====== RTU_readCoils ======

''short RTU_readCoils(u8 comCh, u8 slaveAdr, u8* result, u16 targetAdr, u8 numOfCoils)''
|''comCh'': The RS-232 channel to use |
|''slaveAdr'': The Modbus slave address of the device to read from |
|''result'': Buffer to store coil (bit) data to |
|''targetAdr'': The address of the data to read |
|''numOfCoils'': Number of coils (bits) to read |
|returns the status of this function call (''-1''=Success, ''0''=Timeout, ''1''=Data Error) |

Reads ''numOfCoils'' bits from slave device ''slaveAdr'', at address ''targetAdr'', on RS-232 channel ''comCh'' and
stores the data in ''result''. Returns a number indicating whether or not the function call was successful.

<code c>
u8 coilBuffer[100];
res = RTU_readCoils(0,1,coilBuffer,4,12);
</code>

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