IMcAdr()

IMcAdr() sets the start addresses of X, Y, M and D memory.

void IMcAdr(uint16_t x_offset, uint16_t y_offset, uint16_t m_offset, uint16_t d_offset)

This example uses the MPINO-16A8R8T RS-485 port Serial2, input D22, and transistor output D39.

void setup() {
  IMcMem(32, 32, 64, 64);  // Set the X·Y·M·D memory sizes used by MC Protocol.
  IMcAdr(0, 0, 0, 0);  // Set the start addresses of X·Y·M·D memory.
  IMcInit(Serial2, 1, 9600);  // Set the communication port, station number and baud rate.
}
 
void loop() {
  IMcProtocol();  // Check incoming requests and process MC Protocol responses.
  if (X != nullptr) X[0] = digitalRead(22) == HIGH;
  if (Y != nullptr) digitalWrite(39, Y[0] ? HIGH : LOW);
}

• Keep calling IMcProtocol() in loop().
• Do not confuse hexadecimal addressing for X/Y with decimal addressing for M/D.
• Do not use X/Y/M/D before allocating the pointers.
• If Cnet or Modbus reallocates shared M/D memory at runtime, the addresses used by MC Protocol change. Complete all memory size settings in setup() and do not call them again at runtime.
• Allocation functions do not return success status. For nonzero sizes, verify the corresponding global pointer is not nullptr before accessing it.

• IMcMem() View detailed description
• IMcInit() View detailed description
• IMcProtocol() View detailed description

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