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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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moacon/rtu_readregs/index.txt · Last modified: 2016/04/14 11:07 (external edit)