After mucking around a bit, maybe something like this? -not sure if this is the most efficient way.
int val = 0;
int val1 = 0;
void setup() {
Serial.begin(9600); // opens serial port, sets data rate to 9600 bps
//int val = 0;
Serial.println("CLEARDATA");
}
void loop() {
Serial.print("DATA,TIME,");
Serial.println(val1);
val1 = random(0, 100);
delay(3000);
}