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MTL8000Process Control for Process I/OModbus Communications ManualApplication NoteCONTENTSiContentsAN8002 1 April 1999MODBUS IS MODBUS?................................. ........................................ ........................................ ...............2MODBUS QUERY-RESPONSE TRANSMISSION MESSAGE MESSAGE address function data error check ENCODING AND CONCEPTS AND register and flag organisation and & CONTROL COIL STATUS (FUNCTION 01)..................................... ........................................ ...........................9READ INPUT STATUS (FUNCTION 02)..................................... ........................................ ........................10READ HOLDING REGISTERS (FUNCTION 03)..................................... ........................................ ............11READ INPUT REGISTERS (FUNCTION 04)..................................... ........................................ ..................12FORCE SINGLE COIL (FUNCTION 05).

MODBUS COMMUNICATIONS 1 Modbus Communications Introduction This manual provides a background to the Modbus protocol and, broadly, how it is implemented for the MTL8000 Series1 of bus interface equipment for process I/O. It is only

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