Setting
RFID channels — overview of commands
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8.8.11 Command: UHF Continuous Presence Sensing Mode
In Continuous Presence Sensing Mode, a user-defined command (Write, Read, Inventory) can
be sent to the UHF reader and saved there. In Continuous Presence Sensing Mode, the readers
are automatically switched on as soon as a tag is located in the detection range. The duration of
the scan interval and the on time can be adjusted in the settings of the UHF reader. The com-
mand is continuously executed until the user terminates Continuous Presence Sensing Mode
by executing a reset command.
NOTE
The reset command resets all read data.
Readers in Continuous Presence mode send all command related data to the interface. The
data is stored in the FIFO memory of the interface and can be queried by the controller via the
Read buffer (Cont. mode) command. In Continuous Presence Sensing Mode the Tag in detec-
tion range signal is not permanently updated.
See description of the output data, p. [}105].
Request
Loop counter See description of the output data
Command code 0x0020 (hex.), 32 (dec.)
Read/write head address See description of the output data
Length UID/EPC Not required
Start address 0: Grouping inactive
1: Grouping active
>1: not defined
Length Not required
Timeout Not required
Write fragment No. 0
Read fragment No. See description of the output data
Write data Not required
See description of the input data, p. [}100].
Response
Loop counter See description of the input data
Response code 0x0020 (hex.), 32 (dec.)
Length Not required
Error code See description of the input data
Tag in
detection range
See description of the input data
Data (bytes) available Increases during command execution
Tag counter Increases with each read or written UID/EPC
Write fragment No. 0
Read fragment No. See description of the input data
Read data See description of the input data
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