2-channel analog AD acquisition display control isolation transmission digital meter:ISO 4021 (LED1)
Product Category: Data Acquisition AD Converter with LED Display
Input: 4-20mA,0-10V etc Output: RS232,RS485
Power: -- Isolation Voltage: 3KVDC
Package: DIN35 Traffic Watch: times
Remarks: 2-channel analog AD acquisition display control isolation transmission digital meter
Product Description
2-channel analog AD acquisition display control isolation transmission digital meter:ISO 4021 (LED1)

● Low cost, small size modular design for easy desktop and rail mounting
● The acquired analog quantity is converted into RS485/232 to support Modbus RTU communication protocol.
● Data acquisition intelligent real-time monitoring and display in two modes LED digital tube
● Measurement accuracy is better than 0.05%, programmable calibration module accuracy
● Power supply wide voltage supply range: 8 — 50VDC
● High reliability, easy programming, easy to install and route
● User programmable setting target module address, baud rate, etc.
● Can be directly monitored according to the results of field data collection and display
● The isolation voltage between the signal input and output is 3000VDC
● Industrial temperature range: - 40 ~ + 85 °C
Typical application :
● Industrial equipment intelligent operation and maintenance, monitoring and remote control
● Intelligent building, smart home, security engineering system monitoring
● Intelligent monitoring of RS232/485 fieldbus automation system
● Sensor signal isolation and intelligent long-distance transmission
● Analog signal A/D conversion, adjustment and remote intelligent transmission
● Acquisition, control and recording of multi-channel operational data at industrial sites
● Power automation equipment, medical instrument intelligent product development
● Industrial computer, PLC/DCS analog signal acquisition isolation and transmission
● Petrochemical, environmental monitoring, intelligent control of traffic operation system

Sunyuan ISO 4021 series intelligent data acquisition display control module can realize signal safety isolation and high-precision data acquisition, isolation display and monitoring between sensor and host. This product integrates isolation, display, alarm control and transmission. It is widely used in RS-232/485 bus industrial automation control system, 4-20mA / 0-10V signal measurement, monitoring and intelligent control, small signal measurement and Remote monitoring of industrial field signal isolation and long-distance transmission. Through the configuration of the software, a variety of sensor types can be connected, including current output type and voltage output type.
  The ISO 4021 series intelligent data acquisition display control products include power isolation, signal isolation, linearization, A/D conversion, digital tube display and RS-485 serial communication. Each serial port can connect up to 256 ISO AD series modules. It adopts the standard common communication method of ASCII character communication protocol or MODBUS RTU communication protocol. Its instruction set is compatible with ADAM module. The baud rate can be set by the user and can be compared with other manufacturers. The control module is hung on the same RS-485 bus for easy host programming.
  ISO 4021 series intelligent data acquisition display control products are intelligent monitoring and control systems based on single-chip microcomputer. All user-set calibration values, addresses, baud rates, data formats, checksum status and other configuration information are stored in non-volatile. In the memory EEPROM. The analog signal is isolated and amplified by AD conversion, and has a signal display function. The products are intelligently designed and have many functions that are not available in traditional products. The analog signal can be isolated and transmitted only by a single power supply, and displayed in decimal digital quantities according to the set range. The traditional embedded analog display meter is adjusted by a potentiometer, and the adjustment parameters are single, inflexible, and greatly affected by temperature. Compared with the traditional analog display table, the embedded intelligent digital display table is controlled by the central processing unit CPU, and can realize various parameters such as zero point, full scale, data format and communication protocol through configuration software control. Strong flexibility and practicality. The digital display adopts an LED display panel and has reverse and overcurrent protection functions. The products are widely used in industrial control, petrochemical, environmental protection, smart home, mining and other industries to monitor and control temperature physical quantity control points.
Block diagram:

Function introduction:
The ISO 4021 (LED1) series of intelligent signal isolation acquisition modules can be used to measure one voltage or current signal, and can also be used to measure two current or voltage signals that can be common and do not interfere with each other. The data acquisition results are displayed in two modes through the LED digital tube.
24-bit acquisition accuracy, analog signal input. All signal input ranges have been calibrated before leaving the factory. When in use, users can also easily program their own calibration. For the specific current or voltage input range, please refer to the product selection. When measuring two signals, the two input selections must be the same.
1, the communication protocol
Communication interface: 1 standard RS-485 communication interface and 1 standard RS-232 communication interface.
Communication Protocol: Supports two protocols, ASCII character protocol and MODBUS RTU communication protocol. The communication protocol can be programmed to enable network communication with various brands of PLC, RTU or computer monitoring systems.
Data format: 10 digits. 1 bit start bit, 8 data bits, 1 stop bit.
Communication address: (00H-FFH) and baud rate (300, 600, 1200, 2400, 4800, 9600, 19200, 38400bps) can be set; communication network can be up to 1200 meters long, connected by twisted pair shielded cable . Communication interface with high anti-interference design, ±15KV ESD protection, communication response time less than 100mS.
2, anti-interference
The checksum can be set as needed. The module has a transient suppression diode inside, which can effectively suppress various surge pulses, protect the module, internal digital filtering, and also can effectively suppress the power frequency interference from the power grid.
Remarks: ISO 4021 (LED1) series products support RS23 and RS485 communication interface output at the same time. Users can select the corresponding communication interface according to the use environment, but only one interface can work online at the same time, otherwise it will cause interference.
Product selection example
Example 1, two-channel signal input: 4-20mA; auxiliary power supply: 24VDC; output: RS23 and RS485 communication; LED display.
             Product model: ISO 4021-A4-LED1
Example 2, two-channel signal input: 0-±20mA; auxiliary power supply: 12VDC; output: RS23 and RS485 communication; LED display.
             Product model: ISO 4021-A7-LED1
Example 3, two-channel signal input: 0-5V; auxiliary power supply: 12VDC; output: RS23 and RS485 communication; LED display.
             Product model: ISO 4021-U1-LED1
Typical application wiring diagram:

ISO 4021 (AD conversion) and ISO DA (DA conversion) online typical application diagram:

Signal remote transmission application example:
1, ISO 4021 and ISO DA RS485 communication mode application wiring diagram

2, ISO DA and ISO 4021 RS232 communication mode application wiring diagram 

Initialize ISO 4021 (LED1)
When accessing an RS-232/RS-485 network, a unique address code must be assigned to the ISO 4021 (LED1) module. The address code is a hexadecimal number between 0x00 and 0xFF. All new ISO 4021 (LED1) modules use the same factory initial setup as follows:
The address code is 01H
Baud rate 9600 bps
Prohibit checksum
ASCII character communication protocol
Since the address codes of the new modules are the same, their addresses will contradict other modules, so when you build the system, you must reconfigure the address of each module. You can modify the address of the ISO 4021 (LED1) module by configuring the command after connecting the ISO 4021 (LED1) module power cable and the RS485 communication cable. The baud rate, checksum status, and communication protocol also need to be adjusted according to user requirements. Before modifying the baud rate, checksum status, and communication protocol, the module must first enter the configuration state, otherwise it cannot be modified.
How to get the module into the configuration state:
The ISO 4021 (LED1) module has a special pin labeled CONFIG. Short-circuit the CONFIG pin to the ground (GND pin), then turn on the power, and the module enters the configuration state. In this state, the module is configured as follows:
Address code is 00H
Baud rate 9600 bps
Prohibit checksum
ASCII character communication protocol
At this time, you can modify the baud rate, checksum status and other parameters of the ISO 4021 (LED1) module through configuration commands, or you can select the communication protocol by setting the module's communication protocol command. When you are not sure about the specific configuration of a module, you can also configure the jumper to make the module enter the configuration state and then reconfigure the module. If the user needs to set the module to the MODBUS RTU communication protocol, please see the MODBUS communication protocol chapter for instructions.
ISO 4021 (LED1) module calibration:
Calibration must be done under the ASCII character communication protocol. Calibration is not supported under the Modbus protocol.
The product is calibrated at the factory and can be used directly without calibration. The user can also recalibrate the module during use. When calibrating, the module needs to input the appropriate signal, and different input ranges require different input signals.
To improve calibration accuracy, the following equipment is recommended for calibration:
1. A DC voltage/current signal source with stable output and low noise
2. A 5-bit or higher-precision voltage/current measuring instrument monitors the accuracy of the input signal
Calibration process:
1. Select the input channel to be calibrated and connect the corresponding input signal according to the input range of the module.
2. The ISO 4021 (LED1) module zero is calibrated at input 0, and the full scale is calibrated at 120% of the input full scale.
3. For example, when inputting 4-20mA, the calibration zero input 0mA, the calibration full input 24mA. (0-5V input, calibration zero input 0V, calibration full input 6V).
4. Input the zero signal to the channel that the analog input module needs to calibrate, usually 0mA or 0V.
5. After the signal is stable, send an offset calibration to the analog input module. $AA1N command (N represents the channel code currently being calibrated, 0 or 1).
6. Input the current or voltage signal of 120% of the full scale to the channel that the analog input module needs to calibrate.
7. After the signal is stable, send a gain calibration to the analog input module. $AA0N command (N represents the channel code currently being calibrated, 0 or 1).
8, calibration is complete
Instructions for the use of LED digital tube display:
       ISO 4021 (LED1) is an analog data acquisition module with display. The collected analog voltage or current value is displayed by a four-digit LED digital tube, which is convenient for the user to view the current collected value. If no display is required, the user can turn off the display with the MODE button. When the display is turned on, two display modes, single channel display and multi-channel cycle display, are used.
The display data format is: channel number, symbol mark, three-bit data bit; data bits are divided into integer and fractional parts, separated by a decimal point. The first digit from the left is the channel number (1-2). The channel number is followed by a decimal point for the symbol mark. The decimal light indicates that the current data is positive. If the decimal point is off, it means the current data is negative. The last three digits are the decimal values ​​of the acquired data.
Display mode:
       The mode is switched by the mode switch button (MODE button). When the mode button is pressed, the LED briefly displays C1 to indicate that the current mode is the single channel display mode, and the short display C2 indicates that the current mode is the multi-channel cyclic display mode.
C1: Single channel display. In this mode, the LED only displays the acquisition value of one channel at a time (the channel number indicates which channel data is displayed). The two channel switching buttons above the mode button switch the display channel. After the left button is pressed, , the channel number is incremented by one; when the right button is pressed, the channel number is decremented by one.
C2: Multi-channel cyclic display. In this mode, the LEDs display the collected values ​​of each channel at a fixed time interval. To switch the display mode or turn off the display, just press the mode button (MODE).
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