Operation
HF applications – using HF Continuous bus mode
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9.5
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 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 start address must be a multiple of the block size of the tag used.
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 is still stored in the FIFO memory of the module, a UID 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 the 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 activ-
ated)