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Author Topic: APC220 Ver 3.0 Not Communicating  (Read 212 times)
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I think I have done what all the startup sites suggest.  I used the startup program:

int val = 0;
int ledPin = 13;
void setup()

void loop()
  val =;
  if (-1 != val) {
   if ('A' == val || 'a' == val) {
     Serial.println("Hello from Arduino!");
   }else if ('B' == val || 'b' == val) {
      digitalWrite(ledPin, HIGH);
      digitalWrite(ledPin, LOW);

I loaded the Arduino from the pc with the TX and RX wires to the APC disconnected.  Then disconnected the PC from the Arduino and started it with battery.  I changed the pc from the original COM5 to the pc side APC, COM6.  No communication either TX or RX.  The program works because I can run it without the APC, just though the direct pc to Arduino board.  I tested both modules on the pc using rc magic.

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