Modbus - Write bits in word

[admin]

This script will set bit 0 if 1/1/1 is on, bit 1 if 1/1/2 is on etc. Adjust as needed and add writing to ModBus register at the end of the script.

Code:

function setbit(value, bitnr)
  local mask = bit.lshift(1, bitnr)
  return bit.bor(value, mask)
end

value = 0

if grp.getvalue('1/1/1') then
  value = setbit(value, 0)
end

if grp.getvalue('1/1/2') then
  value = setbit(value, 1)
end

if grp.getvalue('1/1/3') then
  value = setbit(value, 2)
end

log(value)