ECM NOxCAN, Instruction Manual, Page: 10 / 46

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4.0 Getting Information from the NOxCAN Module
As soon as power is attached to the NOxCAN module, it will perform a POWER ON/RESET
sequence during which the bi-color LED will display a 2 second GREEN/BOTH/RED pattern.
After the POWER ON/RESET sequence is finished, the LED will flash green at 10Hz until the
NOx sensor has reached its operating temperature. This may take up to 30 seconds. Once the
sensor is ready and the NOx and O
2
data is valid, the bi-color LED will display GREEN
continuously.
If there is an error, the LED color will change to RED and flash a number of times every 2
seconds indicating an error code. This error code will also be transmitted on the CAN bus. See
ECM Error codes in Appendix A.
Approximately 5 seconds after power is applied, the unit will start broadcasting CAN messages
at a CAN baud rate of 500kbps. All messages are related to the Node ID (NID) of the particular
module. As shipped, the NID is pre-assigned and is written on a label above the LED. The NID
can be changed using the supplied configuration software.
4.1 CANopen
Message Types
i) HEARTBEAT (Broadcast rate = 0.5sec, DLC=1)
CAN id byte 0 byte 1 byte 2 byte 3 byte 4 byte 5 byte 6 byte 7
0x700+NID value
value = NMT STATE (see Appendix C)
ii) ERROR (Broadcast rate = 0.250sec, DLC=6)
CAN id byte 0 byte 1 byte 2 byte 3 byte 4 byte 5 byte 6 byte 7
0x80+NID 0x00 0xFF 0x81 lo byte 0x00 count
lo byte = ECM Error Code (0x01 = Sensor Warm-up, 0x00 = Data valid, see Appendix A)
count = Sensor Warm-up countdown in seconds (active during ECM Error Code 0x01)