25
Jack
port of an external
computer
7.2.1 Parameter of RS232 serial communication
Baud rate: 9600 BPS
Length of characters: 1 byte is start, 8 bytes is data and 1 byte for stop
Test method: no test7.2.2 O3H order given by external computer (host machine), referring
to real-time data (without stops, e.g. once every 1 or 0.5 second) The instrument
corresponds and gives back ACK(06H), HC, CO, CO
2
, O
2
, NO
x
, n, T, λ and check sum.(As
for the meaning of the data, please refer to the next section)
8. Test process controlled by host copmputer
8.1 Telecommunication order
8.1.1 Pump switch on
External computer gives out: 01H
Correspondence of the instrument: ACK(06H)
8.1.2 Pump switch off
External computer gives out: 02H
Correspondence of the instrument: ACK(06H)
8.1.3 Obtaining real-time data
External computer gives out: 03H
The instrument corresponds ACK(06H), HC, CO, CO
2
, O
2
, NO
x
, n, T, λ and check sum.
8.1.4 SET engine to be four stokes
External computer gives out: 04H
Correspondence of the instrument: ACK(06H)
8.1.5 SET engine to be two stokes
External computer gives out: 05H
Correspondence of the instrument: ACK(06H)
8.1.6 SET gasoline as fuel
External computer gives out: 06H
Correspondence of the instrument: ACK(06H)
8.1.7 SET LPG as fuel