in reply to: Extended command numbers posted by Antje Teunissen on 02 December 2011 at 12:44:36.
I think the answer is that it *must* send the Invalid Extended Command code. This is implied by two parts of the specs:
HCF_SPEC-307, 6.21 RC #20: Invalid Extended Command Number. The Extended Command Number was less that 512.
HCF_TEST-1 (towards the end):
SEND Command 31 with Data = 0x00, 0x03
IF (RESPONSE CODE != 'Invalid Extended Command Number')
THEN test result is FAIL