TransCore encompass 4, Руководство пользователя

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Encompass 4 Reader System Guide
TransCore Proprietary.
7–94
Command Group 4 – ID Filtering
Group 4 commands set criteria for filtering (buffering or discarding) ID codes. These commands are useful
for eliminating duplicate ID codes and selecting the type of tags read by the Encompass 4 Reader.
40 Transmit All ID Codes
See also “530 Display RF0 Filter Status” on page 7–109.
Command #40 instructs the reader to transmit all IDs without regard for uniqueness. This command can
be useful when tuning the lane and mapping the footprint or performing diagnostics.
In Diagnostics Mode (
#40
),
#621
still causes the output to go active once for a valid, unique ID “Scroll
Mode.” Refer to “621 Select Predefined Output Control (Factory Default)” on page 7–116.
After diagnostics are complete, you may want to reinstate the uniqueness check using command “410N
Select Unique ID Code Criteria (Anti-passback Feature)” on page 7–81 . This setting will be stored upon
entering
#00
and will be retained over the power cycle. Refer to “00 Switch to Data Mode (Factory
Default)” on page 7–75 .
For operation using the Cypress Converter, use #40 diagnostics “scroll mode.”
Reader response:
Done
410N Select Unique ID Code Criteria (Anti-passback Feature)
See “530 Display RF0 Filter Status” on page 7–109, “440 Reset Uniqueness” on page 7–95, and “44N
Set Uniqueness Timeout” on page 7–96.
Command
#410N
instructs the reader to buffer and transmit ID codes according to the following test:
an ID is read if previously decoded IDs have changed value at least
N
+1 times since the new ID was last
received. IDs that do not pass the test are not read. The factory-default setting is command
#4100
, which
selects a separation of one ID. Variable
N
specifies ID separation as shown in Table 22.
Table 22 Unique ID Code Criteria
Command Uniqueness Criteria
4100 Separation of 1 ID (factory default)
4101 Separation of 2 IDs
4102 Separation of 3 IDs
4103 Separation of 4 IDs
Each time the reader receives a tag ID, it compares the ID with the contents of a comparison register. This
register contains the following two items:
Item 1 Most recently acquired ID
Item 2 Second-most recently acquired ID