User´s Manual - I+ME ACTIA GmbH

Engineering
Note: The Signal (Data) Type Engineering is also known as Signed Floating Point (SFP).
CAT allows the user to edit or remove already existing Signals assigned to Frames. The user can also
create new Signals using CAT.
CAT can recognize eight different types of signals and allows different formats. To edit or create an
Engineering Signal open the Signal Definition window shown below.
Note: If you edit a diagnostic signal assigned to a DPID you see
DPID: instead of Frame: and Byte is default '1'.
Format
An Engineering Signal has always the format Float.
Position in the Frame
Byte: Describes which Data Byte of the frame is the first one used for this signal. (Starting Byte) Bytes are
counted upwards:
Note: Byte 7 cannot be the starting byte of an Engineering signal cause it always
contains 4 Byte of data. So 4 is the highest Byte No. you must choose.
Bit: Describes which Bit of the chosen Data Byte is the first one used for this signal. (Starting Bit) Bits are
counted downwards:
Bit 7 means the complete 8 Bits (7 – 0) of the chosen Byte will be used.
Bit 0 would mean to use only Bit 0 of the Byte and then to use Bit 7, 6, ... of the following Byte.
Length: Describes the absolute Length of the signal.
For Engineering signals the length is always 32 Bits (4 Byte).
See also Data Byte/Bit presentation on the CAN bus.
Note: For DPID signals Byte 0 is already used. So the selectable starting bytes are Byte 1 to 7.
Embedded ID
89