TransCore MPRX, System Manual

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User Guide
TransCore Proprietary 7–12
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420N Select Valid ID Code Criteria
Command
#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 7 – 7 ).
The factory setting is one acquisition (N = 0).
Table 7 – 7 Select Valid Code Commands and Frames
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
Command 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
#443 30 seconds
Entering these commands effectively expires the timeout clock, which erases all current
IDs in the comparison register. In effect, the first ID that is acquired after the clock expires
Command Valid Code Frames
4200 1 (factory default)
4201 2
4202 3
4203 4