User's Manual

5 OPERATION

HF5x Transponder Reader (SECS1-Protocol), Release 1.4

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 works in slave mode.

First, it must receive the equipment message because the reader is the

master. After that the host can send its message.

For more detailed information about all possible cases, see SEMI E4.

(SEMI Equipment Communication Standard 1 Message Transfer

SECS-1)

(

HOST / READER)

(READER / HOST)

Checksum

Data

Header

Length

ENQ

EOT

ACK

T4 (multi-block)

Source: Receiver: