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High-Speed SECS Message Services
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<p>The High-Speed SECS Message Services (HSMS) protocol is a <a href="/facts/Session_layer/Yxo8uqLr">Session layer</a> protocol for communication between production equipment and factory control systems in semiconductor factories. HSMS defines a <a href="/facts/TCP/IP/KNkxtSpw">TCP/IP</a> based session for use with sending <a href="/facts/SECS-II/1HeDh12V">SECS-II</a> messages. It is intended as a high speed alternative to the serial (<a href="/facts/RS-232/NCpvGuyq">RS-232</a> based) <a href="/facts/SECS-I/lvv1gxge">SECS-I</a> protocol. HSMS is defined in the standard <a href="/facts/SEMI/mSIvBLqY">SEMI</a> E37, and its subordinate standards: SEMI E37.1, and the withdrawn SEMI E37.2. </p><p>The E37 standard, labelled Generic Services defines how to establish and break a TCP/IP connection, begin and end a logical link over that connection, send data (particularly <a href="/facts/SECS-II/1HeDh12V">SECS-II</a> messages), recognize error conditions, and test connection integrity. The E37.1 standard, labelled Single Selected-Session Mode (HSMS-SS) restricts E37 to scenarios involving a single connection between host and equipment, for point-to-point communication, directly replacing the use cases of <a href="/facts/SECS-I/lvv1gxge">SECS-I</a>. </p>