IMC CANSAS - Operation Modes; Default Operation Type

316 Properties of the Modules
imc CANSAS Users Manual - Doc. Version 1.9 - 05.12.2014© 2014 imc Meßsysteme GmbH
6.11.3 Operation modes
6.11.3.1 Default operation type
The ignition angle is stated in degrees before TDC (Top Dead Center). If the angle is positive, then it is
before TDC. If it is negative, then it is after the TDC. The ignition angle is limited to the range -180 degrees
.. +180 degrees; narrower (configured) limits can apply.
The RPMs are determined by finding the time for one full revolution. In the process, the rotation speed
fluctuations within a revolution, which are typical of combustion engines, are not considered. Instead,
the value is stabile and representative.
6.11.3.1.1 Message
In default operation mode, the module cyclically sends messages on the CAN-Bus. The clock rate and the
CAN-identifier are software-configurable. The message content for Intel-Byte-syntax:
Signal
Start bit
Start byte
Bit count
Integer
Offset
Scaling factor
Ignition angle
0
0
16
signed
0.0
0.01 degree / LSB
RPMs
0
2
16
unsigned
0.0
0.5 RPM / LSB
If the ignition angle can not be determined or it is invalid, the value 8000H = -32768 is entered in the
message for the ignition angle.
If the RPMs are less than the permitted (configured) range, or cannot be determined, the value 0 is
entered for the RPMs.
If the RPMs are higher than the permitted (configured) range, the value FFFFH = 65535 is entered in the
message for the RPMs.
If Monitoring of selected cylinders is used, the module additionally sends one message on the CAN-Bus
per monitored cylinder. The CAN-identifier can be software-configured. The clock rate is the same as for
the message described above. Message content with the Intel byte order:
Signal
Start bit
Start byte
Bit count
Integer
Offset
Scaling factor
Ignition angle AVG
0
0
16
signed
0.0
0.01 Degrees / LSB
Ignition angle Min
0
2
16
signed
0.0
0.01 Degrees / LSB
Ignition angle Max
0
4
16
signed
0.0
0.01 Degrees / LSB
If the ignition angle can not be determined or it is invalid, the value 8000H = -32768 is entered in the
message for the ignition angle AVG, Min, Max.
Note
Using the menu item "File / Export..." , it is possible to generate a .dbc or .cba file containing the
scaling information in the respective format.