Modbus, getting bits in a register

[Simuzer]

You can use this helper function:

Code:

function getbit(value, nr)   value = bit.rshift(value, nr)   return bit.band(value, 1) end value = mb:readregisters(123) if value then   dampers_open = getbit(value, 0)   fire_dampers_open = getbit(value, 1)   ... end

Its work for read any bit of 16bit register.

i also write any bit of 16bit register this like..

Code:

function updatebit(bit_value, ModbusAddress, bit_no)   ????   ????   ???? end

For example;

Code:

 updatebit (true, 123, 0)  updatebit (false, 123, 5)

1. --
before modbus 123 register: 1010 1101 0110 1011 (=44.395)
after modbus 123 register: 1010 1101 0110 1010 (=44.394)
2.--
before modbus 123 register: 1010 1101 0110 1010 (=44.394)
after modbus 123 register: 1010 1101 0100 1010 (=44.362)