BW SENSING BWM415 Series User manual

BWM415
Serials
CAN Bus Single-Axis Inclinometer
Technical Manual

●Single-axis inclination measurement
●Resolution: 0.001°
●Product size: L90*W40.5*H26(mm)
●Voltage input: 9~35V
●Max accuracy: 0.01°
●Measuring range: ±180°
●Way of communication: CAN
●IP67 protection
●Industrial automatic leveling
●Medical devices
●The automatic tracking system of solar angle
●Tower tilt monitoring
●Hoisting angle control
●Structural deformation monitoring
●Measuring and mapping instrument
●Military equipment automation
Introduction
Features
Applications
Designed by Bewis Sensing Technology LLC, BWM415 is a cost-effective single-axis inclinometer
with MEMS technology and CAN output. It has a measuring range of ± 180° and a full-scale
accuracy of 0.01° 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.
BWM 415
CAN BUS Single-Axis Inclinometer
Bewis Sensing Technology LLC
www.bwsensing.com Tel: [phone]

BWM415-180
±180
X
0.01
0.001
±0.008
100
BWM415-90
±90
X
0.01
0.001
±0.008
100
2000g,0.5ms,3times/axis
150g(Include box)
Conditions
Indoor
BWM415-30
±30
X
0.01
0.001
±0.008
100
according to GBT17626
≥100 MΩ
≥30000 hours/time
°
°
°/℃
Hz
Units
°
Specifications
Electrical Specifications
Performance Specifications
Measuring range
Measuring axis
Accuracy
Resolution
Frequency response
Electromagnetic
compatibility
Insulation resistance
Shock resistance
N.W.
Zero temperature
drift
MTBF
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).
BWM 415
CAN BUS Single-Axis Inclinometer
Parameters
Power supply
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
BWM415-60
±60
X
0.01
0.001
±0.008
100
-40～85℃
Bewis Sensing Technology LLC
www.bwsensing.com Tel: [phone]

Mechanical Characteristic
Connector
Protection level
Shell material
Installation
Metal connector（standard cable is 1.5m）
IP67
Magnesium alloy anodizing
Four M4 screws
孔Φ 2.1mm
30
41
47
36
Package size
Product Size: L90*W40.5*H26(mm)
90
78
29
40.5
4
11 26
4.5 通孔
Bare plate product size
Product size: L47*W36*H15(mm)
Note: ±1mm error for length and width dimensions, please refer to actual size.
BWM 415
CAN BUS Single-Axis Inclinometer
Bewis Sensing Technology LLC
www.bwsensing.com Tel: [phone]

Installation direction
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.
BWM 415
CAN BUS Single-Axis Inclinometer
This series of products can only be installed vertically (pendulum type measurement), can not be installed
horizontally, the correct installation method can avoid measurement errors, the following points should be
done when installing the sensor:
First of all, to ensure that the sensor mounting surface is completely close to the measured surface, the
measured surface should be as horizontal as possible, and there should be no angle shown in Figure A and
Figure C. The correct installation method is shown in Figure B and Figure D.
the measured surface
the measured surface
C
D
the measured surface
the measured surface
A
B
uneven surface
generates the
angle
uneven surface
generates the
angle
Bewis Sensing Technology LLC
www.bwsensing.com Tel: [phone]

CAN Electrical interfaces
RED
1
VCC
DC 9-35V
BLUE
2
NC
BLACK
3
GND
GREEN
4
YELLOW
5
Cable color
&
Function
1
5
4
3
Sensor
POWER+ POWER-
YELLOW:
RED: DC 9-35V
POWER
GREEN:
BLACK: GND
9~35V
12
3
4
5
67
BWM 415
CAN BUS Single-Axis Inclinometer
CAN L CAN H
CAN H
CAN L
Signal
acquisition
end
Bewis Sensing Technology LLC
www.bwsensing.com Tel: [phone]

BWM 415
CAN BUS Single-Axis Inclinometer
Protocol
CAN includes 8 bytes. It will adds 0 to it when the date bytes is not enough. Sending the first byte 0x40
indicates a write command, and returning the first byte 0x40 indicates that the write was successful. The ID is
the CAN communication node number.
2)Set CAN’s baud rate
Note: the fifth byte (Baud) means 0x01,0x02, 0x03, 0x04.
0x01 means to set 500k bps as the baud rate.
0x02 means to set 250k bps as the baud rate.
0x03 means to set 125k bps as the baud rate.
0x04 means to set 100k bps as the baud rate.
The default baud rate is 125k bps. Once you revise
the baud rate and want to make a success revise, the
sensor need to be re-powered.
The lower the baud rate, the shorter the
communication distance. The communication
distance can reach 1000m or more at 25KF.
3)Set relative / absolute zero
1)Modify the nodes
(ID=0x01~0x7F),default ID=0x05
send
response
CAN-ID
0x600+0x05
0x580+0xID
The first
byte
0x40
0x40
second
0x10
0x10
third
0x10
0x10
fourth
0x00
0x00
fifth
ID
ID
sixth
0x00
0x00
seventh
0x00
0x00
eighth
0x00
0x00
Note: If the controller send CAN-ID=0x600+0x05(default), send data:40 10 10 00 10 00 00 00
send
response
CAN-ID
0x600+0x05 0x40 0x20 0x10 0x00 Baud 0x00 0x00 0x00
CAN-ID
0x600+0x05 0x10 0x00 Type 0x00 0x00 0x00
0x580+0x05 0x40 0x05 0x10 0x00 0x00 0x00 0x00 0x00
Note: The fifth byte means 0x00 and 0x01.
0x00 indicates the setting is an absolute zero,0x01 indicates a relative zero.
After setting the zero point, you need to enter the save command to set it successfully. (Default is absolute zero)
Absolute zero: Based on the factory-calibrated zero point.
Relative zero: Reference to the zero after the current installation.
send
response
0x40 0x05
If the sensor return CAN-ID=0x580+0x10, return data:40 10 10 00 10 00 00 00
The CAN-ID is 0x590 (0x580+0x10), indicating that the ID modification is successful. At this time, when
sending other naming, the CAN-ID needs to be changed to 0x610 to be successfully transmitted.
The first
byte second third fourth fifth sixth seventh eighth
The first
byte second third fourth fifth sixth seventh eighth
Bewis Sensing Technology LLC
www.bwsensing.com Tel: [phone]

BWM 415
CAN BUS Single-Axis Inclinometer
4)Query relative/ absolute zero
send
response
CAN-ID
0x600+0x05 0x10 0x00 0x00 0x00 0x00 0x00
0x580+0x05 0x40 0x05 0x10 0x00 Type 0x00 0x00 0x00
Note: The fifth byte means 0x00 and 0x01. 0x00 indicates an absolute zero and 0x01 indicates a relative zero.
0x40 0x0d
5)Save the setting
Note: For some parameter, revised parameter doesn't work until you send the saving command.
6) Read angle of X-axis
7)Set the output mode
The first
byte second third fourth fifth sixth seventh eighth
send
response
CAN-ID
0x600+0x05 0x10 0x00 0x00 0x00 0x00 0x00
0x580+0x05 0x40 0x0a0x10 0x00 0x00 0x00 0x00 0x00
0x40 0x0a
The first
byte second third fourth fifth sixth seventh eighth
send
response
CAN-ID
0x600+0x05 0x10 0x00 mode 0x00 0x00 0x00
0x580+0x05 0x40 0x0c 0x10 0x00 mode 0x00 0x00 0x00
0x40 0x0c
The first
byte second third fourth fifth sixth seventh eighth
Note: The fifth byte mode is 0x00,0x01,and the 0x00 is 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(default)
5Hz Data Rate means that 5 sets of angle data are automatically output every second, other modes
are similar to this. Sending other naming should be recommended in the answer mode (automatic
mode is non-stop output the current angle of the axis, in the answer mode to make it easier to see
other command return values).
Note: Reading angle command can be effective under the response mode.
Xsign is the sign bit of the X axis, 00 is positive and 10 is negative;
XH is an integer bit of the X-axis angle(2 integer bits) ;
XL is the decimal place of the X-axis angle(4 decimal places);
For example, if the returned data is 585 00 12 34 50 00 00 00 00, the X-axis angle is +12.3450 degrees.
send
response
CAN-ID
0x600+0x05 0x10 0x00 0x00 0x00 0x00 0x00
0x580+0x05 Xsign XHXL XL 0x00 0x00 0x00 0x00
0x40 0x04
The first
byte second third fourth fifth sixth seventh eighth
Bewis Sensing Technology LLC
www.bwsensing.com Tel: [phone]

BWM 415
CAN BUS Single-Axis Inclinometer
Note: The output angle format is the same as the answer mode read X angles.
9)Set the type of CAN-ID
Note: XX means 00 and 01. 00 means the standard ID type (11 bits) and 01 means extended ID type (27 bits).
The default type is the standard one.
10)Set the standard address of CAN-ID
Note: The default standard CAN-ID is 0x580+05 and the maximum is not more than 7FF. Here we revise'580' in
'0x580+05', 05 can be modified through the front nodes. After revise, the CAN-ID will become 0xXHXL+0x05
when re-powered on.
For example, send the data: 605 40 71 10 00 01 23 00 00, the CAN-ID will become 123+5=128 when it is
repowered on.
8)Inclinometer sensor automatically outputs the angle
When the sensor is set to automatic mode output, the sensor automatically outputs the angle according to a
certain frequency after the sensor is powered on.
send
response
CAN-ID
0x580+0x05
The first
byte second third fourth fifth sixth seventh eighth
send
response
CAN-ID
0x600+0x05 0x10 0x00 XX 0x00 0x00 0x00
0x40 0x70
The first
byte second third fourth fifth sixth seventh eighth
send
response
CAN-ID
0x600+0x05 0x10 0x00 XHXL 0x00 0x00
0x40 0x71
The first
byte second third fourth fifth sixth seventh eighth
Xsign XH XL XL 0x00 0x00 0x00
0x00
Bewis Sensing Technology LLC
www.bwsensing.com Tel: [phone]

BWM 415
CAN BUS Single-Axis Inclinometer
11)Set the extended address of CAN-ID
We need to divide the address into two when setting the address of extended CAN-ID. First send high 16
address, then send the low 16 address. The CAN-ID address will change into new one (here the CAN-ID
address we receive do not need to add the nodes) after being re-powered on. The maximum can not be
more than 0x1FFFFFFF. The default is 0x18fa0216.
ⅠSet high 16 extended address of CAN-ID
Note: the high 16 address can not surpass 0X1FFF.
Ⅱ Set low 16 extended address of CAN-ID
Note: Low 16 address can not surpass FFFF.
For example, send the data respectively as follows, 605 40 72 10 00 01 23 00 00 and 605 40 73 10 00 45 67 00 00.
CAN-ID will change into 01234567 after being re-powered on.
send
response
CAN-ID
0x600+0x05 0x10 0x00 XH XL 0x00 0x00
0x40 0x72
The first
byte second third fourth fifth sixth seventh eighth
send
response
CAN-ID
0x600+0x05 0x10 0x00 XH XL 0x00 0x00
0x40 0x73
The first
byte second third fourth fifth sixth seventh eighth
Bewis Sensing Technology LLC
www.bwsensing.com Tel: [phone]