Isolated tamper-proof smart sensor modules with 2-4 inputs per channel: ISO AD02/ISO AD04 series

　　 SunYuan ISO AD series fully isolated analog to digital products (Adam module) can realize safe signal isolation and high-precision data acquisition, isolated conversion, monitoring and transmission between multiple sensors and host computer. The products are widely used in RS-232/485 bus industrial automation control system, 4-20mA / 0-10V signal measurement, monitoring and control, small signal measurement as well as industrial field signal isolation and long line transmission and other remote monitoring occasions. Through the software configuration, it can be accessed to a variety of sensor types, including current output type, voltage output type and so on.

       ISO AD series products are designed and manufactured in accordance with industrial standards, and the signals between each input channel are completely isolated (no common ground). Each independent channel signal input / output is also isolated, isolation voltage 3KVDC, anti-interference ability, high reliability. Operating temperature range - 45℃～+80℃.

      The product includes analog signal isolation amplifier, power isolation, signal isolation, linearization, A/D conversion and RS-485 serial communication modules. Each serial port can be connected to a maximum of 256 ISO AD series modules, the communication method uses ASCII code character communication protocol or MODBUS RTU communication protocol, its instruction set is compatible with the ADAM module, the baud rate can be set by the user, and it can be hooked up to the same RS-485 bus with other manufacturers' control modules, which is convenient for the host computer to program.

       ISO AD series AD products are intelligent monitoring and control systems based on microcontrollers. All user-set configuration 

ISO AD02/4A Function Introduction

 ISO AD02/4A channel-isolated AD data acquisition module, can be used to measure the input circuit is completely independent of the two (or four) current or voltage signals, the data acquisition input channel isolation will not produce ground loop current and mutual interference, to meet the needs of industrial field process control and high reliability.

　　　 Analog signal input, 24-bit acquisition accuracy, all signal input ranges have been fully calibrated before the product leaves the factory. In use, the user can also easily program their own calibration. Specific current or voltage input range, please see the product selection, measurement of two signals must be the same for both input selection.

1、 Communication protocol

Communication interface: 1 channel standard RS-485 communication interface and 1 channel standard RS-232 communication interface.

Communication protocol: Support two protocols, ASCII character protocol and MODBUS RTU communication protocol. It can be programmed to use that kind of communication protocol, which can realize network communication with many brands of PLC, RTU or computer monitoring system.

Data format: 10 bits, 1 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; the longest distance of the communication network can be up to 1200 meters, connected by twisted shielded cable. Communication interface high anti-interference design, ±15KV ESD protection, communication response time less than 100mS.

2、 Anti-interference

The calibration sum can be set as required. There are transient suppression diodes inside the module, which can effectively suppress various surge pulses and protect the module, and the internal digital filtering can also well suppress the industrial frequency interference from the power grid.

Example 1: Model: ISO AD 02A-A4 for 2-channel, 4-20mA signal input.

Example 2: Model: ISO AD 04A-A7 for 4-channel, 0-±20mA signal input.

Selection example 3: Model No. ISO AD 02A-U1 represents a two-channel, channel-isolated, 0-5V signal input.

Initializing the ISO AD02/4A Module

　　 When connecting to an RS-232/RS-485 network, the ISO AD02/4A module must be assigned a unique address code, which is a hexadecimal number that takes values between 0x00 and 0xFF. All new ISO AD02/4A modules use the same factory initial settings as shown below: 

Address code 01H

Baud rate 9600 bps 

Checksum disabled 

ASCII character communication protocol

Since the new modules all have the same address code, their addresses will contradict those of the other modules, so you will have to reconfigure each module's address when you set up your system. You can change the address of the ISO AD02/4A module by configuration commands after connecting the ISO AD02/4A module power cable and RS485 communication cable. The baud rate, checksum status, and communication protocol also need to be adjusted according to the user's requirements. Before modifying the baud rate, checksum status and communication protocol, the module must be put into the configuration state first, otherwise it cannot be modified.

Methods of getting the module into a configuration state

　　ISO AD02/4A modules have a special pin labeled CONFIG. The module enters the configuration state when the CONFIG pin is shorted to ground (GND pin) and then powered on. In this state, the module is configured as follows:

Address code 00H

Baud rate 9600 bps

Prohibit checksum

ASCII character communication protocol 

At this point, the baud rate, parity and status parameters of the ISO AD02/4A module can be modified by configuration commands, and the communication protocol can also be selected by the Set Module Communication Protocol command. When you are not sure about the specific configuration of a module, you can also install a configuration jumper to make the module enter the configuration state and then reconfigure the module. If the user needs to set the module to MODBUS RTU communication protocol, please see the relevant instructions in the MODBUS communication protocol chapter.