Thanks! Yes, there is certainly some overhead with Mode 3. Have done some sample frequency tests (results here [Post #12]: http://www.gearhead-efi.com/Fuel-Injection/showthread.php?2811-Need-Help-With-Mode-3-ALDL-Command ). Would be interesteed in what sample frequency you are seeing in various mode...

On our aussie PCMs you can get everything using mode 2 requests for 64 byte blocks. Mode 3 we dont use very often due to it being only 1 byte of data returned but that still works for any address too. Mode 2 Frame To Send: F4 58 02 00 00 CS This requests a 64 block starting from address 0000. The C...

'7730 $8d using TPro RT v5 - Is it possible to make a Mode 3 request to read a memory mapped i/o address (eg. 1-byte 0x4008); and if so, how would it be entered in the transmit string? "0x40 0x08" does not work as it does if it was a memory address. Is a different format required for addre...