The user interface 65
imc CANSAS Users Manual - Doc. Version 1.9 - 05.12.2014© 2014 imc Meßsysteme GmbH
3.2.4.4 CAN-Bus message
The dialog on this index card is used to define the properties of a CAN-Bus message.
CAN-Bus message Properties dialog
Name: A unique name by which to differentiate among various messages. As the default, the system
suggests _i as the name of a new message, where i stands for the next number not yet used. There are
only these limitations to the possibilities for the name:
there must be a name,
the name may not contain certain characters. All alphanumeric characters and the characters _ ~
are allowed. The first character may not be a digit,
the name must be unique within the imc CANSAS module,
the name may contain no more than 64 characters.
Comment: An accompanying text about the message; could be used to explain in detail the message
name, or for any other notes.
Message identifier: The identifier gives an unequivocal statement of the source and interpretation of
data. No two messages of a single module may have the same identifier. The identifier thus determines
the priority of sending a message; equal priorities are not allowed. If two messages are simultaneously
slated to transmit, the message with the lower-number identifier is sent first. Two messages from
different imc CANSAS-modules may take the same identifier as long as the modules are not connected to
the same CAN-Bus. Values which an identifier may take are: 0.. 2047 (Standard-format), 0.. 536870912
(Extended-format).
The identifier can also be defined in hexadecimal format. Append either "h" or "H" to the hexadecimal
number, or prefix it with "0x" (e.g. 2ACH, e4h or 0xAC, 0xe4).
Message length: Number of bytes in a message; 1 to 8 bytes are possible. The message length is
determined by the channels assigned to it. Only complete bytes can be sent in a message, therefore it is
possible that not all bits in a transmitted byte actually contain information from a channel.
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