Success!!! AdderD & Palliser thank you both again the priceless HINTS. After an hour of tweaking the code this evening I was able to tap into both the internal and OBD2 bus, the data flowed through into the serial monitor as if a flood gate was opened. Sorry TI for doubting the 3.3V compatibility to 5V (after the disappointment last night I ordered 10pcs of TJA1055/c thinking 3.3V is not what TI claimed to be). Next stop, double back to the consumer mode, set the ACK bit and make DUE as a node on the bus. It's exciting. Again without the inputs from both of you I would still be going in circles. The IRQ worked like charm, it's better than having to loop and loop to get the serial stream from CAN232 and miss 5-10% of the frames. I am SOLD!!!