====== ImodbusRTUInit() ======

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

{{:en-us_commands:reference:imodbusrtuinit.svg?900|ImodbusRTUInit command operation flow}}

''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 =====

<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:imodbusrtumem|ImodbusRTUMem() View detailed description]]
  * [[:en-us_commands:reference:imodbusrtuadr|ImodbusRTUAdr() View detailed description]]
  * [[:en-us_commands:reference:imodbusrtu|ImodbusRTU() View detailed description]]

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