====== RTU_readRegs ======

''short RTU_readRegs(u8 comCh, u8 slaveAdr, u8* result, u16 targetAdr, u8 numOfRegs)''
|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 |
|numOfRegss: Number of registers (words) to read |
|returns the status of this function call (-1=Success, 0=Timeout, 1=Data Error) |

Reads numOfRegs words 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. This
function used Modbus function code 3.

<code c>
u8 registerBuffer[100];
res = RTU_readRegs(0,1,registerBuffer,0,2);
</code>

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