ImodbusRTUMem()

ImodbusRTUMem()

ImodbusRTUMem() sets the sizes of M and D memory used by the Slave.

void ImodbusRTUMem(uint16_t m_size, uint16_t d_size)

Commands

Command	Arguments	Return Value	Operation
`ImodbusRTUMem(m_size, d_size)`	`uint16_t m_size` `uint16_t d_size`	`void`	Sets the sizes of M and D memory used by the Slave.

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

ImodbusRTUMem()

Commands

Example

Precautions

Built-in Commands in the Same Category