TransCore 0596465PT90 用户手册

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. 

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 per-
forming diagnostics.

After diagnostics are complete, you may want to reinstate the uniqueness check using 
command #410N Select Unique ID Code Criteria.

Reader response:

Done

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 

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 com-
parison register. This register contains the following two items:

Item 1

Most recently acquired ID

Item 2

Second-most recently acquired ID

Item 3

Third-most recently acquired ID

Item 4

Fourth-most recently acquired ID

When the uniqueness filter is set to separation of one ID, the newly acquired ID is 
transmitted only if it is different from the first item. Separation of two IDs allows 
transmission if the new ID is different from Items 1 and 2 in the comparison register. 
Separation of three and four IDs transmit the new ID only if it is different from the