1、Power supply selection: Please choose a DC stabilized power supply, the power indicator will be on when the product is normally powered, and the power supply voltage must be within the rated value range.
         This is a necessary prerequisite for us to proceed to the next step. If the power indicator is off, the product will not work. Please check whether the power supply is a DC stabilized power supply or whether the supply voltage value is within the rated value. In many cases, the power supply cord is connected reversely (the product itself has reverse connection protection).
Case: The customer reported that the product did not respond. After checking the picture, it was found that the power indicator of the product was not on, and the product returned to normal after being correctly powered on.

2、The choice of communication interface: RS232 or RS485 communication interface, users can only choose one of the standard communication interfaces to access the module.
          For the RS232 communication interface, the three wires are connected to TXD, RXD and GND. For selecting the RS485 communication interface, prepare the RS232 to RS485 converter. The two RS485 wires correspond to 485+ and 485-. When wiring, you must pay attention to check the one-to-one correspondence between the port and the external wiring.
Case: The customer reported that the product has no signal output. After checking the picture, it was found that the RS232 line was connected to the RS485 terminal. This problem often occurs.

3、Operation to enter configuration mode.
 Short-circuit the CONFIG terminal to the ground wire (GND terminal), and then turn on the power. At this time, the module enters the configuration state. In this state, the configuration of the module is as follows:

At this time, you can modify the module's baud rate, checksum status and other parameters through the configuration command, and you can also select the communication protocol by setting the module's communication protocol command. When you are not sure about the specific configuration of a certain module, you can also install a configuration jumper on the CONFIG terminal, and then reconfigure the module when the module enters the configuration state.

4、Choice of communication protocol.
       A communication protocol can be compared to a language. If you want to communicate, you must have the same language. Shunyuan Technology products have two communication protocols to choose from, namely character protocol and RTU protocol. Which protocol is configured, you must select the corresponding communication protocol.
Case: The customer reported that the data cannot be saved after the product is configured and powered on again. After checking, the customer chose to set up the communication as RTU protocol after the character protocol was configured. As a result, there was no reply during the serial port software test. This is the phenomenon that some users often report that the protocol is configured and then tested but there is no reply.

Sunyuan data acquisition product software configuration reference technical data
      The ISO 4021 series / ISO DA series / ISO AD series / SY AD series / PIM series data collectors, data converters, and data acquisition and transmission meter products produced by Shunyuan Technology can not only set the communication protocol through the software, but also the user can reset Configure the address, baud rate, check status and data format of the module.
     When the communication protocol, baud rate, address and other parameters of the module need to be set, the CONFIG pin must be connected to the ground to make the module enter the configuration state, and then the corresponding settings can be made. After the initial configuration, when the module communicates with the host normally, please remove the short wire between the CONFIG pin and the ground terminal.

Data collector communication protocol setting method (ASCII / MODBUS RTU)
        SunYuan 4-20mA analog to RJ45/RS232/RS485 series AD conversion multi-channel data collector, and RS232/RS485 to 4-20mA analog signal DA series data collector products, fully support ASCII characters or MODBUS RTU communication protocol, users The module accuracy can be calibrated by program control, and the module address and baud rate can be set by programming. Through the configuration of the software, it can match and collect various types of sensor signals to PLC, DCS or computer to monitor the use environment or control remote equipment.

     Products are widely used in Ethernet Internet of Things analog quantity, digital quantity RJ45 interface data acquisition, RS232/RS485 interface field bus industrial automation control system, various sensor analog signal measurement, monitoring and control, measurement of small signals (precision better than 0.05% ) And industrial field signal long-line distortion-free transmission, remote anti-interference isolation monitoring and other occasions.
     In response to the user's needs for external communication equipment, the user can set the product to ASCII characters or MODBUS RTU communication protocol. Taking ISO 4021 series data collector products as an example, how to set ASCII characters or MODBUS RTU communication protocol is described through the field wiring diagram. The setting method of other (SY AD series / ISO AD series) data acquisition products is similar to the ISO 4021 series products, please refer to the ISO 4021 setting method.

Setting steps:
一、Connect the power and communication lines of ISO 4021 products (take RS485 as an example), and short-circuit pins 7 and 8 (as shown in the figure):

Bus, Ethernet data acquisition Sunyuan technology patent product reference technical data