Is there any difference between Modbus RTU over TCP/IP and the so called Modbus TCP/IP?

Isn't both the Modbus RTU frame encapsulated in TCP frame?

 

MODBUS TCP/IP has other MODBUS message header.

 

Take a look at following documents for differences between Modbus ASCII, RTU and TCP telegrams.

http://web.eecs.umich.edu/~modbus/documents/PI_MBUS_300.pdf

http://www.modbus.org/docs/Modbus_Messaging_Implementation_Guide_V1_0b.pdf

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