The start and stop bit are already included as part of the UART protocol. When you send a byte it first sends the start bit, then the byte, then the stop bit. You don't need to do anything to make those bits send.

`20` is actually sent as `0001010001`

So your code will just be a series of `Serial.write()` calls for each byte you want to send.

    Serial.write(1);
    Serial.write(20);
    Serial.write(1);
    Serial.write(1);
    Serial.write(0);
    Serial.write(0);

Or as an array:

    uint8_t data[6] = {1, 20, 1, 1, 0, 0};
    Serial.write(data, 6);