Two 4-20mA signals converted to RS-485/232, MODBUS data acquisition module WJ20
Product features:
Two analog signal acquisition channels, isolated conversion RS-485/232 output
Using a 16 bit AD converter, the measurement accuracy is better than 0.1%
The precision of the calibration module can be programmed through the RS-485/232 interface
Isolation and withstand voltage of 3000VDC between signal inputs/outputs
Wide power supply range: 8~32VDC
High reliability, convenient programming, and easy application
Standard DIN35 rail installation for convenient centralized wiring
User programmable module address, baud rate, 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 collection
Intelligent building control, security engineering and other application systems
RS-232/485 bus industrial automation control system
Industrial site signal isolation and long-distance transmission
Equipment operation monitoring
Measurement of sensor signals
Acquisition and recording of industrial site data
Development of medical and industrial control products
4-20mA or 0-5V signal acquisition
Product Overview:
The WJ20 product implements signal acquisition between sensors and the host to detect analog signals. The WJ20 series products can be applied to the RS-232/485 bus
Industrial automation control system, 4-20mA/0-5V signal measurement, monitoring and control, as well as industrial site signal isolation and long-distance transmission, etc.
The products include power isolation, signal isolation, linearization, A/D conversion, and RS-485 serial communication. Each serial port can connect up to 255 WJ20 series
Column module, communication mode supports MODBUS RTU communication protocol, default address is 01, baud rate is 9600, data format: 10 bits, starting with 1 bit
Bit, 8-bit data bit, 1-bit stop bit, no checksum. It also supports ASCII communication protocol, and the baud rate can be set by the code, which can be controlled by other manufacturers
The modules are hung on the same RS-485 bus for easy computer programming
The WJ20 series products are intelligent monitoring and control systems based on microcontrollers, with all user set calibration values, addresses, baud rates, and data formats,
The configuration information such as checksum status is stored in the non-volatile memory EEPROM.
The WJ20 series products are designed and manufactured according to industrial standards, with isolation between signal inputs/outputs, capable of withstanding 3000VDC isolation voltage, and anti-interference ability
Strong and highly reliable. Working temperature range -45 ℃ to+85 ℃.
Function Introduction:
The WJ20 signal isolation acquisition module can be used to measure two voltage or current signals.
1. Analog signal input
16 bit acquisition accuracy, two analog signal inputs. All signal input ranges have been calibrated before the product leaves the factory. When in use, users can also be very
Convenient self programming calibration. Please refer to the product selection for the specific current or voltage input range.
2. Communication protocol
Communication interface: 1 standard RS-485 communication interface or 1 standard RS-232 communication interface, specified 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 the communication protocol,
Can achieve network communication with multiple brands of PLC, RTU or computer monitoring systems.
Data format: 10 digits. 1-bit start bit, 8-bit data bit, 1-bit stop bit.
The communication address (0-255) and baud rate (2400, 4800, 9600, 19200, 38400, 57600, 115200bps) can be set; Communication network
The longest distance of the network can reach 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.
3. Anti-interference
Checksum can be set as needed. There are transient suppression diodes inside the module, which can effectively suppress various surge pulses and protect the module
Word filtering can also effectively suppress power frequency interference from the power grid.
Product manual：https://www.wayjun.cn/d/
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