ImodbusRTUmasterInit()

ImodbusRTUmasterInit() sets the Master communication port and baud rate.

void ImodbusRTUmasterInit(HardwareSerial& serialPort, long baudrate)
void ImodbusRTUmasterInit(HardwareSerial& serialPort, long baudrate, uint8_t config)

Commands

Command	Arguments	Return Value	Operation
`ImodbusRTUmasterInit(serialPort, baudrate)`	`HardwareSerial& serialPort` — Serial port connected to RS-485 `long baudrate` — Baud rate	`void`	Sets the Master communication port and baud rate.

Example

uint16_t data[10];
uint16_t readValue0;
uint16_t readValue1;
 
void setup() {
  ImodbusRTUmasterInit(Serial2, 9600);  // Set the Master's communication port and baud rate.
}
 
void loop() {
  uint8_t result;
 
  result = ImodbusRTUmaster(Serial2, 1, 0x03, 0, 2, data);  // Execute a single Master request immediately.
  if (result == IMODBUS_RTU_SUCCESS) {
    readValue0 = data[0];
    readValue1 = data[1];
  }
 
  data[0] = 1234;
  ImodbusRTUmaster(Serial2, 1, 0x06, 10, 1, data);  // Execute a single Master request immediately.
}

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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ILOGICS Product Documentation

Table of Contents

ImodbusRTUmasterInit()

Commands

Example

Precautions

Built-in Commands in the Same Category