turck TBEN-L4-4RFID-8DXP, Instructions For Use Manual, Page: 110 / 242

Setting
RFID channels – overview of commands
110
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Response (UHF)
Loop counter See description of the input data, [ } 93]
Response code 0x0001 (hex.), 1 (dec.)
Length Length of the read data
Error code See description of the input data, [ } 93]
Tag within the
detection range See description of the input data, [
}
93]
Data (bytes) available See description of the input data, [ } 93]
Tag counter Ascending
Write fragment no. 0
Read fragment no. See description of the input data, [
}
93]
Read data, Bytes 0…n See example: UHF read data
Data format in UHF applications
The UHF read data is formatted by means of a header. The header has the following structure:
Type Name Meaning
uint8_t Size Data size
uint8_t Block type 1: UID/EPC/RSSI etc.
2: Read data
other values : reserved
uint8_t Data [size] EPC/RSSI etc. or read data
The size of EPC/RSSI etc. depends on the settings of the read/write head.
Reading out the RSSI value
The RSSI value is output in binary code in 2 bytes and corresponds to the two's complement of
the output binary code. Mapped to a signed integer, the 2 bytes output correspond to ten
times the actual RSSI value. Refer to the following table for an example of the RSSI value:
MSB…LSB
(decimal) MSB…LSB
(binary) Two’s complement RSSI (dBm)
252 253 11111100 11111101 -771 -77.1