Practical Limits of Serial communications?

Projects Networking, Protocols, and Devices
16

Done. Using this code, I get "Setup complete", two zeros, nothing more. I wonder if one of the RS485 chips is dead... Re-verified that the RE/DE on the receiver is 0V and that the RE/DE on the transmitting chip is 5V. Nuts.

/* YourDuino RS485 Slave Node A Example
 terry@yourduino.com */

/*-----( Declare Variables )-----*/
int ledPin=13;
int EN = 6;
byte Val;

void setup()/****** SETUP: RUNS ONCE ******/
{
  pinMode(ledPin, OUTPUT );
  pinMode(EN, OUTPUT );
  Serial.begin (9600);
  Serial.println("Setup Complete.");
}//--(end setup )---

void loop()  /****** LOOP: RUNS CONSTANTLY ******/
{
  // receive Data
  digitalWrite (EN, LOW ); // enable receive
  if (Serial.available()>0) {
    Val = Serial.read ();
    Serial.println(Val,HEX);
  }
}//--(end main loop )---