ImodbusRTUInit()

ImodbusRTUInit()

ImodbusRTUInit() sets the communication port, station number and baud rate.

void ImodbusRTUInit(HardwareSerial& serialPort, uint8_t slaveId, long baudrate)

Commands

Command	Arguments	Return Value	Operation
`ImodbusRTUInit(serialPort, slaveId, baudrate)`	`HardwareSerial& serialPort` — Serial port connected to RS-485 `uint8_t slaveId` — Slave address `long baudrate` — Baud rate	`void`	Sets the communication port, station number and baud rate.

Example

void setup() {
  ImodbusRTUMem(100, 200);  // Set the M·D memory sizes used by the Slave.
  ImodbusRTUAdr(0, 0);  // Set the start addresses of M·D memory.
  ImodbusRTUInit(Serial1, 1, 115200);  // Set the communication port, station number and baud rate.
}
 
void loop() {
  ImodbusRTU();  // Check incoming requests and process Slave responses.
  D[0] = 100;
  D[3] = 200;
}

Precautions

Keep calling the Slave or Master execution function in loop().
The data array size must be at least the requested quantity.
Do not treat return codes BUSY and IDLE as communication failures.
When sharing M and D with Cnet/MC Protocol, define a single final size and initialization order. Do not call ImodbusRTUMem() or ICnetMem() again at runtime.
Memory allocation functions do not return success status. For nonzero sizes, verify that M and D are not nullptr before accessing them in user code.

Built-in Commands in the Same Category

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Table of Contents

ImodbusRTUInit()

Commands

Example

Precautions

Built-in Commands in the Same Category