Defining a post-filter is a little bit more complex than defining a pre-filter. Post-filtering provides a more precise way of filtering. When you choose to post-filter on conditions, two filter condition list areas appear. These two lists have been designed to show all the
information needed by the post-filter.
•the first list looks like the Pre-Filter list and performs almost the same function; it will be referred to as the top list.
•the second list is used to filter on some LPacket data and will be referred to as the bottom list.
TIP You can also access the Post-Filter view from the Actions
menu: Control Panel>Define Pre-Filter.
Click on this radio button to get all stored frames from the Data Buffer.
Click this button to enable any changes in post-filtering. This will update the MAC Frame Data view.
First Post-Filter condition. The “Yes” means LPacket filter is enabled. Enable/disable
filter condition.
Second Post-Filter condition. LPacket filter is enabled. Click on this radio
button to filter on conditions.
4-12 Triggers and Filters
You can add, edit, or delete a post-filter condition in these two list areas by clicking the right mouse button. A pop-up menu appears.
When you add or edit a post-filter in the top list, you see the following dialog box:
TIP Another way you can add, edit, or delete a post-filter condition
is by pressing the Insert, Enter, or Delete key, respectively.
Define the Producer MAC ID(s) you want to filter. You can define: • a single Producer MAC ID (in a range 0-255).
• a group of IDs. Separate the range by a hyphen (2-88). The range can extended from 0 to 255.
• multiple IDs. Separate the IDs by a semi-colon (2;9;27). • a group and multiple IDs (2-7;3;8).
If you do not enter a value in this field, the full range (0-255) becomes the default value.
Enable filter on an LPacket. This enables the bottom post-filter list. You will see a “Yes” in the Filter LPacket column in the Filter/Trigger view.
Disable filter on an LPacket. This disables the bottom post-filter list. You will see a “No” in the Filter LPacket column in the Filter/Trigger view.
TIP For a definition of Status, see page 4-4.
Triggers and Filters 4-13
When you enable LPacket filtering and you want to add or edit frame conditions in the bottom list, you see the following dialog box:
•Size
•Ctrl Bits
•Prod/Cons MAC ID
•Link Data and an Offset
Enter the size of the LPacket header (in hexadecimal).
Define the Producer/Consumer MAC ID(s) you want to filter in each LPacket. • for a Generic LPacket, it is the Producer/Consumer ID.
• for a Fixed LPacket, it is the Destination ID. • for a Broadcast ID, it is 255.
You can define:
• a single Producer/Consumer MAC ID (in a range 0-255). • a group of IDs. Separate the range by a hypen (2-88).
The range can extended from 0 to 255.
• multiple IDs. Separate the IDs by a semi-colon (2;9;27). • a group and multiple IDs (2-7;3;8).
• If you do not enter a value in this field, the full range (0-255) becomes the default value. When Any Tag is selected, you
cannot base your selection on Tag values.
Enter the control bits of the LPacket header (in hexadecimal). The fields reflect the value entered in the Control Bits
field above. See “Interpreting Control Bits,” page 4-16.
Enter the LPacket Link Data Offset (in hexadecimal).
Enter the LPacket Link Data you want to check (in hexadecimal).
IMPORTANT In the preceding example, all the fields have been filled in for
illustration purposes but not all of them are required fields. When Any Tag is checked, only one of the following fields must be filled in:
4-14 Triggers and Filters
When you choose the Fixed Tag option, the Service field appears and you see the following dialog box:
If you don’t enter a value in the Ctrl Bits field, “Fixed” appears in the Control Bits column in the bottom list area of Post-Filter view. If the Ctrl Bitsfield is filled in, the interface checks the consistency with the Fixed Tag option; in the Post-Filter view,
Control Bits field, a hexadecimal value will replace the “Fixed” string. See “Interpreting Control Bits,” page 4-16.
When Fixed Tag is chosen, the Service field appears.
The UCMM Service number is forced at 0x83 when a predefined UCMM Service is selected.
The values in the Offset and Link Data fields are forced when a predefined UCMM Service is selected.
Select a predefined UCMM Service.
IMPORTANT When Fixed Tag is chosen, it is not necessary to fill any fields
because the Fixed Tag option is automatically entered on several bits in the Control Bits field (see the Acc. Always, Tag Pad, and Fixed Screen fields above).
Triggers and Filters 4-15
When you choose the Generic Tag option, the Connection field appears and you see the following dialog box:
If you don’t enter a value in the Ctrl Bits field, “Generic” appears in the Control Bits column in the bottom list area of Post-Filter view. If the Ctrl Bits field is filled in, the interface checks the consistency with the Generic Tag option; in the Post-Filter view,
Control Bits field, a hexadecimal value will replace the “Generic” string. See “Interpreting Control Bits,” on the next page.
IMPORTANT When Generic Tag is chosen, it is not necessary to fill any
fields because the Generic Tag option is automatically entered on several bits in the Control Bits field.
When Generic Tag is chosen, the Connection Number field appears.
Enter the Connection Number in hexadecimal.
4-16 Triggers and Filters