====== ImodbusRTUMem() ======

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

{{:en-us_commands:reference:imodbusrtumem.svg?900|ImodbusRTUMem command operation flow}}

''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 =====

<code cpp>
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;
}
</code>

===== 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 =====

  * [[:en-us_commands:reference:imodbusrtuadr|ImodbusRTUAdr() View detailed description]]
  * [[:en-us_commands:reference:imodbusrtuinit|ImodbusRTUInit() View detailed description]]
  * [[:en-us_commands:reference:imodbusrtu|ImodbusRTU() View detailed description]]

[[:en-us_commands:builtin|← Built-in Command List]]