Bosch DDU 7, Manual

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64 en | CAN Bus Display Unit DDU 7
04.02.2019 | V 02 | Manual Bosch Motorsport
9 CAN Bus
DDU 7 has two fully configurable CAN buses.
–
Baudrate (125 kBit to 1 MBit)
– 11 Bit or 29 Bit identifiers
– Input configuration: Read messages from CAN bus and convert to DDU 7 measurement/
display variables. CAN bus supports row counter configuration.
– Output configuration: Write DDU 7 measurement variables to CAN messages, output
frequency and row counter are configurable, CAN gateway functionality (transfer from
one bus to the other)
9.1 CAN bus trivia
CAN message
– 11 Bit (standard) or 29 Bit (extended) identifier
– Up to 8 bytes of data payload
CAN bus
– Needs termination resistors (120 Ohm) in wiring harness
– All devices connected to the bus must use identical data rate
Configuration of DDU 7 bus data rate by double click on the CAN bus in project tree (1
MBaud, 500 kBit, 250 kBit, 125 kBit)
Row counter concept
– Re-use (multiplex) of message identifiers
– One byte of message contains row counter
– 7 bytes payload remaining
– Position of row counter is configurable
Payload Area
Row
Counter
Row
Counter Payload Area
Message
Id