Setting
RFID channels — process input data
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07.00 | 2022/09 | 101
Designation Meaning
Data (bytes) available (BYFI)
(available with HF Advanced and
UHF Advanced only)
Shows the number of bytes in the FIFO memory of the interface.
Ascending: new data read by a tag or received by the device
Descending: command execution completed
Fault signal 0xFFFF: memory overfilled, risk of loss of new data
Read fragment No. (RFN)
(available with HF Advanced and
UHF Advanced only)
If the data to be read exceeds the size of the read data memory, the data is split
into max. 256 fragments. The fragments are numbered consecutively from 1 to
255. From fragment number 256, numbering begins again at 1. The sending of a
fragment is confirmed by the device if the read fragment No. appears in the
process input data. After the confirmation, the next fragment is read.
0: No fragmentation
In idle mode, the size of the fragments is specified. When a read command is
issued, the current fragment number of the read data is indicated.
Write fragment No. (WFN) If the data that is to be written exceeds the size of the write data memory, the
data is split into max. 256 fragments. The fragments are numbered consecutively
from 1 to 255. From fragment number 256, numbering begins again at 1.
The sending of a fragment is confirmed by the device if the write fragment No.
appears in the process input data. Following confirmation, the next fragment is
written.
0: No fragmentation
In idle mode, the size of the fragments is specified. When a write command is
issued, the current fragment number of the written data is indicated.
TP1…TP32 Tag in the detection range of the connected read/write head (available in HF bus
mode only)
Read data User-defined read data
8.2.2 Tag in detection range (TP) — using bit or pre-loading the command
The Tag in detection range bit is set automatically if a read/write device detects a tag.
Apart from with some variants of Continuous Mode, the bit in HF applications is set by default
in all operation modes as well as in idle mode.
All commands can be sent irrespective of whether the Tag in detection range bit (TP) is set. If
no tag is present in the detection range when the command is sent, the command is executed
by a rising edge at TP. A command is executed immediately if there is a tag in the detection
range at the time of sending.
NOTE
If the HF read/write head detects a new tag in the detection range, the Tag present
bit (TP) and the data (UID and/or read data) are set via the HF: Idle mode (UID and/
or read data) are displayed simultaneously. If two tags are detected in quick succes-
sion, the TP bit may remain set. The data of the second tag (UID and/or read data) is
displayed.
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