Eight-Channel 4-20mA Input Modbus RTU Communication Protocol Four-Channel Switch Input, Four-Channel Switch Output

Product features:
Eight 4-20mA input Modbus RTU communication protocol
Four channel switch input, four channel switch output
The precision of the calibration module can be programmed through the RS-485/232 interface
Isolation and voltage resistance between signal input/output 3000VDC
Wide power supply range: 8~32VDC
High reliability, easy programming, and easy application
Standard DIN35 rail installation, convenient for centralized wiring
 Users can program module addresses, baud rates, etc
 Supports Modbus RTU communication protocol and automatic recognition protocol
Low cost, small volume modular design
Typical applications:
Signal measurement, monitoring, and control
RS-485 remote I/O, data acquisition
Intelligent building control, security engineering and other application systems

Since: 2011
Specialty: The company's main products include analog acquisition modules, signal isolators/conversion modules, and signal transmitters
Capacity: Produce 10000 per month
Advanced Features:
Switching to TCP/network/remote IO module, Modbus RTU to TCP, RS232/485 to Ethernet, analog signal (current/voltage/thermistor/frequency/displacement/speed/pulse) isolation transmitter, mV differential signal amplifier, isolation amplifier, micro power DC-DC module power supply, etc

The WJ30 remote I/O module can be used to measure eight analog signals, four switch signals, and has four switch
outputs and one 0~4.8V voltage signal output.
1, Analog signal input
16 bit acquisition accuracy, 8 analog signal inputs.
All signal input ranges have been calibrated before the product
leaves the factory.
During use, users can also easily program and calibrate themselves.
Please refer to the
product selection for specific current or voltage input range.
2, Switching signal input and output, one channel of 0~4.8V voltage signal output
4-channel switch signal input, can be connected to dry and wet contacts, please refer to the wiring diagram for
details;
4-channel switch signal output with open collector output.
A 0~4.8V voltage signal output can be used for analog signal control.
3, Communication Protocol
Communication interface: 1 standard RS-485 communication interface or 1 standard RS-232 communication
interface, please specify when ordering and selecting.
Communication Protocol: Supports two protocols, the character protocol defined by the command set and the
MODBUS RTU communication protocol.
The module automatically recognizes communication
protocols and can achieve network communication with various brands of PLCs, RTUs, or computer
monitoring systems.
Data format: 10 digits.
1 start bit, 8 data bits, and 1 stop bit.
The communication address (0-255) and baud rate (2400, 4800, 9600, 19200, 38400, 57600, 115200bps) can be set;
The communication network can reach a maximum distance of 1200 meters and is connected through
twisted pair shielded cables.
High anti-interference design of communication interface, ± 15KV ESD protection, communication response time
less than 100mS.
4, anti-interference
Checksums can be set as needed.
There is a transient suppression diode inside the module, which can effectively
suppress various surge pulses, protect the module, and the internal digital filter can also effectively suppress power
frequency interference from the power grid.

The WJ30 product implements signal acquisition between sensors and hosts for detecting analog signals.
The
WJ30 series products can be applied to industrial automation control systems with RS-232/485 bus, 4-20mA/0-5V signal
measurement, monitoring and control, as well as industrial field signal isolation and long-term transmission, etc.
The product includes power isolation, signal isolation, linearization, A/D conversion, and RS-485 serial
communication.
Each serial port can connect up to 255 WJ30 series modules, and the communication method supports
MODBUS RTU communication protocol. The default address is 01, the baud rate is 9600, and the data format is 10 bits,
1 start bit, 8 data bits, 1 stop bit, and no checksum.
It also supports ASCII communication protocol, and the baud rate
can be set by code. It can be hung on the same RS-485 bus as other manufacturers' control modules, making it easy for
computer programming.

(Typical @+25 ℃, Vs is 24VDC)
Analog input: current input/voltage input
Accuracy: 0.1%
Temperature drift: ± 50 ppm/℃ (± 100 ppm/℃, maximum)
Input resistance: 100 Ω (4-20mA/0-20mA/0-10mA current input)
2K Ω (0-1mA current input)
Greater than 200K (5V/10V voltage input)
Bandwidth: -3 dB 10 Hz
AD conversion rate: 10 SPS (factory default value, users can modify the conversion rate by issuing
commands.)
The AD conversion rates of 2.5 SPS, 5 SPS, 10 SPS, 20 SPS, 40 SPS, 80 SPS, 160 SPS, 320 SPS, 500 SPS, and 1000
SPS can be set through the 40204 register.
(Channel conversion rate=AD conversion rate/number of
open channels)
Note: Please recalibrate the module after modifying the conversion rate, otherwise the measured data may have
deviations. You can also specify the conversion rate when placing an order, and we will
recalibrate the product according to the conversion rate you require when it leaves the factory.
Common mode rejection (CMR): 120 dB (1k Ω Source Imbalance @ 50/60 Hz)
Normal mode suppression (NMR): 60 dB (1k Ω Source Imbalance @ 50/60 Hz)
Input protection: overvoltage protection, overcurrent protection
Switch input: 4-channel (DI0~DI3).
Low level: Input<1V
High level: Input 4~30V
Input resistance: 3K Ω
Switching output: open collector output, voltage 0~30V, maximum load current 30mA, 4-channel (DO0~DO3).
Analog output: voltage 0~4.8V, output load greater than 2K ohms.
Communication: RS-485 or RS-232 standard character protocol and MODBUS RTU communication protocol
Baud rates (2400, 4800, 9600, 19200, 38400, 57600, 115200bps) can be selected by software
The address (0-255) can be selected by software
Communication response time: 100 ms maximum
Working power supply:+8~32VDC wide power supply range, with internal anti reverse and overvoltage protection
circuits
Power consumption: less than 2W
Working temperature: -45~+80 ℃
Working humidity: 10~90% (no condensation)
Storage temperature: -45~+80 ℃
Storage humidity: 10~95% (no condensation)
Isolation and voltage resistance: The analog signal and switch signal are isolated at 3000V, and the switch signal and
power supply are grounded together.
Dimensions: 120mm x 70mm x 43mm

 1 WJ30module appearance diagram
 The WJ30 product implements signal acquisition between sensors and hosts for detecting analog signals. The
 WJ30 series products can be applied to industrial automation control systems with RS-232/485 bus, 4-20mA/0-5V signal
 measurement, monitoring and control, as well as industrial field signal isolation and long-term transmission, etc.
 The product includes power isolation, signal isolation, linearization, A/D conversion, and RS-485 serial
 communication. Each serial port can connect up to 255 WJ30 series modules, and the communication method supports
 MODBUSRTUcommunication protocol. The default address is 01, the baud rate is 9600, and the data format is 10 bits,
 1 start bit, 8 data bits, 1 stop bit, and no checksum. It also supports ASCII communication protocol, and the baud rate
 can be set by code. It can be hung on the same RS-485 bus as other manufacturers' control modules, making it easy for
 computer programming.

Q: How to contact you?
A: Please contact us via email or online customer service