====== RTU_writeReg ======

''short RTU_writeReg(u8 comCh, u8 slaveAdr, u16 targetAdr, u16 value)''
|comCh: The RS-232 channel to use |
|slaveAdr: The Modbus slave address of the device to read from |
|targetAdr: The address of the data to read |
|value: Word value to write |
|returns the status of this function call (-1=Success, 0=Timeout, 1=Data Error) |

Writes a word value value to slave device slaveAdr, at address targetAdr, on RS-232 channel comCh.
Returns a number indicating whether or not the function call was successful. 

<code c>
res = RTU_writeCoil(0,1,0x0000,0x1234);      //Write word 0x1234 to slave device
                                             //1, address 0x0000
</code>

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