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Originally published on Geo SCADA Knowledge Base by Anonymous user | June 10, 2021 03:17 AM
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The Modbus protocol supports the transmission of binary (coil/status) and register (input/output) data across a telemetry link. Register data comes in 16 bit chunks and can contain an assortment of data values. ClearSCADA currently supports the retrieval of numeric (integer and floating point) from one or more adjoining registers or digital data (1, 2 or 3 bits) from part of a register.
Although numeric and digital values are the most common use of Modbus registers other applications have been used. Another common and generic use of Modbus registers is to store string data which may represent some operational information about the site (e.g. location, site name, contact name, equipment asset information).
A string point should be added to the Advanced Modbus driver to allow the recovery of ANSI/Unicode string from a Modbus device.
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