RS232/485 isolated conversion 4-20mA display control module:ISO DA (LED1)
Product Category: Data Acquisition AD Converter with LED Display
Input: RS232,RS485 Output: 4-20mA,0-10V etc
Power: -- Isolation Voltage: 3KVDC
Package: DIN35 Traffic Watch: times
Remarks: RS232/485 isolated conversion 4-20mA display control module
Keywords: RS232   RS485   isolated conversion   4-20mA   display control   
Product Description
RS232/485 isolated conversion 4-20mA display control module:ISO DA (LED1)

Features :
● Low cost, small size modular design for pairing with ISO 4021
● RS485 or RS232 digital isolation is converted into standard analog signal output
● Data output results are displayed in LED digital tube in two modes
● Analog signal output accuracy is better than 0.2%
● Programmable calibration module output accuracy
● Isolated voltage withstand 3000VDC between signal output and communication interface
● Wide power supply range: 8 ~ 50VDC
● High reliability, easy programming, easy to install and route
● User programmable module address, baud rate, etc.
● Can be set as a host to read ISO 4021 product data for remote acquisition
● Support Modbus RTU communication protocol
Typical application :
● Digital isolation is converted to standard analog output
● Intelligent building control, security engineering and other application systems
● RS232/RS485 bus industrial automation control system
● Industrial field control signal isolation and long-distance transmission
● Equipment operation debugging and control
● Remote transmission of sensor signals and signal restoration
● Industrial field actuator data given
● Development of power equipment, medical equipment, industrial control products
● Remote measurement, monitoring and control of PLC and DCS signals

ISO DA (LED1) series products can realize the isolation of host RS485 or RS232 interface signals into standard analog signals to control remote devices. The output analog signal value can be displayed in real time. The product can be applied to the RS232/RS485 bus industrial automation control system, which converts the computer serial communication signal into standard analog signal output such as 4-20mA (0-10V), which is used to control the industrial field execution equipment, instrumentation, PLC/DCS/ FCS/PCC, etc.
    Products include power isolation, signal isolation, linearization, D/A conversion, display and RS485 serial communication. Each serial port can connect up to 256 ISODA series modules. The communication mode adopts ASCII code communication protocol or Modbus RTU communication protocol. The instruction set is compatible with ADAM module. The baud rate can be set by code and can be linked with other manufacturers' control modules. On the RS485 bus, it is convenient for computer programming.
    ISO DA (LED1) is an intelligent monitoring and control system based on single-chip microcomputer. All user-set calibration values, address, baud rate, data format, checksum status and other configuration information are stored in non-volatile memory EEPROM. . The product is designed and manufactured according to industry standards. The signal output and communication interface can withstand 3000VDC isolation voltage, strong anti-interference ability and high reliability. Operating temperature range - 25 ° C ~ +70 ° C.
Block diagram:

Introduction to ISO DA (LED1) function:
ISO DA (LED1) signal isolation D / A conversion module, can be used to output a voltage or current signal, can also be used to output two current or voltage signals that can be common ground, and can display the output analog signal value in real time.
Analog signal output
12-bit output accuracy, all signal output ranges are fully calibrated before leaving the factory. When in use, users can also easily program their own calibration.
For the specific current or voltage output range, please refer to the product selection. When outputting two signals, the two output selections must be the same.
Communication interface: 1 standard RS485 communication interface or 1 standard RS232 communication interface. Indicate the communication method when ordering.
Communication protocol: Supports two protocols, the character protocol defined by the command set and the 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.
The communication address (0 to 255) and baud rate (300, 600, 1200, 2400, 4800, 9600, 19200, 38400 bps) can be set; the communication network can be up to 1200 meters long and connected by twisted pair shielded cable.
Communication interface with high anti-interference design, ±15KV ESD protection, communication response time less than 100mS.
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.
Typical application diagram:

Selection example 1, Model: ISO DA O1 -485 LED; Indicates 4-20mA signal output, input is RS485 communication, with LED display.
Selection example 2, Model: ISO DA O4 -232 LED; Indicates 0-5V signal output, input is RS232 communication, with LED display.
Selection example 3, Model: ISO DA O7 -232 LED; Indicates 0-±5V signal output, input is RS232 communication, with LED display.
Initialize the ISO DA module:
All ISO DA modules, if using an RS485 network, must be assigned a unique address code that takes a hexadecimal number between 00 and FF. However, all new ISO DA modules use the initial setup of a factory as follows:
Address code is 01
Baud rate 9600 bps
Prohibit checksum
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 each analog output module address. You can modify the address of the ISODA module by configuring the command after connecting the ISODA 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 default state, otherwise it cannot be modified.

How to get the module into the default state:
The ISO DA 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 default state. In this state, the module is configured as follows:
Address code is 00
Baud rate 9600 bps
Prohibit checksum
At this time, you can modify the baud rate, checksum status and other parameters of the ISODA module through the configuration command, and select the communication protocol by setting the communication protocol command of the module. When you are not sure about the specific configuration of a module, you can also configure the jumper to make the module enter the default 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.
Instructions for the use of LED digital tube display:
       The ISO DA-LED is a digital-to-analog output module with display. The analog voltage or current value of the output is displayed through a four-LED digital tube, which is convenient for the user to view the current output 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, 3-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 symbolic 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 3 bits of data are the decimal values ​​of the output 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 output value of one channel at a time (the channel number indicates which channel data is displayed). The two channel switching buttons below 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 LED displays the output value of each channel cyclically at a fixed time interval. To switch the display mode or turn off the display, just press the mode button (MODE).
Calibration module:
The product is calibrated at the factory and can be used directly without calibration.
You can also use the calibration function of the product to recalibrate the module during use. When calibrating, the module needs to use a high-precision multimeter to monitor the module's output.
To improve calibration accuracy, the following equipment is recommended for calibration:
1. A 5-bit or higher-precision voltage/current measuring instrument monitors the accuracy of the output signal
Calibration process:
1. Select the output channel to be calibrated and connect the corresponding voltage or current measuring instrument to the output range of the module.
2. Set the analog output module to calibrate the channel output zero signal, usually 0mA, 4mA or 0V. The first command of the command set is used to set the analog output, and the output signal displayed in the measuring instrument is adjusted to a zero value.
3. After the signal is stable, send an offset calibration to the analog output module. $AA1N command (N represents the channel code currently being calibrated, 0 or 1).
4. Set the channel output full-scale signal that the analog output module needs to calibrate. The analog output is set by the first command of the command set, and the output signal displayed in the measuring instrument is adjusted to the full value.
5. After the signal is stable, send a gain calibration to the analog output module. $AA0N command (N represents the channel code currently being calibrated, 0 or 1).
6. Calibration completed
Modbus RTU communication protocol:
The factory default protocol of the module is the character communication protocol. If you need to set the module to Modbus RTU communication protocol, please follow the steps below:
1. Short the CONFIG pin (pin 8) and the GND pin (pin 7).
2. Connect the power cable and communication interface cable correctly.
3. When the power is turned on, the module automatically enters the default state, the communication address is 00, and the baud rate is 9600.
4. Wait for 1 minute and the module is initialized.
5. Send the command $00P1(cr) to check the response. If it is !00 (cr), the setting is successful.
6. Turn off the power and disconnect the CONFIG pin from the GND pin.
7. The module has been successfully set to the Modbus RTU communication protocol mode.
The Modbus function codes supported by the module are 03 and 06. For the correspondence between Modbus data content and output, please refer to Table 4, which is the same as the data format of the character protocol is hexadecimal complement.
Host mode:
The ISO DA module can be set to the host mode by short-circuiting the HOST terminal to the GND terminal (ie, 11-pin and 12-pin short-circuit), connected to the communication interface of the ISO 4021 module, and the ISO 4021 module is set to Modbus communication mode. The two-channel input signals of ISO 4021 are output corresponding to the two output channels of the ISODA module. This mode is mainly used for digital remote transmission and restoration of analog signals, and is widely used in the fields of optical fiber transmission, GSM, CDMA wireless transmission, and Ethernet transmission.
Host mode setting method:
1. When the module is not powered, short the HOST terminal to the GND terminal (ie, the 11-pin and 12-pin are shorted).
2. Turn on the power, power on the module, and the module enters the host mode. It will continuously issue the read register data command according to the Modbus protocol.
3, Note that to enter the host mode, the CONFIG pin should not be shorted to the ground (GND pin), otherwise it will enter the default mode.
ISO 4021 (AD conversion) and ISO DA (DA conversion) online typical application diagram:
1. Signal remote transmission application example

2. Wiring diagram of RS485 communication mode of ISO DA and ISO 4021

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