Rainbow-electronics CAN интерфейс Bedienungsanleitung PDF herunterladen (Seite 46)

BOSCH

ROBERT BOSCH GmbH, Postfach 300240, D-7000 Stuttgart 30

Sep. 1991

Part B - page 44

In order to distinguish between Standard Format and Extended Format the reserved bit

r1 in previous CAN specifications version 1.0-1.2 now is denoted as IDE Bit.

IDENTIFIER

IDENTIFIER -

Standard Format

The IDENTIFIER’s length is 11 bits and corresponds to the Base ID in Extended

Format. These bits are transmitted in the order from ID-28 to ID-18. The least

significant bit is ID-18. The 7 most significant bits (ID-28 - ID-22) must not be all

’recessive’.

IDENTIFIER -

Extended Format

In contrast to the Standard Format the Extended Format consists of 29 bits. The

format comprises two sections:

Base ID with 11 bits and the

Extended ID with 18 bits

11 bit IDENTIFIER

Control

Field

Arbitration Field

Data Field

S

O

F

R

T

R

I

D

E

r

0

DLC

Standard Format

11 bit IDENTIFIER

Control

Field

Arbitration Field

Data Field

S

O

F

S

R

R

I

D

E

r

1

DLC

Extended Format

r

0

R

T

R

18 bit IDENTIFIER

Data Frame

1 2 ... 41 42 43 44 45 46 47 48 49 50 51 ... 71 72

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