|Introduction to SECS/GEM - Beginner's Guide|
|SEMI E30 GEM standard|
|SEMI E5 SECS-II Message|
|SEMI E37 HSMS|
|How We Can Help You|
HSMS is the transport layer built on top of the TCP/IP protocol and it is intended as an alternative to SEMI E4 (SECS I) for applications where higher speed communication is needed or when a simple point to point topology is insufficient.
As HSMS protocol is derived from TCP/IP, the following settings are required for both Host (client) and Equipment (Server):
Implementations of HSMS must provide for installation time setting of the following parameters. The range and resolution of all parameters must be at least as shown in the table.
|Parameter Name||Range||Typical Settings||SEMI - SECS/GEM|
|T3 Reply Timeout||1-120 secs||45 secs||Reply timeout. Specifies maximum amount of time an entity expecting a reply message will wait for that reply|
|T5 Connection Separation Timeout||1-240 secs||10 secs||Connection Separation Timeout. Specifies the amount of time which must elapse between successive attempts to connect to a given remote entity|
|T6 Control Transaction Timeout||1-240 secs||5 secs||Control Transaction Timeout. Specifies the time which a control transaction may remain open before it is considered a communications failure.|
|T7 Not Selected timeout||1-240 secs||10 secs||Time which a TCP/IP connection can remain in NOT SELECTED state (i.e., no HSMS activity) before it isconsidered a communications failure|
|T8 Network Intercharacter Timeout||1-120 secs||5 secs||Maximum time between successive bytes of a single HSMS message|