© 2020 Weinzierl Engineering GmbH
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5.16 General information
5.16.1 Scaling
The scaling factor can be defined with the respective minimum/maximum values.
Example:
Value minimum (register) = 0
Value maximum (register) = 100
Value minimum (KNX) = 0
Value maximum (KNX) = 10
The result is scaling * 10 of the KNX value:
Value KNX = 10.5
→
Value Register = 105
The conversion is always transferred to the entire register area.
Value minimum/maximum (register) defines no limits.
5.16.2 2th complement
The 2th complement is used in Modbus registers to represent negative values. Thus, for example,
a range of -32768...32767 can be displayed on a word register.
5.16.3 Modbus communication
If the KNX Gateway (master mode) does not receive a response from the slave within 1 second,
the request is repeated twice. If these are not successful, all channels of this parameter page are
skipped.
If the slave takes longer than 1 second to process the data, it can send an acknowledge telegram
which restarts the time interval at the master.