BW SENSING AS400S Series User manual

V3.0
Technical Manual
AS400SSeries
High-sensitive low zero drift
3-Axis accelerometer

Bewis Sensing Technology LLC www.bwsensing.com Tel：[phone]
AS400S
High sensitive low zero drift 3-axis accelerometer
Feature
Application
AS400S 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. AS400S 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
Introduction
●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]
AS400S
High sensitive low zero drift 3-axis accelerometer
Parameter Condition Min Typ Max Unit
P
ower supply 936 V
W
orking current No load 20 30 40 mA
O
perating temperature -40 +85 ℃
S
torage temperature -55 +100 ℃
Technical Parameters Condition Index parameter Unit
Measuring range Tria-xial ±3.6 g
Resolution 0.1mg
Zero bias ±3.6g 0.5mg
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℃2mg
Zero drift 0.01 %
Resonance frequency 1K Hz
Operating temperature -40 - 85 ℃
Protection level IP67
Power ≤0.5 W
Electrical index
Product Feature
Performance index

Bewis Sensing Technology LLC www.bwsensing.com Tel：[phone]
AS400S
High sensitive low zero drift 3-axis accelerometer
Product size：L55*W37*H24（mm）
Connector Metal joint （cable 1.5m)
Protection level IP67
Shell material Magnesium alloy oxidation
Installation Three M4 screws
Mechanical Index
Package size
PCBA size

Bewis Sensing Technology LLC www.bwsensing.com Tel：[phone]
AS400S
High sensitive low zero drift 3-axis accelerometer
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 Figure C. The correct installation method is shown in Figure B and Figure D.
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.
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.
the measured surface
uneven surface
generates the
angle
the measured surface
C D
AB
the measured surface the measured surface
uneven surface
generates the
angle

Bewis Sensing Technology LLC www.bwsensing.com Tel：[phone]
AS400S
High sensitive low zero drift 3-axis accelerometer
1
5
Accelerometer
4
DC9-36V
GREEN RXD
3
BLACK GND
1
6
2
7
3
4
8
GND
RS 232 Wiring diagram
RS 485 Wiring diagram
RED VCC
Yellow TXD
接线定义
Wiring color
function
RED BLUE BLACK GREEN YELLOW
12345
VCC
DC 9-36VNC GND RXD
（B、D-）
TXD
（A、D+）
Electrical connections
RED VCC
YELLOW D+
DC9-36
485+
GREEN D-
485-
Signal
acquisition
terminal
BLACK GND
GND

Bewis Sensing Technology LLC www.bwsensing.com Tel：[phone]
AS400S
High sensitive low zero drift 3-axis accelerometer
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 AS400S 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：
①Connect the serial port hardware of the accelerometer correctly and connect the power
supply.
②Select the computer serial port and baud rate and click to connect to the serial port.
③Click Start and the current data will be displayed on the screen.
Debugging software

Bewis Sensing Technology LLC www.bwsensing.com Tel：[phone]
AS400S
High sensitive low zero drift 3-axis accelerometer
1 Data frame format：1（8 data bits，1 stop bit，No parity check，default baud
rate 9600）
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
Answer command：
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.
Identifier
（1byte）
Data length
（1byte）
Address code
（1byte）
Command
word
（1byte）
Data area
（Xbyte）
Checksum
（1byte）
0x77H
Identifier
（1byte）
D
ata length
（1byte）
Address
code
（1byte）
Command
word
（1byte）
Data area
（0byte）
Checksum
（1byte）
0x77 0x04 0x04
Identifier
（1byte）
D
ata length
（1byte）
Address
code
（1byte）
Command
word
（1byte）
Data area
（12byte）
Checksum
（1byte）
0x77 0x10 0x84 3 group
SXXX.YY
Protocol

Bewis Sensing Technology LLC www.bwsensing.com Tel：[phone]
AS400S
High sensitive low zero drift 3-axis accelerometer
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
2.2 Set communication rate Send command：77 05 00 0B 02 12
Answer command：
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
Identifier
（1byte）
Data length
（1byte）
Address code
（1byte）
Command
word
（1byte）
Data area
（1byte）
Checksum
（1byte）
0x77 0x05 0x8B
0x00:
Success
0xFF: failed
Prefix, fixed at 77
Data length, fixed at 10
Address code, default is 00
Command word, fixed at 84
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.
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
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

Bewis Sensing Technology LLC www.bwsensing.com Tel：[phone]
AS400S
High sensitive low zero drift 3-axis accelerometer
2.3 Set module address
Send command：77 05 00 0F 01 15
Answer command：
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
Answer command：
Note: The query address command fixes this command.
2.5 Set output frequency Send command：77 05 00 0C 00 11
Answer command：
The sent data field XX is the automatic output frequency option: 00 means the response
mode,
Identifier
（1byte）
Data length
（1byte）
A
ddress code
（1byte）
Command word
（1byte）
Data area
（1byte）
Checksum
（1byte）
0x77
0x05
Correct
0x0F
New address
Identifier
（1byte）Data length （1byte）Address code （1byte）
C
ommand word
（1byte）Data area （1byte）Checksum （1byte）
0x77 0x05 New address 0x8F 0x00: Success
0xFF: Failed
Identifier
（1byte）Data length （1byte）Address code
（1byte）
C
ommand word
（1byte）Data area （0byte）Checksum （1byte）
0x77 0x04 0x00 0x1F 0x23
Identifier
（1byte）Data length （1byte）Address code （1byte）
Command word
（1byte）
Data area
（1byte）Checksum （1byte）
0x77 0x05 New address 0x1F New address
Identifier
（1byte）
D
ata length
（1byte）
Address code
（1byte）
Command word
（1byte）
Data area
（1byte）
Checksum
（1byte）
0x77 0x05 0x0C
XX
Identifier
（1byte）Data length （1byte）Address code （1byte）
Command word
（1byte）
Data area
（1byte）Checksum （1byte）
0x77 0x05 0x8C
0x00: Success
0xFF: Failed

Bewis Sensing Technology LLC www.bwsensing.com Tel：[phone]
AS400S
High sensitive low zero drift 3-axis accelerometer
2.6
Query acceleration of gravity G value Send
co mmand：77 04 00 54 58
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 type parameter
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.
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）
C
ommand 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）
D
ata length
（1byte）
Address code
（1byte）
C
ommand word
（1byte）
Data area
（0byte）
Checksum
（1byte）
0x77 0x04 0x0A
Answer command：
Identifier
（1byte）
Data length
（1byte）
Address code
（1byte）
C
ommand 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]
AS400S
High sensitive low zero drift 3-axis accelerometer
AS400S-1-485 RS 485 IP67 package/metal joint
AS400S-1-232 RS232 IP67 package/metal joint
AS400S-1-TTL TTL IP67 package/metal joint
Executive standard
Order information
●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

Wuxi Bewis Sensing Technology LLC
Add：Building 30, NO. 58, Xiuxi Road, Binhu District,
Wuxi City, Jiangsu Province, China
Tel：[phone]
Mail：[email protected]
Web：www.bwsensing.com
AS400S Series
High-sensitive low zero drift
3-axis accelerometer