HERMOS AG
Gartenstraße 19 • 95490 Mistelgau
Phone: +49 9279 991 - 0
LFM 4x Reader Rev1.4
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80
Customer manual
LFM 4x Reader
RFID
WE GENERATE SOLUTIONS
Lower Device-ID (Gateway-ID)
0
0
0
0
0
0
0
0
Direction reading device to host
0x8000
Direction host to system (reading device)
0x0000
The W bit indicates whether the transmitter of the primary message wait for a reply. If the W bit
contains the value 1, it means that a reply is expected.
The message ID determines the format and the content of the transmitted message. It consists
of a stream and a function. The stream defines the message group and the function, the exact
meaning and the syntax of the message. A primary message (request) is defined as an
uneven message. A secondary message is defined as an even message (reply).
The end bit indicates whether a block is the last block of the message. A value of 1 means
that the block is the last block. Since all messages can be transmitted in a block, the block
number always has the value 1.
The system bytes in the header of each message are used to distinguish primary messages.
The system bytes of the reply message must correspond to the system bytes of the
corresponding primary message. The system bytes are incremented for each primary
message.
The checksum is calculated as the numerical sum of the unsigned binary values of all bytes
–
after the length byte and before the checksum as well as in an individual block.
For more detailed information about the structure and transmission procedure, see SEMI E4,
E5, E37, E99.
(SEMI Equipment Communication Standard Message Transfer SECS)
