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Using a Macro for Serial Port Communications

 

The EES Macro language provides the following macro commands to communicate with external devices through the serial port:

 

Serial.Open

Serial.ReadChar

Serial.ReadNumber

Serial.ReadString

Serial.ReadtoLookup

Serial.WriteChar

Serial.WriteNumber

Serial.WriteString

Serial.Close

 

Documentation for the use of these serial port commands is found in the Macro Command list.

 

Shown below is a very simple example that communicates with the Arduino Uno board.  

 

The Arduino program is:

 

/*

  myBlinker

  Turns on an LED on or off by a signal sent through the serial port. 

  The Arduino acknowledges the action by wrting a string to the serial port.

*/

 

char C;

void setup() {

  // initialize digital pin 13 as an output.

  pinMode(13, OUTPUT);

  Serial.begin(9600);

}

 

// the loop function runs over and over again forever

void loop() {

delay(1000);              // wait for a second

if (Serial.available() >0) {

      C=Serial.read();

      if (C=='H') {

          digitalWrite(13, HIGH);   // turn the LED on (HIGH is the voltage level)

          Serial.println("Bulb is on");

      }

      if (C=='L') {

         digitalWrite(13, LOW);    // turn the LED off by making the voltage LOW 

         Serial.println("Bulb is off"); 

      }

  }

}

 

 

The EES Macro program is:

 

//Test of communication with the Arduino UNO board.  

//This macro simply causes the Arduino to alternately turn on an off the LED.

 

ict=0

Serial.Open  Port=Com4  Baud=9600  Parity=n  BufferSize=2048  TimeOut=1000

repeat

   ict=ict+1

   Serial.WriteChar(COM4,'H')  //Note that the parentheses are optional

   Serial.ReadString  COM4  H$

   pause 1

   Serial.WriteChar  COM4  'L'

   Serial.ReadString  COM4  H$

   pause 1

until (ict>=5)

Serial.Close(COM4)

 

 

A listing of the EES Macro file after running this macro is:

 

Starting execution of MACROWINDOW at: 11/6/2015 4:10:25 PM

ict=0

Serial port COM4 has been opened.

ict=ict+1

H written to serial port H.

String 'Bulb is on' read from serial port COM4.

L written to serial port L.

String 'Bulb is off' read from serial port COM4.

ict=ict+1

H written to serial port H.

String 'Bulb is on' read from serial port COM4.

L written to serial port L.

String 'Bulb is off' read from serial port COM4.

ict=ict+1

H written to serial port H.

String 'Bulb is on' read from serial port COM4.

L written to serial port L.

String 'Bulb is off' read from serial port COM4.

ict=ict+1

H written to serial port H.

String 'Bulb is on' read from serial port COM4.

L written to serial port L.

String 'Bulb is off' read from serial port COM4.

ict=ict+1

H written to serial port H.

String 'Bulb is on' read from serial port COM4.

L written to serial port L.

String 'Bulb is off' read from serial port COM4.

Serial port COM4 has been closed.

Stopping at: 11/6/2015 4:10:45 PM