BW SENSING AS400 Series User manual

AS400 Series
High sensitive low zero drift
3-Axis accelerometer
Technical Manual
V3.0

AS400
High sensitive low zero drift 3-axis accelerometer
Bewis Sensing Technology LLC www.bwsensing.com Tel：[phone]
Feature
Introduction
AS400 is a high-sensitivity low-zero drift digital output triaxial accelerometer developed
by Bewis Sensing Company. It is suitable for different industrial fields such as vibration
monitoring and impact testing. The product adopts digital interface and has communication
such as RS485/RS232/TTL. AS400 frequency bandwidth is DC-100Hz, three-axis measurement,
can work in the temperature range of -40°~+85°C. Detailed specifications can be found in the
technical data
● Measurement range：±3.6g
● Linearity：0.02%
● Working temperature range：-40 – 85℃
● Noise：20μg/√Hz
● Zero drift：0.01%/year
● Power supply： 9~36V
Application
● Wind Fan shake monitoring
● Building monitoring
● Seismic signal detection
● Bridge deflection monitoring
● Tunnel and dam monitoring
● Machinery and equipment health monitoring

Bewis Sensing Technology LLC www.bwsensing.com Tel：[phone]
AS400
High sensitive low zero drift 3-axis accelerometer
Product Feature
Performance index
Electrical index
Parameter
Condition
Min
Typ
Max
Unit
Power supply
9
36
V
Working current
No load
20
30
40
mA
Operating temperature
-40
+85
℃
Storage temperature
-55
+100
℃
Technical Parameters
Condition
Index parameter
Unit
Measuring range
Tria-xial
±3.6
g
Resolution
0.1
mg
Zero bias
±3.6g
0.5
mg
Linear error
0.02
%
Noise density
20
μg/√Hz
RMS total noise
0.06
mg
Response bandwidth
100
Hz
Sampling rate
100
Hz
Temperature drift
-40 ~125℃
2
mg
Zero drift
0.01
%
Resonance frequency
1K
Hz
Operating temperature
-40 - 85
℃
Protection level
IP67
Power
≤0.5
W

AS400
High sensitive low zero drift 3-axis accelerometer
Package size
PCB size
Mechanical Index
Connector
Metal joint （cable 1.5m)
Protection level
IP67
Shell material
Magnesium alloy oxidation
Installation
Three M4 screws
Product size：L90*W40.5*H26（mm）
The front device is 3.85mm, the back is 2.5mm, and the board thickness is 2.0mm
Bewis Sensing Technology LLC www.bwsensing.com Tel：[phone]

AS400
High sensitive low zero drift 3-axis accelerometer
C
D
A
B
uneven surface
generates the
angle
Bewis Sensing Technology LLC www.bwsensing.com Tel：[phone]
Installation
The correct installation method can avoid measurement errors. When installing the sensor, please
do the following:
First of all, make sure that the sensor mounting surface is completely close to the measured surface,
and the measured surface should be as level as possible. There should be no included angles as shown
in Figure A and FigureC. The correct installation method is shown in Figure B and Figure D.
the measured surface the measured surface
uneven surface
generates the
angle
the measured surface the measured surface
Secondly, the bottom line of the sensor and the axis of the measured object cannot have an angle as
shown in Figure E, and the bottom line of the sensor should be kept parallel or orthogonal to the axis of
rotation of the measured object during installation. This product can be installed horizontally or vertically
(vertical installation needs to be customized), and the correct installation method is shown in Figure F.
+X
Finally, the mounting surface of the sensor and the surface to be measured must be tightly fixed,
smooth in contact, and stable in rotation Please refer to the actual installation direction for the
actual installation direction.

AS400
High sensitive low zero drift 3-axis accelerometer
Bewis Sensing Technology LLC www.bwsensing.com Tel：[phone]
接线定义
RED VCC
DC9-35
YELLOW D+
485+
GREEN D-
Signal
acquisition
485-
terminal
BLACK GND
GND
1
5
DC9-35V
1
6
Yellow TXD
2
Accelerometer 4
GREEN RXD
7
3
8
3
BLACK GND
4
GND
Electrical connections
Wiring color
function
RED
BLUE
BLACK
GREEN
YELLOW
1
2
3
4
5
VCC
DC 9-35V
NC
GND
RXD
（B、D-）
TXD
（A、D+）
RS 485 Wiring diagram
RS 232 Wiring diagram
RED VCC

AS400
High sensitive low zero drift 3-axis accelerometer
Bewis Sensing Technology LLC www.bwsensing.com Tel：[phone]
Debugging software
You can download the serial debugging assistant directly in the official website (Technical
Service->Download Area), or you can use the more convenient and intuitive PC software. The
BWAS400 serial port debugging software can connect the acceleration sensor to the computer
for
data display. The software debugging interface is shown in the figure below, and other
parameters
can be modified and set.
Steps：
① Connect the serial port hardware of the accelerometer correctly and connect the power
supply.
② Select the computer serial port and baud rate and click to connect to the serial port.
③ Click Start and the current data will be displayed on the screen.

AS400
High sensitive low zero drift 3-axis accelerometer
Bewis Sensing Technology LLC www.bwsensing.com Tel：[phone]
Protocol
1 Data frame format：1（8 data bits，1 stop bit，No parity check，default baud
rate 9600）
Identifier
（1byte）
Data length
（1byte）
Address code
（1byte）
Command
word
（1byte）
Data area
（Xbyte）
Checksum
（1byte）
0x77H
Data Format: Hexadecimal Identifier: Fixed to 77
Data Length: Length from Frame Length to Checksum（included）
Address code：The address of the acquisition module, the default is 00
Data area：Content and length variable according to Command
Checksum：Accumulated sum of data length, address code, command word and data
field in hexadecimal system. (If there is a carry, please take the last two digits.)
Note: When the command word or data field changes, the calibration sum will change.
When you change the data field, please change the checksum accordingly.
2 Command format：
2.1 Read X, Y axis angle Send command： 77 04 00 04 08
Identifier
（1byte）
Data length
（1byte）
Address
code
（1byte）
Command
word
（1byte）
Data area
（0byte）
Checksum
（1byte）
0x77
0x04
0x04
Answer command：
Identifier
（1byte）
Data length
（1byte）
Address
code
（1byte）
Command
word
（1byte）
Data area
（12byte）
Checksum
（1byte）
0x77
0x10
0x84
3 group
SXXX.YY
Note：For example：X axis：+003.9967°，Y axis：-006.9028°，Z axis：-082.0138°
Z axis refers to the angle between the common perpendicular of the sensor installation
plane and the horizontal plane.

AS400
High sensitive low zero drift 3-axis accelerometer
Bewis Sensing Technology LLC www.bwsensing.com Tel：[phone]
X axis： +003.9967°，Y axis： -006.9028°，Z axis：-082.0138°
77 10 00 84 00 03 99 67 10 06 90 28 10 82 01 38
30
Prefix, fixed at 77
Data length, fixed at 10
Address code, default is 00
Command word, fixed at 84
Y axis angle ：
The format is the same as
the X axis
Z-axis or reserved position angle: the
format is the same as that of the X-axis
X axis angle：
The first bit of the first byte is the sign bit,
0 means positive angle, 1 means
negative angle. The second bit and the
second byte of the first byte are the
integer bits of the angle, which are the
compressed BCD codes.
The third byte and the fourth byte are
the decimal places of the angle, which
are compressed BCD codes.
The last byte is the sum of all the previous
data except the first number (0x77). If
there is a carry, the lower data is taken
2.2
Set communication rate Send command：77 05 00 0B 02 12
Answer command：
Identifier
（1byte）
Data length
（1byte）
Address code
（1byte）
Command word
（1byte）
Data area
（1byte）
Checksum
（1byte）
0x77
0x05
0x8B
0x00:
Success
0xFF: failed
Note: 0x00 means 2400; 0x01 means 4800; 0x02 means 9600; 0x03 means 19200; 0x04
means 115200; the default value is 0x02:9600.
Each time the communication baud rate is successfully changed, the response command
will be sent back at the original baud rate, and then the device communication baud
rate will be changed immediately. Note: If high frequency output is required, please set
the baud rate to 115200 and modify the baud rate. No need to send the save command,
it will take effect immediately.
Identifier
（1byte）
Data length
（1byte）
Address code
（1byte）
Command word
（1byte）
Data area
（1byte）
Checksum
（1byte）
0x77
0x05
0x0B
XX

AS400
High sensitive low zero drift 3-axis accelerometer
Bewis Sensing Technology LLC www.bwsensing.com Tel：[phone]
2.3
Set module address Send command：77 05 00 0F 01 15
Identifier
（1byte）
Data length
（1byte）
Address code
（1byte）
Command word
（1byte）
Data area
（1byte）
Checksum
（1byte）
0x77
0x05
Correct
0x0F
New address
Answer command：
Identifier
（1byte）
Data length
（1byte）
Address code
（1byte）
Command word
（1byte）
Data area
（1byte）
Checksum
（1byte）
0x77
0x05
New address
0x8F
0x00: Success
0xFF: Failed
Note: For example, the following command "77 05 00 0F 0A 1E" means to change the
address of the product from hexadecimal address 00 to 0A.
2.4 Query current address Send command： 77 04 00 1F 23
Identifier
（1byte）
Data length
（1byte）
Address code
（1byte）
Command word
（1byte）
Data area
（0byte）
Checksum
（1byte）
0x77
0x04
0x00
0x1F
0x23
Answer command：
Identifier
（1byte）
Data length
（1byte）
Address code
（1byte）
Command word
（1byte）
Data area
（1byte）
Checksum
（1byte）
0x77
0x05
New address
0x1F
New address
Note: The query address command fixes this command.
2.5 Set output frequency Send command：77 05 00 0C 00 11
Identifier
（1byte）
Data length
（1byte）
Address code
（1byte）
Command word
（1byte）
Data area
（1byte）
Checksum
（1byte）
0x77
0x05
0x0C
XX
Answer command：
Identifier
（1byte）
Data length
（1byte）
Address code
（1byte）
Command word
（1byte）
Data area
（1byte）
Checksum
（1byte）
0x77
0x05
0x8C
0x00: Success
0xFF: Failed
The sent data field XX is the automatic output frequency option: 00 means the response
mode,

Bewis Sensing Technology LLC www.bwsensing.com Tel：[phone]
AS400
High sensitive low zero drift 3-axis accelerometer
01 means 5Hz automatic output corresponding data type parameter
02 means 10Hz automatic output corresponding data type parameter
03 means 20Hz automatic output corresponding data type parameter
04 means 25Hz automatic output corresponding data type parameter
05 means 50Hz automatic output corresponding data type parameter
06 means 100HZ automatic output corresponding data typeparameter
Note: 1. When the automatic output frequency is set higher, the baud rate needs to be
set to a high baud rate. In some data types, 100HZ cannot be output due to the
limitation of the baud rate.
2. The automatic output data type parameter is determined according to the following
data type selection command, and the default is automatic output angle.
2.6
Query acceleration of gravity G value Send command： 77 04 00 54 58
Identifier
（1byte）
Data length
（1byte）
Address code
（1byte）
Command word
（1byte）
Data area
（0byte）
Checksum
（1byte）
0x77
0x04
0x54
-
Answer command：
Identifier
（1byte）
Data length
（1byte）
Address code
（1byte）
Command word
（1byte）
Data area
（12byte）
Checksum
（1byte）
0x77
0x10
0x54
3 group
SXYYYY
Note: S is the sign bit in the data field, X is the integer bit, and Y is the decimal bit.
If the return value is "77 10 00 54 10 01 51 00 00 04 47 00 11 05 00 00 27", it represents
the X axis: -0.0151g,
Y axis: 0.0447g, Z axis: -1.05g
2.7 Save settings Send command： 77 04 00 0A 0E
Identifier
（1byte）
Data length
（1byte）
Address code
（1byte）
Command word
（1byte）
Data area
（0byte）
Checksum
（1byte）
0x77
0x04
0x0A
Answer command：
Identifier
（1byte）
Data length
（1byte）
Address code
（1byte）
Command word
（1byte）
Data area
（1byte）
Checksum
（1byte）
0x77
0x04
0x8A
00: Set
successfully
FF: Set failed
Note: It is not necessary to save the settings to set the baud rate, and all other setting
items need to be sent to save the settings.

Bewis Sensing Technology LLC www.bwsensing.com Tel：[phone]
AS400
High sensitive low zero drift 3-axis accelerometer
Executive standard
Order information
AS400-1-485
RS 485
IP67 package/metal joint
AS400-1-232
RS232
IP67 package/metal joint
AS400-1-TTL
TTL
IP67 package/metal joint
● Enterprise Quality System Standard: ISO9001:2015 Standard (Certificate No.064-
21-Q-3290-RO-S)
● CE certification (certificate number: M.2019.103. U Y1151)
● ROHS (certificate Number: G 190930099)
● GB/T 191 SJ 20873-2003 General specification for inclinometer and level
● GBT 18459-2001 The calculation method of the main static performance index of
the sensor
● JJF 1059.1-2012 Evaluation and expression of measurement uncertainty
● GBT 14412-2005 Mechanical vibration and shock Mechanical installation of
accelerometer
● GJB 450A-2004 General requirements for equipment reliability
● GJB 909A Quality control of key parts and important parts
● GJB899 Reliability appraisal and acceptance test
● GJB150-3A High temperature test
● GJB150-4A Low temperature test
● GJB150-8A Rain test
● GJB150-12A Sand and dust experiment
● GJB150-16A Vibration test
● GJB150-18A Impact test
● GJB150-23A Tilt and rock test
● GB/T 17626-3A Radio frequency electromagnetic field radiation immunity test
● GB/T 17626-5A Surge (impact) immunity test
● GB/T 17626-8A Power frequency magnetic field immunity test
● GB/T 17626-11A Immunity to voltage dips, short-term interruptions and voltage
changes

AS400 Series
High sensitive low zero drift
3-axis accelerometer
Wuxi Bewis Sensing Technology LLC
Add：Building 30, NO. 58, Xiuxi Road, Binhu District,
Wuxi City, Jiangsu Province, China
Tel：[phone]
Mail：[e-mail]
Web：www.bwsensing.com