User's Manual

Table Of Contents
Product Manual - RFID Reader LF60C SoliD 68
Chapter 7
Operation
Block transfer
protocol
The drawing below illustrates some simple message interactions between the host
and the equipment. The figure shows the possible handshake sequence to acquire
the status of the equipment.
When the host wants to send, it first sends an <ENQ> and then tries to read.
If it receives an <EOT>, it sends its message and then expects an <ACK>.
If it receives an <ENQ>, it puts off sending its message, sends an <EOT> and
then reads the other message.
When both the host and the equipment try to send at the same time, the host
must cancel its inquiry because the host is working in slave mode. It must first
receive the equipment message because the reader is the master. Only then can
the host send its message.
For more detailed information about all possible cases, see SEMI E4.
(SEMI Equipment Communication Standard 1 Message Transfer SECS-I)