KNX LogicMachine3 Re:actor, Product Manual

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7. Modbus RTU/TCP interconnection with LM2
Modbus RTU is supported over RS485 interface. Modbus TCP is supported over Ethernet port.
Modbus communication is done directly from scripts (usually resident script is used to read
Modbus value after some specific time interval and write them into KNX object).
Once script is added, you can add the code in the Script Editor. There are lots of predefined code
blocks in the Helpers.
7.1. Master functions
mb:setslave(slaveid)
Sets slave id to read/write data from/to
mb:readcoils(start, count)
mb:readdiscreteinputs(start, count)
mb:readregisters(start, count)
mb:readinputregisters(start, count)
Reads count registers/coils from the start address. Returns all values on success and nil, error
description on error
mb:writebits(start, v1, [v2, [v3, ...]])
mb:writeregisters(start, v1, [v2, [v3, ...]])
Writes values to registers/coils from the start address. Single write will be used when only one
value is supplied, multiple write otherwise. Returns all of values written on success and nil, error