ECM F/A1000, Instruction Manual, Page: 10 / 26

6
COMMAND 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 F/A1500 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 ON Command Mode
Command Mode
Command Mode is used to auto-detect F/A1500 and AFM1500 modules on the SMB bus.
After the reception of command XXXX 0000 (where XXXX = module address) the module
switches into Command Mode and waits for a second byte. Upon entering Command Mode,
wait 30 ms minimum before issuing commands.
The sensor is powered off when the unit
is in Command Mode.
The module remains waiting until a second byte with the correct
device number in the high-nibble is received.