Communication Protocol

Writing on Digital Input

Sent one byte in 0x0N hexadecimal format where N is the number of input followed by a second byte with value 0x00 for disable or 0x01 for enable.

Example to turn on the input 2:

            Serial_write(0x02);
            Serial_write(0x01);

Reading Digital Output

Sent one byte in 0x1N hexadecimal format where N is the number of output and read one byte. The byte readed have value 0x00 for disable or 0x01 for enable.

Example to read output 3:

      Serial_write(0x13);
      valor=Serial_read(0);

Writing on Analog Input

Sent one byte in 0x2N hexadecimal format where N is the number of input followed by two bytes with the 16 bits value.

Example to write the value 230 on analog input 1:

            Serial_write(0x21);
            valor=230;
            Serial_write((valor&0xFF00)>>8);
            Serial_write(valor&0x00FF);

Reading Analog Output

Sent one byte in 0x3N hexadecimal format where N is the number of output and read two bytes to form the 16 bits value.

Example to read analog output 2:

      Serial_write(0x32);
      valorh=Serial_read(0);
      valorl=Serial_read(0);
      valor=(valorh<<8)|valorl;

def:espmsim