ECM NH3 5250, Инструкция по эксплуатации, Страница: 25 / 62

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The CAN data is broadcast at 500 kHz in the following format:
CANid byte 0 byte 1 byte 2 byte 3 byte 4 byte 5 byte 6 byte 7
CID1 What is being sent to analog output 1 What is being sent to analog output 2
CID2 What is being sent to analog output 3 What is being sent to analog output 4
CID3 What is being sent to analog output 5 What is being sent to analog output 6
CID4 What is being sent to upper display What is being sent to the lower display
ERCd Error code for upper display/channel Error code for lower display/channel
Error
Code
Low
Error
Code
High
Aux.
Code
Pressure
Err Code
Low
1
Error
Code
Low
Error
Code
High
Aux.
Code
Pressure
Err Code
Low
1
1
For LambdaCANp modules only.
Each of the eight parameters in CID1 to CID4 is a single-precision 32 bit floating point
number that conforms to the IEEE-754 standard. All eight of these parameters are
transmitted on the CAN bus least significant byte first (Intel format). Parameters 1 through 8
(everything except error codes) sent on the CAN bus are averaged (“AVG”d, see CAL Setup
Option ).
Error codes are transmitted with address ERCd. The error codes are 16 bit integers that refer
to those listed in Appendix C. The error codes are transmitted on the CAN bus least
significant byte first (Intel format). The auxiliary code is the countdown number appearing
on the channel’s display. If there is no error or active countdown, an error message is not
broadcast.
Addresses CID1 through CID4 and ERCd are user programmable. Refer to Appendix E on
how to program them and how to produce a .dbc file (which requires a PC running the
supplied Configuration Tool Software”). This .dbc file can be used with programs accepting
the VectorCAN .dbc format.
The rate at which CAN data is sent can be programmed via the “RATE” parameter under
“CAN”. The allowable range is 5ms to 9999ms with 5ms being the default.
The CAN baud rate is programmed via the “BAUd” parameter under “CAN”. 500K is the
default.

LOCK
“LOCK” locks the selection of displayed parameters and instrument setup. When locked, the
display head can just be turned on and off. It cannot be modified unless unlocked. Refer to
Appendix D for more information.

FACT
“FACT” (in the CONF Setup Option ) resets the NH
3
5250 to the default setup. The default
setup is shown [in square parentheses] in Table 1. “FACT” (in the CONF Setup Option
does not cancel a user calibration of the NH
3
sensors. To cancel a user calibration of an NH
3
sensor use “FACT” in the CAL Setup Option.