moacon:rtu_readinregs:index
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.
u8 registerBuffer[100]; res = RTU_readInRegs(0,1,registerBuffer,0,2);
moacon/rtu_readinregs/index.txt · Last modified: 2016/04/14 11:07 (external edit)