User's Manual

Product Manual - RFID Reader LF60C SoliD 76
Chapter 7
Operation
7.4.5 SECS-II implementation
Introduction The SEMI Equipment Communication Standard Part 2 (SECS-II) defines how
messages exchanged between intelligent equipment and a host are interpreted.
It is the intent of this standard to be fully compatible with SEMI Equipment
Communication Standard E4 (SECS-I).
The messages defined in this specification support the typical activities required
for the BROOKS transponder reader.
SECS-II gives form and meaning to messages exchanged between the equipment
and the host using a message transfer protocol, such as SECS-I. SECS-II defines
the method of conveying information between the equipment and the host in the
form of messages.
These messages are organized into categories of activities, called streams, which
contain specific messages, called functions. In SECS-II, messages are identified
by a stream code (0-127, 7 bits) and a function code (0-255, 8 bits). Each
combination of stream and function represents a unique message identification.
SECS-II defines the structure of messages into entities called items and lists of
items. These data structures define the logical divisions of the message as
distinct from the physical division of the message transfer protocol.
An item is an information packet that has a length and format defined by the first
2, 3 or 4 bytes of the item. These bytes are called the item header. The item
header consists of the format byte and the length byte as shown below.