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+--- Thread: 16bit to 1byte (/showthread.php?tid=373)
16bit to 1byte - duvelken - 16.08.2016
hi guys,
i need to scale a modbus input which is 16bit to use as a knx scale object to get 0-255 for my lighting control.
the modbus output registers of the device are fixed at 16bit.
what is the best way to scale this ?
thx in advance
RE: 16bit to 1byte - MarkVersluis - 16.08.2016
Code:
grp.write('1/1/1', modbusvalue, dt.scale)or
Code:
value = knxdatatype.decode(modbusvalue, dt.scale)Something like that?
RE: 16bit to 1byte - admin - 17.08.2016
If your modbus device is using full 16-bit range [0..65535], you can use bit shift to discard lowest 8 bits:
Code:
value = bit.rshift(value, 8)
grp.write('1/1/1', value, dt.uint8) -- force value range to [0..255]Also, I would suggest using profiles instead of scripts.