Sending Hex values using arduino ide

Projects Programming
1

Hello I am trying to send hex values to serial then monitoring the response I get from a old current loop device.

This is my code:

void setup() {
  // put your setup code here, to run once:

  pinMode(13, OUTPUT);
Serial.begin(4800,SERIAL_8E1);
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(10000);
  byte inByte1 = 0xF1;
  byte inByte2 = 0x10;
  byte inByte3 = 0xB0;
  
  Serial.write(inByte1);
  Serial.write(inByte2);
  Serial.write(inByte3);
delay(70);

byte inByte4 = 0xE1;
 while (Serial.available()) {
    byte inChar = Serial.read();
    Serial.println(inChar);
    if(inChar == inByte4)
    {
       digitalWrite(13, !digitalRead(13));
    }
  }

}

When I run this exact hex through a fdti usb device using my windows delphi program I get a response however when I run this through the nano I am using I get no response from the device.

I also get this in my serial monitor

ñ°ñ°ñ°ñ°

This is the result I get after 4 loops. I know that this is not a well formed question but if you can see anything that would result in the hex values being sent incorrectly please let me know.

2

I think the serial monitor is 8N1.

Serial.begin(4800,SERIAL_8E1);
3

Thanks that might be it

4

If that is all you change, you will still get the "funny characters" instead of the hex values. Is that what you want?

5

Yeay, serial monitor sees every received byte as an ascii character...

6

I have checked the request from my delphi program by linking the usb fdti to the nano and I get out

241
16
176

and when I monitor my nano using the serial to usb I get

241
16
176

Is it possible that although they are displaying the same the output values are different as the one gets a response the other doesnt

7

Those appear to be the correct decimal values for those hex numbers. Is that what you want? If you want a hex output, you should use this.

  Serial.println(inByte1,HEX);
  Serial.println(inByte2,HEX);
  Serial.println(inByte3,HEX);
8

Maybe you need to use a proper terminal program.
I often use Realterm.

http://realterm.sourceforge.net/

9

Okay I have removed the link to the current loop device and have just linked the tx straight to the rx and this is my code.

void setup() {

  pinMode(13, OUTPUT);
Serial.begin(4800,SERIAL_8E1);
}

void loop() {

  byte inByte1 = 0xF1;

  delay(3600);
  Serial.println(inByte1,HEX);


delay(80);

 while (Serial.available()) {
 byte inChar = Serial.read();
    if(inChar == inByte1)
    {
       digitalWrite(13, !digitalRead(13));
    }
    delay(3600);
  }
 delay(3600);
}

Why would the led not blink?

10

I have now used a real program and integrated a usb to serial listener into my circuit. I am receiving the hex values perfectly F1 11 B0 E1 from my input of F1 11 B0 but when I try read those the serial buffer on the arduino is empty. Any suggestions