turck TN-UHF AUS-CDS Series, Instructions For Use Manual

Page: 161 / 225

V02.00 | 2020/08
161
8.5.2 Command: Inventory
The Inventory command causes the read/write head to search for tags in the detection range
and read the EPC or RSSI of the tag if activated in the UHF read/write head. The inventory
command can be executed in single-tag mode and in Multi-tag mode.
NOTE
The command code for fast processing with the loop counter is 0x2001 (hex.) or
8193 (dec.).
Request
Loop counter See description of the output data, [
}
156]
Command code 0x0001 (hex.), 1 (dec.)
Read/write head address See description of the output data, [ } 156]
Length of EPC Not required
Start address 1: Grouping of the EPCs active
0: Grouping of the EPCs inactive
Length 0: Transfer the actual length (bytes) of the transferred EPC
during an inventory operation.
> 0 : EPC completely output.
Command timeout See description of the output data, [
}
156]
Write fragment no. 0
Read fragment no. See description of the output data, [ } 156]
Write data Not required
Response
Loop counter See description of the input data, [ } 152]
Response code 0x0001 (hex.), 1 (dec.)
Length Length of the read data
Error code See description of the input data, [ } 152]
Tag within the
detection range See description of the input data, [ } 152]
Data (bytes) available See description of the input data, [ } 152]
Tag counter Ascending
Write fragment no. 0
Read fragment no. See description of the input data, [ } 152]
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: EPC etc.
Other values: Reserved
uint8_t Data [size] EPC and read data
The size of EPC/RSSI etc. depends on the settings of the read/write head.