolute zero
0xFF: relative zero
Identifier
（1byte
Frame Length
（1byte） Address Code
（4byte） Command
（1byte）
Data
（1byte）
Checksum
（1byte）
Note: This command refers to whether the zero point reference used in the current state is relative zero or
absolute zero.
Note: absolute zero：Based on the factory-calibrated zero point.
relative zero: Reference to the zero after the current installation.
BEWIS SENSING TECHNOLOGY LLC
www.bwsensing.com Tel: [phone]

Note: Set to answer mode, it must receive the read angle command to output the angle. When set to automatic
output system, it will automatically output X, Y axis angle and temperature after power-on. After setting, you need
to send save command (77 07 00 00 00 00 0A 11).
For example: set automatic output 5Hz transmission: 77 08 00 00 00 00 0C 01 15, return: 77 08 00 00 00 00 8C 00 94.
BWM 400
Digital Dual-Axis Inclinometer
2.6 Set output mode Command：77 08 00 00 00 00 0C 00 14
0x77 0x0C
0x00: question and answer Mode
0x01: 5Hz Data Rate
0x02: 10Hz Data Rate
0x03: 20Hz Data Rate
0x04: 25Hz Data Rate
0x05: 50Hz Data Rate
0x06: 100Hz Data Rate
0x77 0x8C 0x00: success
0xFF: failure
0x05
（1byte
Frame Length
（1byte）
Address Code
（4byte）
Command
（1byte） Data
（0byte） Checksum
（1byte）
Identifier
Identifier
（1byte
Frame Length
（1byte）
Address Code
（4byte） Command
（1byte）
Data
（1byte） Checksum
（1byte）
Note: The default output mode is 00. When setting the 100Hz output frequencies, you need to adjust the baud
rate to 115200.
Command response：
0x05
0x77
Command response：
2.7 Set baud rate Command： 77 08 00 00 00 00 0B 00 13
0x0B
Note：For data, 00: 2400, 01: 4800, 02: 9600, 03: 19200，04: 115200，Default 02:9600.
0x77 0x8B 0x00: success
0xFF: failure
Identifier
（1byte Frame Length
（1byte）
Address Code
（4byte） Command
（1byte）
Data
（1byte）
Checksum
（1byte）
Identifier
（1byte
Frame Length
（1byte） Address Code
（4byte） Command
（1byte）
Data
（1byte）
Checksum
（1byte）
00:2400
01:4800
02:9600
03:19200
BEWIS SENSING TECHNOLOGY LLC
www.bwsensing.com Tel: [phone]

BWM 400
Digital Dual-Axis Inclinometer
0x77
Command response：
2.8 Set address Command: 77 0B 00 00 00 00 0F 12 34 56 78 2E
0x0F
0x77 0x8F 0x00: success
0xFF: failure
XXXX
Module
address
Identifier
(1byte)
Frame Length
（1byte） Address Code
（4byte）
Command
（1byte） Data
（4byte）
Checksum
（1byte）
Identifier
(1byte)
Frame Length
（1byte）
Address Code
（4byte）
Command
（1byte） Data
（1byte）
Checksum
（1byte）
Command response：
2.9 Save setting Command：77 07 00 00 00 00 0A 11
0x77
Note: If Save setting command is not executed, all setting will be invalid after power off.
0x00: success
0xFF: failure
0x77 0x0A
0x8A
Identifier
（1byte Frame Length
（1byte）
Address Code
（4byte） Command
（1byte）
Data
（0byte） Checksum
（1byte）
Identifier
（1byte
Frame Length
（1byte）
Address Code
（4byte） Command
（1byte）
Data
（1byte）
Checksum
（1byte）
Command response：77 0B 12 34 56 78 1F 12 34 56 78 52
0x1F
0x77 0x1F
2.10 Query address Command：77 07 00 00 00 00 1F 26
Identifier
(1byte)
Frame Length
（1byte）
Address Code
（4byte） Command
（1byte）
Data
（0byte） Checksum
（1byte）
Identifier
(1byte)Frame Length
（1byte）
Address Code
（4byte） Command
（1byte）
Data
（4byte） Checksum
（1byte）
0x07
0x77
BEWIS SENSING TECHNOLOGY LLC
www.bwsensing.com Tel: [phone]

BWM 400
Digital Dual-Axis Inclinometer
BEWIS SENSING TECHNOLOGY LLC
www.bwsensing.com Tel: [phone]
Ordering Information
Executive standard
●Enterprise Quality System Standard: ISO9001:2008 Standard (Certificate No.:10114Q16846ROS)
●CE certification (certificate number: 3854210814)
●ROHS (certificate number: SO81426003)
●GB/T 191 SJ 20873-2003 General specifications for tiltmeters and spirit levels
●GBT 18459-2001 sensor main static performance index calculation method
●JF 1059-1999 Evaluation and Expression of Measurement Uncertainty
●GBT 14412-2005 mechanical vibration and shock mechanical installation of accelerometer
●General requirements for GJB 450A-2004 equipment reliability
●Quality control of key parts and important parts of GJB 909A
●GJB 899 Reliability Qualification and Acceptance Test
●GJB 150-3A high temperature test
●GJB 150-4A low temperature test
●GJB 150-8A rain test
●GJB 150-12A dust test
●GJB 150-16A vibration test
●GJB 150-18A impact test
●GJB 150-23A Tilt and Swing Test
●GB/T 17626-3A RF electromagnetic radiation immunity test
●GB/T 17626-5A surge (hit) impulse immunity test
●GB/T 17626-8A power frequency magnetic field immunity test
●GB/T 17626-11A voltage dips, short interruptions and voltage changes immunity
Product number Way of communication Package condition
Oblique section
Oblique section
RS485
BWM400-60-485
BWM460-60-TTL TTL

BWM400
Serials
Digital Dual-Axis Inclinometer
Wuxi Bewis Sensing Technology LLC
Address: Building 30, No. 58 Xiuxi Road, Binhu District, Wuxi City
Hotline: [phone]
Tel: [phone]-801
Email: [email protected]
Website: www.bwsensing.com