Setting
RFID channels — overview of commands
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07.00 | 2022/09 | 116
8.8.3 Command: Read
The Read command causes the read/write device to read the data of tags in the detection
range. 128 bytes are transferred in a read operation by default. Larger data volumes can be
transferred in fragments. If a particular UID or EPC is entered, the read/write device only reads
the appropriate tags. All other tags in the detection range are ignored in this case.
NOTE
The command code for fast processing with the loop counter is 0x2002 (hex.) or
8194 (dec.).
See description of the output data, p. [}105].
Request
Loop counter See description of the output data
Command code 0x0002 (hex.), 2 (dec.)
Memory area See description of the output data
Read/write head address See description of the output data
Length UID/EPC Enter UID or EPC size in bytes, if a particular tag is to be read.
The UID or EPC must be defined in the write data (start byte:
0). The function of the UID/EPC length is dependent on the
command used.
0: No entry of a UID/EPC for executing the command. Only
one tag can be located in the detection range of the read/
write device.
> 0: EPC length of the tag to be read if an EPC is present in
the write data
-1: NEXT mode: A tag is always only read if the UID/EPC is
different to the UID/EPC of the last read or written tag.
Start address Start address of the memory area on the tag to be read
(entry in bytes)
Length Length of the data to be read in bytes
Timeout See description of the output data
Write fragment No. 0
Read fragment No. See description of the output data
Write data,
Byte 0…(size of the UID/EPC - 1)
UID or EPC of the tag to be read
Write data,
Byte (size of the EPC)…127
Not required
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