Setting
RFID channels — overview of commands
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07.00 | 2022/09 | 114
Response (UHF)
Loop counter See description of the input data
Response code 0x0001 (hex.), 1 (dec.)
Length Length of the read data
Error code See description of the input data
Tag in
detection range
See description of the input data
Data (bytes) available See description of the input data
Tag counter Ascending
Write fragment No. 0
Read fragment No. See description of the input data
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 reader.
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
Example: UHF read data (header and EPC, grouping deactivated)
Type Name Meaning
uint8_t Size 12
uint8_t Block type 1
uint8_t Data [14] uint8_t EPC [12]
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