Riva:
You will know if the data is correct if you never get UART framing errors.
I mentioned about the A/B high idle as adding a UART protocol decoder to the wrong one may cause wrong data values and framing errors to be returned in the decode data.This is just the sort thing I like working on and even looks at the Vado unit for playing with but it would be too expensive for just the fun of it.
Had to put this down for a bit again as I've been really struggling with it.
When I use the RS485 modules I can't seem to replicate the unit's initial pattern in a sensible way. I set the baud to 9600 but when I send a character it's so much shorter than the pattern from the unit.
The only way I've managed to get close is with the following but it's not using the RS485 module at all so I don't think it'll work with the unit:
long unsigned lastCom = 0;
long unsigned curMicros = 0;
const int digPinHigh = 30;
const int digPinLow = 31;
const int byteLen = 7;
bool valArray[] = {HIGH, HIGH, HIGH, HIGH, HIGH, HIGH, HIGH, HIGH, HIGH, HIGH};
const int bitLen = 104;
const unsigned long comPeriod = 55000;
void setup() {
pinMode(digPinHigh, OUTPUT);
pinMode(digPinLow, OUTPUT);
digitalWrite(digPinHigh, LOW);
digitalWrite(digPinLow, HIGH);
}
void loop()
{
curMicros = micros();
if ((curMicros > (lastCom + comPeriod)) || (curMicros < lastCom)) {
lastCom = curMicros;
for (int j = 0; j < byteLen; ++j) {
for (int i = 0; i < sizeof(valArray); ++i) {
digitalWrite(digPinHigh, valArray[i]);
digitalWrite(digPinLow, valArray[i] == HIGH ? LOW : HIGH);
delayMicroseconds(bitLen);
}
digitalWrite(digPinHigh, LOW);
digitalWrite(digPinLow, HIGH);
delayMicroseconds(bitLen);
}
}
}