Advantech PCI-1682U Manual de usuario descargar pdf (Pagina 64)

PCI-1680U/1682U User Manual 58

Dual Mode

Dual filtering is more complicated than single filtering. In Dual filtering mode, 4 ACRs

and 4 AMRs form two filters; the received information frame could be accepted by

either filter. For Standard frame, filter1 is composed of ACR0, ACR1, AMR0, AMR1

and the lower four bits of ACR3 and AMR3. It corresponds to 20 bits, including 11

identifiers, the RTR bit and the first byte; all of 20 bits are used for the filtering. filter2

is composed of ACR2, AMR2 and the higher four bits of ACR3 and AMR3, while only

11 identifiers and the RTR bit are used for the filtering. For Extended frame, filter1 is

composed of ACR0, ACR1, AMR0 and AMR1, not including ACR3 and AMR3.

What°Øs more, there are only 16 bits out of 29 bits used for the filtering.Filter2 is

composed of ACR2, ACR3, AMR2 and AMR3. The higher 16 bits out of 29 bits are

used for the filtering.

 Example of Standard frame:

Filter1:

In this example, Data1 and RTR are not considered and the accepted ID: 0x1.

Filter2:

In this example, RTR are not considered and the accepted ID: 0x1.

 Example of Extended frame:

Filter1:

In this example, the accepted IDs include: 0x2000(10000000000000),

0x3FFF(11111111111111), etc.

Filter2:

In this example, the accepted IDs include: 0x2000(10000000000000),

0x3FFF(11111111111111), etc.

0 1 3 (lower 4 bits)

ACR 00000000 001XXXXX XXXX

ACM 00000000 00011111 1111

accepted ID(ID.10``ID.0)

00000000 001

2 3 (upper 4 bits)

ACR0-ACR3 00000000 001X

ACM0-ACM3 00000000 0001

accepted ID(ID.10``ID.0) 00000000 001

0 1

ACR 00000000 00000001

ACM 00000000 00000000

accepted ID(ID.28``ID.13) 00000000 00000001

2 3

ACR 00000000 00000001

ACM 00000000 00000000

accepted ID(ID.28``ID.13) 00000000 00000001

1 2 ... 59 60 61 62 63 64 65 66 67 68 69 ... 103 104

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Advantech PCI-1682U Manual de usuario Pagina 64