HMS Networks Ixxat CAN-Gateway Configurator V6 User Manual page 40

CAN-Gateway Configurator V6 for CAN@net NT and CANbridge NT
• binary positions with value 1 are relevant for the filter
• binary positions with value 0 are not relevant for the filter
Binary representation of value:
• Defines the values for the positions that are marked as relevant (1) in mask.
• Values in positions that are marked as not relevant (0) in mask are ignored.
The following formula expresses the condition under which an identifier passes the filter:
• if (value & mask) == (identifier & mask) then identifier is valid
Table 4. Example 11 Bit Identifier
hex
Value 0x100
Mask 0x700
Result 0x1XX
Any identifier between 0x100 and 0x1FF passes the filter, as only the first 3 bits of the mask are marked as
relevant.
Table 5. Example 29 Bit Identifier
hex
Value 0x10003344
Mask 0x1F00FFFF
Result 0x10003344
All identifiers with 0x10xx3344 (positions xx can be any number) pass the filter.
Table 6. Mask/Value Filter
Value Mask
0x100 0x7FF
0x100 0x700
0x000 0x000
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bin
0001:0000:0000
0111:0000:0000
0001:XXXX:XXXX
bin
0001:0000:0000:0000:0011:0011:0100:0100
0001:1111:0000:0000:1111:1111:1111:1111
0001:0000:XXXX:XXXX:0011:0011:0100:0100
Valid message identifiers which pass the filter
0x100
0x100–0x1FF
0x000–0x7FF
Mapping Table
4.02.0332.20001 Version 1.7