Improvement: conversion of input/output variables

[dev-gb]

In a direct slave to slave communication a conversion of data may be needed.

For example, when a slave sends a temperature in Celsius and the receiving slave expects it in Fahrenheit.

Therefore a factor and offset as defined in UnitDefinitions is required.
BaseUnit_value = factor * Unit_value + offset

Could be addet to CFG_INPUT or CFG_OUTPUT PDU

[martinkrammer]

To consider:

• BaseUnit_value = factor*Unit_value + offset would only consider linear relationships
• How could multidimensional variables be handled
• How can factor and offset be communicated (only relevant for slave-to-slave communication)
• In case of master-to-slave communication master could take care of this

[martinkrammer]

Further points:

• Indicate capability of slave to convert between units

Decided in web meeting to label Backlog.