TransCore MPRX Series - Table 18 Select Valid Code Commands and Frames

Separation of three and four IDs transmit the new ID only if it is dierent from the first
three and the first four items, respectively.
Note: A new ID can fail the filter test and not be transmitted; however, it remains stored in the
comparison register.
The uniqueness test has a time limit as set by Command #44N. If an ID is buered,
it will not be accepted again unless it arrives at the reader more than the timeout
value from the previous arrival or until the receipt of one or more other IDs reset the
uniqueness.
Reader response: #Done
420N Select Valid ID Code Criteria
#420N directs the reader to validate an ID received only after it has been obtained a specified
number of times in sequence. Values for N are 1 through 4 (Table 18). The factory setting
is one acquisition (N = 0).
Table 18 Select Valid Code Commands and Frames
Command Valid Code Frames
4200
1 (factory default)
4201
2
4202
3
4203
4
The validation procedure is executed before the unique ID test (Select Unique ID Code
Criteria [#410N] Commands). IDs that do not pass the validation test are not reported.
For example, Command #4203 specifies that the same ID must be obtained from the
antenna/RF module 4 times in succession before it is considered for the uniqueness
test. This feature is useful in installations where RF reflections may cause a single tag to
be read multiple times or where an occasional ID might be read from fringe areas.
440 Reset Uniqueness
#440 causes the ID filtering process set by Select Unique ID Code Criteria (#410N) to
restart. It is used in conjunction with the Set Uniqueness Timeout (#44N) Commands.
This command provides a one-time reset at which point the previously set timeout
interval resumes. This command can be sent in data or command mode.
44N Set Uniqueness Timeout
Places a time limit on the uniqueness criterion set by Select Unique ID Code Criteria (#410N). The
parameter N sets the number of minutes on the timeout clock. The factory setting is two minutes (N = 1).
Command Timeout Clock
#441 2 minutes (factory setting)
#442 15 seconds
MPRX User Guide
TransCore Proprietary
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