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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
DESCRIPTION
D
Enter Command
0h
Mode
1h
8 bit λ
2h
16 bit λ High Byte
3h
16 bit λ Low Byte
4h
16 bit Ri High Byte
5h
16 bit Ri Low Byte
6h
16 bit %O
7h
16 bit %O
8h
16 bit AFR High Byte
9h
16 bit AFR Low Byte
Ah
16 bit FAR High Byte
Bh
16 bit FAR Low Byte
Ch
16 bit Ip High Byte
Dh
16 bit Ip Low Byte
Eh
Fh
PWR (Green) LED
ON
OFF
OFF
OFF
OFF
Flashing
ON
ON
RANGE
0.744 to 1.235
0.549 to 1.235
0 to 400 Ω
High Byte
0.0 to 4.03
2
Low Byte
2
8.0 to 18.0
0.055 to 0.125
-2849 to 492
µA
N/A
N/A
ERR (Red) LED
FLASH CODE
OFF
1
2
3
4, 5, or 6
OFF
ON
ON
FORMULA
See Command Mode and Device
Identification Sections
λ = (Data Byte + 186)/250
λ = (High Byte*256 + Low Byte)/1000
Ri = (High Byte*256 + Low Byte)/10
%O
= (High Byte*256 + Low Byte)/100
2
AFR = (High Byte*256 + Low Byte)/100
FAR = (High Byte*256 + Low
Byte)/10000
Ip = (High Byte*256 + Low Byte)/10
AFM1540 Status Code (See table below)
STATUS CODE
0
Data valid/Sensor OK
Sensor not connected
1
2
Power supply voltage
3
4, 5, or 6
8
9
10
CONDITION
or heater open
Heater short
out of range
Sensor damaged
30 second warm-up
EE Fault
Command Mode
7
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