If the system allow, user should start by trying 1 or 2 tags/data with basic data type like Holding Register (int16) or Output Coil (bool), and slowly adding more tags before advancing to more complicated data type like real32 or long32. Too many aspects need to be of concern hence plug and play is almost impossible for two applications from different vendors for the first time. Modbus is a very old protocol that has too many interpretations and implementations by various vendors, making it one of the widely used but complicated protocol to establish at the beginning. This perspective will be more relevant for System Integrator Engineer.
Unlike other documentation for Modbus, this document focus on the knowledge needed for establishing the communication rather than implementing it. On top of basic communication port setting, it’s necessary to understand basic Modbus protocol before trying to establish a Modbus link.
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