====== RTU_readInRegs ======

''short RTU_readInRegs(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) |

Performs the same operation as RTU_readRegs but uses Modbus function code 4. The MOACON does not
distinguish between function codes 3 and 4, but some PLCs do. This function is provided so the MOACON
can interface properly with those PLCs that distinguish between function codes 3 and 4.

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

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