HERMOS AG
Gartenstraße 19 • 95490 Mistelgau
Phone: +49 9279 991 - 0
LFM 4x Reader Rev1.4
back to the table of contents
78
Customer manual
LFM 4x Reader
RFID
WE GENERATE SOLUTIONS
11.SECS / HSMS Communications protocol
The SECS I standard defines a communication interface that is suitable for exchanging
messages between the semiconductor processing systems and a host. A host is a computer or
computer network that exchanges the information with the systems to carry out the production.
The standard does not define the data contained in the message. The meaning of the
messages must be defined by a standard that defines the message content
– e.g. by the SEMI
Equipment Communications Standard E5 (SECS-II).
This message record describes the communication between a reading device with SECS-I and
a host. The host and the RFID reading device can communicate via a RS232 interface (SECS-I)
or an Ethernet interface (10/100BaseT) with HSMS protocol. The meaning of the messages is
provided in the message details section in which the message content is defined.
Serial communication (SECS-I):
The data is transmitted or received as a serial bit stream with 10 bits per character in a
supported data rate. A standard character has a start bit, 8 data bits and a stop bit. No parity
bits or other controls are used for transmitting the individual bytes.
Default setting: 19200 / 8N1
Details about the data definition and the data transmission are provide in the SEMI Standard
E4. (SEMI Equipment Communication Standard 1 Message Transfer SECS-I)
Ethernet communication (HSMS):
The reading device functions as a HSMS server. This means that it waits for a connection
request from a HOST PC (client).
TCP/IP: IP-Adress xxx.xxx.xxx.xxx Port 3241
If there is a connection request from a HOST, a HSMS connection is set up and the SECS II
messages defined in the message record are transmitted from the reading device to the
respective HOST and vice versa. The HSMS connection remains intact until it is specifically
terminated by the host or the reading device.
All reading devices available in the network (LAN) can be operated from any HOST PC. A
HSMS reading device, however, can no longer be connected to more than one HOST
simultaneously.
The network settings can be changed using a
change to the network settings causes the unit to reboot and thus disconnects existing
communication connections.
11.1 Structure of a message
The communication structure and process is defined by the SEMI Equipment Communications
Standards E4, E5 and E37 (SECS-I, SECS-II, HSMS).
SECS message blocks always have a specified structure that consists of 1-4 length bytes, 10
bytes of message headers and message data.
