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.

u8 registerBuffer[100];
res = RTU_readRegs(0,1,registerBuffer,0,2);

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