Standard is a number in double format sent by the server to the device.
Binary is a string or array of HEX bytes.
Documentation on English
There is also a section on using formulas
The output channel number is indicated in the input channel table and they can be different. The output channel 1100 can be connected to the input channel 101. The signal number is configured in the template, in this case in the template of the Modbus device and they can also be different. For the input channel, according to the template, reading the 30100 register can have a signal number of 5, and the command to write to the same register can have a signal number of 1. As you configure the template, such signal numbers will be obtained and it is them that you use to bind in the channel database.