JXCT 485 User manual

Manual for 485
total solar
radiation sensor
JXBS-3001-ZFS
Ver1.1

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Chapter 1 Product Introduction
1.1 Product overview
JXBS-3001-ZFS Total Solar Radiation Sensor
(Transmitter) is a sensor that can measure total solar
radiation with a spectral range of 0.3-3μm. If the
sensing surface is facing downwards, it can measure
reflected radiation, and a light-shielding ring can
also measure scattering radiation.
The core component of the radiation sensor is a
high-precision photosensitive element, which has good
stability and high accuracy. At the same time, a
quartz glass cover made of precision optical cold
processing is installed outside the sensing element to
effectively prevent environmental factors from
affecting its performance. The product can be widely
used in meteorology, energy, agriculture, construction
and other fields.
1.1 main parameters
parameter name Parameter content
DC power supply (default）9-24V DC
Power consumption ≤0.15W（@12V DC , 25℃）
Measuring range 0-1500W/m2
Spectral range 0.3-3um
Resolution 1 W/m2

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output signal RS485 output (Mondbus protocol)
working environment -45-85℃0-100%RH
responding speed ≤5s
1.1 System framework diagram
This sensor can be connected and used alone, first use 12V DC power
supply Power supply, the device can be directly connected to a PLC
with a 485 interface, through
The 485 interface chip is connected to the microcontroller. The
single-chip microcomputer and PLC can be programmed through the
modbus protocol specified later to cooperate with the sensor. use
simultaneously
USB to 485 can be connected to the computer, use the sensor
configuration tool provided by our company to configure and test.

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This product can also be used by combining multiple sensors on a 485
bus,
Please observe "485 Bus Field Wiring Rules" when performing 485 bus
combination
(See Appendix). In theory, one bus can connect more than 16 485
sensors
If you need to connect more 485 sensors, you can use a 485 repeater
to expand
Charge more 485 devices, connect the other end to the PLC with 485
interface, connect the MCU through the 485 interface chip, or use
USB to 485 to connect to the computer, and use the sensor
configuration tool provided by our company to configure and test.

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Chapter 2 Hardware Connection
2.1 Inspection before equipment installation
Please check the equipment list before installing the equipment:
name
Quantity
Total solar
radiation
sensor
1set
12V waterproof
power supply
1set
（Optional）
USB to 485 device
1set
（Optional）
Warranty
card/certificate
1 serving
Wide voltage power input is 12-24V. Note when wiring the 485
signal line
The two wires A/B cannot be reversed, and the addresses of
multiple set devices on the bus cannot be conflicted

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Thread color Description
power supply brown Power is positive
（12-24V DC）
black Power negative
Communication Yellow (gray) color 485-A
blue 485-B
Note: Please be careful not to connect the wrong wiring sequence,
the wrong wiring will cause the equipment to burn.
The factory default provides 0.6m long wire, customers can
extend the wire as needed or wire in order.
Note that there is no yellow line in the line sequence that may
be provided in some factory batches. At this time, the gray line is
equivalent to replacing the yellow line.

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2.3 Product size and installation instructions
(1) Ensure that the mounting bracket is parallel to
the ground;
(2) Use M6 screws and nuts to fix the sensor on the
cross arm through the 2 mounting holes on the sensor;
(3) Please avoid disassembling the sensor during
installation.
(4) Please unscrew the protective cover above the
sensor when using it. In order to protect the sensor,
tighten the protective cover above the sensor when
it is not in use or during transportation.
Chapter 3 Configuration Software
Installation and Use

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Our company provides supporting "sensor monitoring
software", which can easily use the computer to read
the sensor parameters, and flexibly modify the device
ID and address of the sensor.
3.1 Connect the sensor to the computer
After the sensor is correctly connected to the computer via USB
to 485 and supplied with power, you can see the correct COM port
("My Computer—Properties"
—Device Manager — Port” to view the COM port).

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As shown in the figure above, your serial port
number is COM10 at this time, please remember this
serial port, you need to fill in this serial port
number in the sensor monitoring software.
If the COM port is not found in the device
manager, it means that you have not inserted the USB
to 485 or the driver has not been installed correctly,
please contact the technical staff for help.
3.1 Use of sensor monitoring software
The configuration interface is as shown in the figure. First, obtain
the serial port number and select the correct serial port according
to the method in chapter 3.1, and then click to automatically obtain
the current baud rate and address to automatically detect all
devices and baud rates on the current 485 bus . please
Note that you need to ensure that there is only one sensor on the
485 bus when using the software for automatic acquisition.

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Then click to connect the device to get the sensor data
information in real time. If your device is a gas
concentration sensor, please specify the sensor type
Select "gas concentration sensor", formaldehyde sensor
select "formaldehyde transmitter", analog transmitter
select "analog transmitter module", atmospheric pressure
sensor select
"Atmospheric pressure sensor", illuminance sensor selects
"Illuminance 20W", oxygen sensor selects "Oxygen
transmitter", and other sensors select the default
"No other sensors".
3.1 Modify the baud rate and device ID
When the device is disconnected, click the device
baud rate and set address in the communication
settings to complete the related settings. Please note
that after setting, please restart the device, and

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then "automatically obtain the current baud rate and
address" to find the address And the baud rate has
been changed to the address and baud rate you need.
If you need to use modbus command to modify baud
rate and address, you can refer to the appendix "How
to use modbus command to modify baud rate and address"

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Chapter 4 Communication Protocol
4.1 Basic communication parameters
parameter content
coding 8-bit binary
Data bit 8-bit
Parity bit no
Stop bit 1-bit
Wrong calibration CRC lengthy cyclic code
Baud rate 2400bps/4800bps/9600bps can be set ,the factory
default is 9600bps
4.1 Data frame format definition
Adopt Modbus-RTU communication protocol, the format is as follows:
Initial structure ≥ 4 bytes of time
Address code = 1 byte Function code = 1 byte Data area = N bytes
Error check = 16-bit CRC code end structure ≥ 4 bytes time
Address code: It is the function indicator of the transmitter, this
transmitter only uses the function code
0x03 (read register data).
Data area: The data area is the specific address, which is unique in
the communication network
(The factory default is 0x01).
Function code: command communication data sent by the host, pay
attention to the 16bits data high byte first!
CRC code: two-byte check code.

Interrogation
frame
Address code
Features
Register
start
address
Regist
er
length
Check
code low
High bit
of proof
code
1 byte 1 byte 2 byte 2 byte 1 byte 1
Reply frame
address Features
Code
Code
Valid
byte
number
First
number
According
to the
distrit
Second
number
According to
the district
1 byte 1 byte 2 byte 2 byte 2 byte
4.2 Register address
4.1 通
讯
协
议
4.2
4.3 Examples and explanations
Read the total solar radiation
value of the device address
0x01Interrogation frame
Register
PLC groupv content
content 操作
address
0000H
40001
Total solar radiation
(1W/m2)
Read
only
0100H
40101
Device address (0-252)
Read
and
write
0101H
40102
Baud rate (2400/4800/9600)
Read
and
write
addre
ss
code
funct
ion
code
initial
address
Data
length
Check
code low
bit
Check code
high

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Response frame (for example, the total solar radiation
value is 71 W/m2)
addr
ess
code
functio
n code
Returns the
number of
valid bytes
Data
area
Check
code
low
bit
Check
code
high
0x01
0x03
0x02
0x00
0x47
0xD8
0x15
9
0x01
0x03
0x00
0x00
0x00
0x01
0x84
0x0A

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Explanation of total solar radiation calculation:
0047H(Hexadecimal)=71=>Total solar radiation=71 W/m2
Chapter 5 Appendix
5.1 Product additional instructions
"485 Device Field Wiring Manual": Describes the
wiring guidelines for 485 products. Please check and
follow the guidelines, otherwise it may cause
unstable communication.
"Revision of temperature and humidity deviation
of 485 sensor": Describes how to confirm and adjust
temperature and humidity deviation when you feel
that there is a deviation in temperature and
humidity.
"Using modbus to modify device baud rate and
address": describes if you do not use software, use
modbus commands to modify the baud rate and slave
station number.
"How to Use Single Chip Computer for 485
Communication": describes how to use 51
The one-chip computer reads the sensor
information, and carries on the science
popularization to some basic knowledge.
"How to calculate CRC16": Describes the modbus
RTU protocol

How to calculate CRC16 and an example C language
program.
"How to use USB to 485 auxiliary debugging when
reading sensor communication has problems":
describes how to use auxiliary tools to solve and
troubleshoot when there are communication problems.
"How to use and set the product alarm function":
Describes the Optional product alarm function, how
to use it, how to wire and other issues.
5.1 Warranty and after-sales
The warranty clauses follow the sensor after-sales clauses of Weihai
Jingxun Changtong Electronic Technology Co., Ltd., two years for the
sensor host circuit part, one year for gas-sensitive probes, and
three months for accessories (housing/plugs/cables, etc.)

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