Operation
HF applications — using HF Continuous Bus Mode
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07.00 | 2022/09 | 224
9.6 HF applications — using HF Continuous Bus Mode
In HF Continuous Mode the read/write head can read or write up to 64 bytes (see the table for
user data areas of the HF tags).
The following parameters must be set in Continuous Mode:
n Tag type
n Command in Continuous Mode
n Length in Continuous Mode
n Start address for the command in Continuous Mode
n Optional: Start address in the process output data for activating the grouping
With read or write command: Enter the tag type. Automatic tag detection is not possible.
Select the command in Continuous Mode (CCM): Inventory, read, tag info and write are
possible.
Enter the length in Continuous Mode (LCM): Enter the length of the data to be read in
bytes. The length must be a multiple of the block size of the tag used. Odd bytes cannot
be addressed.
Enter the start address for the command in Continuous Mode (ACM). The start address
must be a multiple of the block size of the tag used. Refer to the table below for the block
size of the tags. Odd bytes cannot be addressed.
Set the grouping function via the Start address in the process output data parameter if
required: Set the value for the Start address parameter to 1. If the grouping function is
activated and a UID or user data is still stored in the FIFO memory of the module, a UID or
the same user data after the first read is no longer stored as a new read. With subsequent
read operations only the address of the read/write head that has last read the tag and the
number of read operations is updated.
For a write command enter the data to be written in the write data area.
Execute the Continuous Mode command.
a The set command is preloaded and carried out for all active read/write heads as soon as a
tag is in the field.
With the read command and when querying UIDs, the data received by the read/write
head is polled cyclically and stored in the FIFO memory of the interface:
Type Name Meaning
uint8_t data[8] uint8_t UID [8]
uint8_t Reserved
uint8_t Address Read/write head address
uint16_t Number of read operations (only if grouping is
activated)
Execute the Idle command (0x0000). The Idle command does not stop Continuous Mode.
To pass on data from the FIFO memory of the interface to the controller, execute the
Read buffer (Cont. Mode) command (0x0011). The address of the read/write head used
is also transferred in addition to the read data. The length of the available data in the
FIFO memory is displayed in the input data at Data (bytes) available (BYFI). The length of
the data must be consistent. Example: If UID, reserved byte and read/write head address
are written to the FIFO memory for each tag, at least 10 bytes of data must be read from
the buffer.
NOTE
Data in the FIFO memory is not overwritten until it was transferred to the controller.
New read operations are appended in the FIFO memory of the interface.
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