TransCore 05531 User Manual
Encompass 4/4800 Multiprotocol Reader System Guide
7-12
Each time the reader receives a tag ID, it compares the ID with the contents of a com-
parison register. This register contains the following two items:
parison register. This register contains the following two items:
Item 1
Most recently acquired ID
Item 2
Second-most recently acquired ID (if different from item 1)
When the uniqueness filter is set to a separation of one ID, the newly acquired ID is
transmitted only if it is different from item 1. When the uniqueness filter is set to a
separation of two IDs, the reader transmits the newly acquired ID only if it is different
from both items 1 and 2.
transmitted only if it is different from item 1. When the uniqueness filter is set to a
separation of two IDs, the reader transmits the newly acquired ID only if it is different
from both items 1 and 2.
Note: A new ID can fail the filter test and not be transmitted; however, it remains
stored in the comparison register.
stored in the comparison register.
The uniqueness test has a two-minute time limit. If an ID is buffered, it will not be
accepted again unless it arrives at the reader more than two minutes from the previous
arrival or until the receipt of one or more other IDs reset the uniqueness.
accepted again unless it arrives at the reader more than two minutes from the previous
arrival or until the receipt of one or more other IDs reset the uniqueness.
Note: The Encompass 4/4800 Multiprotocol Reader System does not include a real-
time clock. The dual-protocol Encompass 4/4800 Multiprotocol Reader internal tim-
ing varies depending on the operative tag read mode and the type of tag in the read
field.
time clock. The dual-protocol Encompass 4/4800 Multiprotocol Reader internal tim-
ing varies depending on the operative tag read mode and the type of tag in the read
field.
Reader response:
Done
43 Buffer All ID Codes
Command 43 buffers all acquired ID codes. It effectively cancels any uniqueness
criteria previously set by select unique ID code criteria command 410N.
criteria previously set by select unique ID code criteria command 410N.
Note: Command 43 is for diagnostic purposes only.
After diagnostics are complete, reset the select unique ID code criteria using
command 410N.
command 410N.
Reader response:
Done
Table 7-6 Unique ID Code Criteria
Command
Uniqueness Criteria
4100
Separation of 1 ID (factory default)
4101
Separation of 2 IDs