Update index.js Issue #1175

[rvbatista]

Issue #1175
should be something like this, but I was not able to test.

[unocelli]

@rvbatista Hi, My proposal was to use the settings fragment: if fragment is enabled in the device then I will use writeRegister instead of writeRegisters. what do you think about?

[rvbatista]

I'm not sure, you see depends on the variable type also, INT should use WriteRegister, and any double REAL, DINT, etc.. should always use WriteRegisters.

As fuxa was only using WriteRegisters, I think that it's interesting to have a user accessible setting to control this behavior.

Fragment feature is already used by Modbus?

[unocelli]

The Problem is that value is not only a bytes array,
var _writeMemory = function (memoryAddress, start, value) {

Int16, Uint16 = 2 bytes
Int32, UInt32 = 4 bytes
Bool = number

If we define that 1-2 with WriteRegister and 4-8 with WriteRegisters will work for every device? is modbus standard?

[rvbatista]

For me both should work, but by specification there is the function to write single register (WriteRegister) and Write Multiple Registers (WriteRegisters) both are 16 bits based for each register.

[unocelli]

Thanks a lot.