MODBUS RTU
Function overview
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The MODBUS RTU protocol enables the communication between the FP-X and other devices
(including our FP-e, Programmable display GT series and KT temperature control unit).
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Enables to have conversations if the master unit sends instructions (command messages) to slave
units and the slave units respond (response messages) according to the instructions.
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Enables the communication between the devices of max. 99 units as the master function and slave
function is equipped.
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The communication cassette and the USB port can be used.
About MODBUS RTU
•
The MODBUS RTU communication is a function for the master unit to read and write the data in slave
units communicating between them.
•
There are ASCI mode and RTU (binary) mode in the MODBUS protocol, however, the FP-X is
supported with the RTU (binary) mode only.
Master function
Writing and reading data for various slaves is available using the F145 (SEND) and F146 (RECV)
instructions.
Individual access to each slave and the global transmission is possible.
Slave function
If the slave units receive a command message from the master unit, they send back the response
message corresponding to the content.
Do not execute the F145 (SEND) nor F146 (RECV) instructions when the unit is used as a slave unit.
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