====== RTU_writeCoil ======

''short RTU_writeCoil(u8 comCh, u8 slaveAdr, u16 targetAdr, u8 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: Bit value (0 or 1) to write |
|returns the status of this function call (-1=Success, 0=Timeout, 1=Data Error) |

Writes a bit 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(0,1,0x0000,1);    //Write a 1 to slave device 1,
                                      //address 0x0000

</code>

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