3.1.4How to set the Acceptance Code and Mask

Acceptance Code (AC): The CAN ID bits that you want to get.

Acceptance Mask (AM): The CAN ID bits that you want to filter.

In the acceptance code, the bit value ‘1’ means that you want to get this CAN ID bit. And in the acceptance mask, the bit value ‘0‘ means that you want to filter this CAN ID bit.

For 11-bit ID Message:

Register

bits of register

Filter Target

 

 

 

AccCode[0] and AccMask[0]

bit7~bit0

bit10 ~ bit3 of ID

 

 

 

AccCode[1] and AccMask[1]

bit7~bit5

bit2 ~ bit0 of ID

 

 

 

AccCode[1] and AccMask[1]

bit4

RTR

 

 

 

AccCode[1] and AccMask[1]

bit3~bit0

no use

 

 

 

AccCode[2] and AccMask[2]

bit7~bit0

bit7 ~ bit0 of 1st byte data

 

 

 

AccCode[3] and AccMask[3]

bit7~bit0

bit7 ~ bit0 of 2nd byte data

 

 

 

For 29-bit ID Message:

 

 

 

 

 

Register

bits of register

Filter Target

 

 

 

AccCode[0] and AccMask[0]

bit7~bit0

bit28 ~ bit21 of ID

 

 

 

AccCode[1] and AccMask[1]

bit7~bit0

bit20 ~ bit13 of ID

 

 

 

AccCode[2] and AccMask[2]

bit7~bit0

bit12 ~ bit5 of ID

 

 

 

AccCode[3] and AccMask[3]

bit7~bit3

bit4 ~ bit0 of ID

 

 

 

AccCode[3] and AccMask[3]

bit2

RTR

 

 

 

AccCode[3] and AccMask[3]

bit1~bit0

no use

 

 

 

i-7540D CAN-Ethernet Gateway User’s Manual (Version 1.4, April/2008)

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ICP DAS USA I-7540D user manual How to set the Acceptance Code and Mask, Rtr

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