26
External computer gives out: 07H
Correspondence of the instrument: ACK(06H)
8.1.8 SET IGN.M. mode as ONCE
External computer gives out: OAH
Correspondence of the instrument: ACK(06H)
8.1.9 SET IGN.M. mode as DOUBLE
External computer gives out: OBH
Correspondence of the instrument: ACK(06H)
8.1.10 HC remained check
External computer gives out: 08H
Correspondence of instrument: testing HC remained check: 00H
HC remained test finishes qualified: ACK (06H)
HC remained test finishes qualified :on NACK (15H)
8.1.11Zeroing in test
External computer gives out: 09H
Correspondence of instrument: zeroing is on the way: 00H
Zeroing completes, qualified: ACK (06H)
Zeroing completes, unqualified: NACK (15H)
8.1.12 Reading saved data
External computer gives out: 0FH
Correspondence of instrument: ACK(06H), data group, (number plate, test time, fast idle
HC, CO, CO
2
, O
2
, NO
x
, idle HC, CO, CO
2
, O
2
, NO
x
)(…) … checking sum.
Of which, data group is the total of data saved, (…) represents a group of data (altogether
33 characters), the number plate is 8-character ASCII code. When number plate is not
saved, 8 characters are 20H, the test time adopts binary system of 5 characters with year,
month, day, hh and mm occupying one character, five groups of fast idle occupy 2
characters (altogether 10), idle takes up 10 characters. The checking sum is the sum of all
previous data (2 characters).As for idle and general , “5 groups of fast idle” is the average
value of tested data and the 10 characters of “idle” are all FF.
After giving out OFH orders by external computers each time, the instrument could give