The AFM1540 module addressed responds (within 1 ms max.) with the byte of data
requested.
The command from the PC to the AFM1540 modules and the conversion formulas for the
data from the AFM1540 modules to the PC are given in the following table. The state
diagram for SMB communication is at the back of this instruction manual.
COMMAN
D
DESCRIPTION RANGE
FORMULA
0h
Enter Command
Mode
See Command Mode and Device
Identification Sections
1h 8
bit
λ
0.744 to 1.235
λ
= (Data Byte + 186)/250
2h 16
bit
λ
High Byte
0.549 to 1.235
λ
= (High Byte*256 + Low Byte)/1000
3h 16
bit
λ
Low Byte
4h
16 bit Ri High Byte
0 to 400
Ω
Ri = (High Byte*256 + Low Byte)/10
5h
16 bit Ri Low Byte
6h
16 bit %O
2
High Byte
0.0 to 4.03
%O
2
= (High Byte*256 + Low Byte)/100
7h
16 bit %O
2
Low Byte
8h
16 bit AFR High Byte
8.0 to 18.0
AFR = (High Byte*256 + Low Byte)/100
9h
16 bit AFR Low Byte
Ah
16 bit FAR High Byte
0.055 to 0.125
FAR = (High Byte*256 + Low
Byte)/10000
Bh
16 bit FAR Low Byte
Ch
16 bit Ip High Byte
-2849 to 492
µ
A
Ip = (High Byte*256 + Low Byte)/10
Dh
16 bit Ip Low Byte
Eh
N/A
AFM1540 Status Code (See table below)
Fh N/A
PWR (Green) LED
ERR (Red) LED
FLASH CODE
STATUS CODE
CONDITION
ON
OFF
0
Data valid/Sensor OK
OFF 1 1
Sensor not connected
or heater open
OFF 2 2
Heater
short
OFF 3 3
Power supply voltage
out of range
OFF
4, 5, or 6
4, 5, or 6
Sensor damaged
Flashing
OFF
8
30 second warm-up
ON ON 9
EE
Fault
ON
ON
10
Command Mode
7
Содержание AFM1040
Страница 1: ...AFM1040 AFM1540 Air Fuel Ratio Combustion Monitor Instruction Manual 02 06 Part Number 1040A 6...
Страница 4: ...Supplementary Information 17 ii...
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Страница 25: ...State Diagram for SMB Communication 21...
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Страница 30: ...Los Altos CA 94023 0040 USA 408 734 3433 Fax 408 734 3432 www ecm co com...