BW SENSING BWN467 User manual

BWN467
Cost-effective Dual-Axis
Digital Output with Modbus
Inclinometer
Technical Manual

BWN467 is a cost-effective digital dual-axis inclination sensor bare board launched by Bewis Sensing
Technology LLC. The output mode is RS485 and TTL optional. It can be used vertically or horizontally. The
product adopts the latest technology micro-electromechanical production technology inclination unit, small
size, low power consumption, high consistency and stability, because it is a digital inclination sensor, the
linearity is easier to be corrected. The working temperature reaches industrial level -40℃～+85℃, it is a very
cost-effective inclination sensor.
When multiple sections are used in cascade, our company provides a multi-section tilt measurement
algorithm, which can achieve accurate displacement measurement of larger length and deeper depth, and
provides an automatic calibration algorithm.
●Biaxial inclination measurement
●Range：±30°
●Accuracy：0.01°
●Wide voltage input：9～35VDC
●Output mode: RS485/TTL optional with Modbus
●Multi-section cascade can be used
●Wide temperature work:-40℃～+85℃
●High vibration resistance>2000g
●Resolution：0.001°
●Bare board volume：67×20×8mm
BWN 467
Cost-effective Dual-Axis Digital Output with Modbus Inclinometer
●Foundation pit monitoring
●Soil monitoring
●Dam tailings monitoring
●Exploration well
● Slope monitoring
● High-speed rail foundation monitoring
● Piling monitoring
●Deep displacement
Bewis Sensing Technology LLC
www.bwsensing.com Tel: [phone]
Introduction
Features
Applications

BWN 467
Cost-effective Dual-Axis Digital Output with Modbus Inclinometer
Bewis Sensing Technology LLC
www.bwsensing.com Tel: [phone]
Specifications
Electrical Specifications
Parameters
Power supply(DC)
Operating current
Operating temperature
Store temperature
Conditions
Non-loaded
Min
9
20
-40
-55
Typical
12
30
Max
35
40
+85
+100
Units
V
mA
℃
℃
25
25
Performance Specifications
2000g,0.5ms,3times/axis
Conditions
Indoor
BWM467
±30
X-Y
0.01
0.001
±0.001
100
According to GBT17626
≥100 MΩ
≥100000 h
°
°
°/℃
Hz
Units
°
Measuring range
Measuring axis
Accuracy
Resolution
Frequency response
Electromagnetic
compatibility
Insulation resistance
Shock resistance
Zero temperature
drift
MTBF
Parameters
Max
-40~+85℃
Cross axis error 25℃0.01°
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).

BWN 467
Cost-effective Dual-Axis Digital Output with Modbus Inclinometer
Bewis Sensing Technology LLC
www.bwsensing.com Tel: [phone]
Mechanical Characteristic
Connector
Protection level
Shell material
Installation
Line hole
Bare board
Bare board
Four M2 screws
Package size
Product Size: L62*W20*H8（mm）
15
20
62
67
Circuit board schematic

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
AB
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: [phone]
F
Axis A
Axis B
Parallel
Parallel
Axis A
Axis B
EF
BWN 467
Cost-effective Dual-Axis Digital Output with Modbus Inclinometer

BWN 467
Cost-effective Dual-Axis Digital Output with Modbus Inclinometer
Bewis Sensing Technology LLC
www.bwsensing.com Tel: [phone]
RED
1
VCC
9-35VDC
BLUE
2
NC
BLACK
3
GND
GREEN
4
RXD
（485-）
YELLOW
5
TXD
（485+）
Electrical connectionss
RS 485 wiring definition
Cable color
&
Function
485+
485-
RS 485 wiring diagram
SensorSensor
RREEDD VVCCCC 9-35VDC
BBLLAACCK K GGNNDD GGNNDD
11
33
44
55
GGRREEEEN N DD--
InclinometerInclinometer SignalSignal 6666
2222
acquisitionacquisition
endend
YELLOWYELLOW D+D+
BBLLAACCK K GGNNDD
TTL wiring diagram
SensorSensor
GGNNDD
11
33
44
55
GGRREEEEN N DD--
InclinometerInclinometer SignalSignal 6666
2222
acquisitionacquisition
endend
YELLOWYELLOW D+D+
RREEDD VVCCCC 9-35VDC
1
3
4
5
GND
9-35VDC
1
5
4
2
3
6
7
8
9
BLACK GND
YELLOW TXD
RED VCC
GREEN RXD
RS 232 wiring diagram
Inclinometer
BLACK GND

BWN 467
Cost-effective Dual-Axis Digital Output with Modbus Inclinometer
Note: P1 and P2 correspond to the same number
wiring, RX and TX of P3 are the receiving and sending
ends of TTL.
When RS485 is selected, VCC (9~35V), GND, AH (485+),
BL (485-) of P1 or P2 can be connected;
When TTL is selected, connect VCC (9~35V) of P1 or P2,
GND, and RX and TX of P3. The TX (transmitting end) of
the collecting end is connected to the RX (receiving
end) of the sensor P3, and the RX (receiving end) of the
collecting end is connected to the sensor. P3 TX
(transmitter)
Bewis Sensing Technology LLC
www.bwsensing.com Tel: [phone]

BWN 467
Cost-effective Dual-Axis Digital Output with Modbus Inclinometer
Bewis Sensing Technology LLC
www.bwsensing.com Tel: [phone]
Debug software
Users can directly download serial assistant on official website (Supports-Download). You can also
use more convenient and intuitive PC software.
BWM467 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
4
Correctly connect the inclinometer serial port hardware and connect the power supply.
Choose the correct device model. 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 will be displayed on the screen.
Software use steps:

BWN467
Cost-effective Dual-Axis Digital Output with Modbus Inclinometer
Bewis Sensing Technology LLC
www.bwsensing.com Tel: [phone]
1 Data Frame Format： （8 data bits, 1 stop bit, non verification, default rate 9600）
Address
Code
（1byte）
0x01
Function
Code
（1byte）
0x03（read）
0x06（write）
The first low
address
register
（1byte）
xx xx
xx
xx xxxx
The first high
address
register
（1byte）
High
register
number
（1byte）
Low register
number
（1byte）
Checksum
(2byte）
Data format: Hexadecimal
Address code: Default 01 (note: it should not exceed 255)
Function Code: 03 represents reading register,06 represents presetting register.
Register Address: the starting address the register need to be operated
Register amount: the amount need to operate
Checksum: it is calculated by the host. (We recommend that users need to use the CRC calculation software.)
2 Command Format：
Protocol
2.1 Read angle of X-axis Command: 01 03 00 01 00 01 D5 CA
0x00 0x01 0xD5CA
0x01 0x03
Command response:
Note: The data field is a hexadecimal number (PLC or configuration software reads the data directly with a 16-bit
register is decimal). After converting to decimal, the real data = (data field -10000)/100. If the data field is 3D52, it
is converted to decimal 15698, real data = (15698-10000)/100 = 56.98 degrees; the data field is 1230, converted
into decimal 4656, real data = (4656-20000)/100 = -53.44 degree.
0x00 0x01
Address
Code
（1byte）
Function
Code
（1byte）
The first low
address
register
The first high
address
register
High
register
number
Low register
number
Checksum
(2byte）
xx xxxx
0x01 0x03 0x02 xx
Address
Code
（1byte）
Function
Code
（1byte）
High
number
（1byte）
Number of
bytes
（1byte）
Low
number
（1byte）
Wrong CRC
checksum
(2byte）
2.2 Read angle of Y-axis Command: 01 03 00 02 00 01 25 CA
0x00 0x01
0x01 0x03 0x00 0x02
Address
Code
（1byte）
Function
Code
（1byte）
The first low
address
register
The first high
address
register
High
register
number
Low register
number
Checksum
(2byte）
xxxx

BWN 467
Cost-effective Dual-Axis Digital Output with Modbus Inclinometer
Bewis Sensing Technology LLC
www.bwsensing.com Tel: [phone]
Command response:
xx xxxx
0x01 0x03 0x02 xx
Address
Code
（1byte）
Function
Code
（1byte） （1byte）
Number of
bytes
（1byte） （1byte）
Checksum
(2byte）
Data field
high
Data field
low
2.3 Read angle of both X-axis and Y-axis Command: 01 03 00 01 00 02 95 CB
0x01 0x03
X axis Angle
（2byte）
Y axis Angle
（2byte）
0x04 xx xxxxxx
xx xx
0x00
0x01
0x01 0x03 0x00 0x02
Address
Code
（1byte）
Function
Code
（1byte）
The first low
address
register
The first high
address
register
High
register
number
Low register
number
（1byte）
Checksum
(2byte）
xxxx
Address
Code
（1byte）
Function
Code
（1byte）
Number of
bytes
（1byte）
Checksum
(2byte）
Command response:
Command response:
Address Code
(1byte)
0x01
Function Code
(1byte)
The high address
register (1byte)
The low address
register (1byte) Data field
(2byte)
Checksum
(2byte)
0x0A
0000:
absolute zero
0001:
relative zero
Command:01 06 00 0A 00 00 A9 C8
2.4 Set relative/absolute zero
0x06 0x00
Address Code
(1byte)
0x01
Function Code
(1byte)
The first high
address register
(1byte)
The first low
address register
(1byte)
Data field
(2byte)
Checksum
(2byte)
0x0A
0000:
absolute zero
0001:
relative zero
0x06 0x00
Note: absolute zero：Based on the factory-calibrated zero point.
relative zero: Reference to the zero after the current installation.
0xA9 C8
0xA9 C8
0x68 08
2.5 Set communication rate Command: 01 06 00 0B 00 02 79 C9
Command response:
0x0002 0x79 C9
0x01
Address Code
(1byte)
Function Code
(1byte)
The high address
register (1byte)
The low address
register (1byte)
Data field
(2byte)
Checksum
(2byte)
0x0B
0x06 0x00
0x0002 0x79 C9
0x01
Address Code
(1byte)
Function Code
(1byte)
The high address
register (1byte)
The low address
register (1byte)
Data field
(2byte)
Checksum
(2byte)
0x0B
0x06 0x00

BWN 467
Cost-effective Dual-Axis Digital Output with Modbus Inclinometer
Note: XXXX means the address range to be modified is 0000~00FF
Bewis Sensing Technology LLC
www.bwsensing.com Tel: [phone]
Note: 0000 represents 2400; 0001 represents 4800; 0002 represents 9600; 0003represents 19200.
The default is 0002:9600.
Command response:
2.6 Set module address Command: 01 06 00 0D 00 01 D9 C9
Address Code
(1byte)
0x01
Function Code
(1byte)
The high address
register (1byte)
The low address
register (1byte)
Data field
(2byte)
Checksum
(2byte)
0x0D
0x06 0x00 XXXX
XXXX
Address Code
(1byte)
Function Code
(1byte)
The high address
register (1byte)
The low address
register (1byte)
Data field
(2byte)
Checksum
(2byte)
0x0D
0x06 0x00 XXXX
XXXX
XXXX
2.7 Save settings Command: 01 06 00 0F00 00 B9 C9
Command response:
Note: If Save setting command is not executed, all setting will be invalid after power off.
0x0000 0xB9C9
0x01
Address Code
(1byte)
Function Code
(1byte)
The high address
register (1byte)
The low address
register (1byte)
Data field
(2byte)
Checksum
(2byte)
0x0F
0x06 0x00
register
register
（1byt（1byte）e） addressaddress
reregisterregister
Data fieldData field Checksum
Checksum
（2byt（2byte）e）
The highThe high
numbernumber
0x00
AddressAddress
CodeCode
（1byt（1byte）e）
0x010x01
FunctionFunction
CodeCode
The lowThe low
0x0F 0x0000
0x06 0x00 0xB9 C9
TheThe high high
addressaddress
registerregister (2byte)(2byte)

BWM 467
Cost-effective Dual-Axis Digital Output with Modbus Inclinometer
Executive standard
●Enterprise Quality System Standard: ISO9001:2015 Standard (Certificate No. 23919Q10455R0S）
●CE certification (certificate number: M.2019.103.UY1151)
●RoHS ( certificate number: G190930099)
Bewis Sensing Technology LLC
www.bwsensing.com Tel: [phone]

BWN467
Cost-effective Dual-Axis
Digital Output with Modbus
Inclinometer
Wuxi Bewis Sensing Technology LLC
Address: Building 30, No. 58 Xiuxi Road, Binhu District, Wuxi City, Jiangsu Province, China
Tel/Whatsapp: [phone]
Email: [e-mail]
Website: www.bwsensing.com