User´s Manual - I+ME ACTIA GmbH

Packed Binary Coded Decimal
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 furthermore often different formats. To
edit or create a Packed Binary Coded Decimal 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
A Packed Binary Coded Decimal Signal has always the format BCD.
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:
Byte 0 means the signal could be maximal 8 Byte long
Byte 7 would mean that the signal must fit into this single (last) Byte.
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 a packed BCD signal the length is always a multiple of one Byte. (Up to 8 Bytes possible)
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 and
the maximal length is 7 Bytes.
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