73
2.
-- verify that the requested object was found
3.
if myobject then
4.
myobject:write(52.12, dt.float16)-- explicitly set data type to dt.float16 (2-byte
floating point)
5.
end
Switch all binary objects tagged 'lights' off.
1.
lights =grp.tag('lights')
2.
lights:write(false)
Group write to the specified group address and data type.
1.
grp.write('1/1/1', true, dt.bool)-- write 1-bit 'on' to 1/1/1
2.
grp.write('1/1/2', 50, dt.scale)-- write 1-byte 50% to 1/1/2
6.1.12. Data type functions, data types
knxdatatype object provides data encoding and decoding between Lua and KNX data formats.
knxdatatype.decode(value, datatype)
Converts hex-encoded data to Lua variable based on given data type. Data type is specified
either as KNX primary data type (integer between 1 and 16) or a secondary data type (integer
between 1000 and 16000).Return values:
success decoded data as Lua variable (type depends on data type), value length in
bytes
error nil, error string
6.1.13. Data types
The following data types can be used for encoding and decoding of KNX data. Data
representation on Lua level and predefined constants (in bold) is given below:
1 bit (boolean) - dt.bool boolean
2 bit (1 bit controlled) - dt.bit2 number
4 bit (3 bit controlled) - dt.bit4 number
1 byte ASCII character - dt.char string
1 byte unsigned integer - dt.uint8 number
1 byte signed integer - dt.int8 number
2 byte unsigned integer - dt.uint16 number
2 byte signed integer - dt.int16 number
2 byte floating point - dt.float16 number
3 byte time / day - dt.time table with the following items:
o day number (0-7)
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