HID Global Corporation 5553 사용자 설명서
HF Multi ISO RFID Reader User Manual, Firmware V1.4
1508-USM-00-0-04
2.3.1.2.6
LED activity
The LED stays green as long as a tag was found and goes dark if the tag is removed from the
field.
field.
2.3.1.3
DeSelect Wait
This command gives the earliest possible indication that a specified tag has been removed from
the field
the field
Command
Data
'dc'
Timeout byte, Persistence byte, UID
Answer
Answer
Description
UID
'N'
'N'
Specified UID – the tag is still present after the timeout
The specified tag is no longer in the field
The specified tag is no longer in the field
Example
Answer
Description
Command
dc 32 00 04 22 0F 71 4B 1C 80
04 22 0F 71 4B 1C 80
Specified tag still present
dc 32 01 04 22 0F 71 4B 1C 80
‘N’
Specified tag no longer present
2.3.1.3.1
Timeout
This byte specifies the time the reader will check for the (specified) tag being removed from the
field. The actual timeout (in mS) is 4 x the Timeout byte, giving a range of 4 – 1000mS. In
practice, the granularity of the actual timeout is affected by the Command Guard Time, so an
accuracy of +/- 5% is achievable.
field. The actual timeout (in mS) is 4 x the Timeout byte, giving a range of 4 – 1000mS. In
practice, the granularity of the actual timeout is affected by the Command Guard Time, so an
accuracy of +/- 5% is achievable.
If the tag is detected as no longer present before the timeout has been reached, the command
immediately returns ‘N’.
immediately returns ‘N’.
2.3.1.3.2
Persistence
This parameter specifies the number of times the reader checks that the tag really has been
removed from the field – an ‘anti-glitch’ measure. A values of 0 is treated as if it were ‘1’. For each
integer value greater than 1, the basic test loop is repeated, adding approximately 6mS to the
timeout period.
removed from the field – an ‘anti-glitch’ measure. A values of 0 is treated as if it were ‘1’. For each
integer value greater than 1, the basic test loop is repeated, adding approximately 6mS to the
timeout period.
2.3.1.3.3
UID
This is the UID of the tag the reader is checking. It may be 4, 7 or 10 bytes
August 2010
Page 41 of 144
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