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5.2 Reader operation principles
Most of the reader commands are executed in a synchronous manner. This
means that the reader waits for an incoming request from the host, executes the
associated operation then sends a reply containing operation execution status
back to the host. Between the reception of two consecutive commands, the
reader does nothing but wait for the next command.
The following commands are examples of commands executed in a synchronous
manner:
●
Configuration commands (configuring the TCP/IP stack, for example).
●
Tag writing commands (writing an ISO15693 tag memory block, for
example).
●
Most tag reading commands (reading the locking status of an ISO15693 tag
memory block, for example).
Synchronous commands that actually perform an operation on tags in the RF
field (such as a writing operation, opposed to a configuration command) can only
use a single channel (multiplexer cannot be used). The channel and RF power
that should be used for any subsequent synchronous tag operation is called the
default RF configuration (specific commands exist to get/set this configuration).
An exception to the mechanism described above exists: the asynchronous read (or
default read).
