Rainbow Electronics CAN интерфейс - Manual (Page 17)

BOSCH
ROBERT BOSCH GmbH, Postfach 50, D-7000 Stuttgart 1
Sep. 1991
Part A - page 15
3.1.2 REMOTE FRAME
A station acting as a RECEIVER for certain data can initiate the transmission of the
respective data by its source node by sending a REMOTE FRAME.
A REMOTE FRAME is composed of six different bit fields:
START OF FRAME, ARBITRATION FIELD, CONTROL FIELD, CRC FIELD, ACK
FIELD, END OF FRAME.
Contrary to DATA FRAMEs, the RTR bit of REMOTE FRAMEs is ’recessive’. There is
no DATA FIELD, independent of the values of the DATA LENGTH CODE which may
be signed any value within the admissible range 0...8. The value is the DATA LENGTH
CODE of the corresponding DATA FRAME.
The polarity of the RTR bit indicates whether a transmitted frame is a DATA FRAME
(RTR bit ’dominant’) or a REMOTE FRAME (RTR bit ’recessive’).
Inter
Space
Inter
Space
Start of Frame
Arbitration Field
Control Field
CRC Field
ACK Field
End of Frame
or
Overload
Frame
REMOTE FRAME
Frame Frame
Remote Frame