MODBUS MESSAGING ON TCP/IP IMPLEMENTATION GUIDE V1
On reception of a MODBUS request this module activates a local action to read, to write or to achieve some other actions. The processing of these actions is done totally transparently for the application programmer. The main MODBUS server functions are to wait for a MODBUS request on 502 TCP port, to treat this request and then to build a
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Modicon Modbus Protocol Reference Guide
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