Ankerui ammeter terminal introduction
How to find the RS485 interface:
There are two methods, one is to check directly from the side of the meter, the terminals are 30 and 31, A and B, the corresponding positions of A+ and B- connected to the USB line are as shown in the figure below, and the second is to read from the user manual 
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Download the serial port driver,
I use dtech's usb2.0 to 422\RS485 cable, usually there is a QR code inside, you can download the serial port driver
Serial tool use
I am using the HslCommunicationDemo serial port debugging assistant
to select modrtu in Modbus
Serial driver
After connecting the usb cable, how to check whether the driver is successfully installed
After the installation is complete, it looks like my third picture, and now you can start debugging
parameter settings
After the meter starts, you need to press the set key. The initial password is 1. After setting, you can check the station number of the meter. It should be 2, and then you can also read the baud rate. For some parts that cannot be seen after wiping, you should go to the official website of the device, download the user manual of the device, and check the stop bit, parity, etc. In the end, since the equipment is not at hand, I can tell you about the message, and you start the debugging assistant and communicate.
Check the first circuit load energy value message: 02 03 00 27 00 02
This debugging assistant does not need a check code, if there are other serial port assistants, you can search for the calculation of the check code. If you can't find the data attachment, please private message me.