4-20mA is an output and cannot be used as a communication way. RS485 and RS232 are the physical electrical specifications for communication networks. Like a phone line and how you talk on it. Modbus is the actual communication protocol, like the language being spoken.
Modbus TCP/IP.
Modbus TCP/IP. TCP/IP. TCP is Transmission Control Protocol and IP is Internet Protocol. These protocols are used together and are the transport protocol for the internet. When modbus information is sent using these protocols, the data is passed toTCP where additional information is attached and given to IP.
Modbus RTU
Modbus RTU is an open, serial (RS-232 or RS-485) protocol derived from the Master/Slave architecture. It is a widely accepted protocol due to its ease of use and reliability. Modbus RTU is widely used within Building Management Systems (BMS) and Industrial Automation Systems (IAS).
MODBUS
Modbus is a serial communication protocol developed by Modicon published by Modicon® in 1979 for use with its programmable logic controllers (PLCs). In simple terms, it is a method used for transmitting information over serial lines between electronic devices.
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