Can Bus; Can Bus Trivia - Bosch DISBLAY DDU 7 Manual

9 | CAN Bus

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9 CAN Bus
DDU 7 has two fully configurable CAN buses.
▪ Baudrate (125 kBaud ... 1 MBaud)
▪ 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 configura‐
tion.
▪ Output configuration: Write DDU 7 measurement variables to CAN messages,
output frequency and row counter are configurable, CAN gateway function‐
ality (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 bus data rate in 'Properties' menu by double click on the
CAN bus in project tree (1 MBaud, 500 kBaud, 250 kBaud, 125 kBaud).
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
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