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Product Overview
u  About Modbus Protocol Versions
Versions of the Modbus protocol exist for serial port, and for Ethernet and other protocols
that support the Internet protocol suite . There are many variants of Modbus protocols:
Modbus RTU — This is used in serial communication and makes use of a compact, binary
representation of the data for protocol communication.
Modbus ASCII — This is used in serial communication and makes use of ASCII characters
for protocol communication.
Modbus TCP/IP or Modbus TCP — This is a Modbus variant used for communications
over TCP/IP networks, connecting over Port 502. It does not require a checksum
calculation, as lower layers already provide checksum protection.
Modbus over TCP/IP or Modbus over TCP or Modbus RTU/IP — This is a Modbus
variant that differs from Modbus TCP in that a checksum is included in the payload as with
Modbus RTU.