Owner's manual

Table Of Contents
Equipment-to-Host Messages 3-29
3.7 Remote Commands
Processing at the Equipment can be guided by either a local Operator or by a Host computer. This section
describes the remote commands available to the Host.
Much of the behavior of the Equipment and its acceptance of remote commands is directed by
requirements of the Control State. For a complete description of the Control State, refer to 3.2 Control
States.
The Equipment will accept remote commands only when the Control State is Remote.
The Host has the ability to configure whether the Equipment will transition to Remote or Local as a
default upon entering the On-Line state from Off-Line. This can also be done through the SECS/GEM
Setup dialog box in FmNT.
Once in the Remote state, the Host has the authority to issue any of these remote commands and they will
not be rejected because of an invalid control state. Commands may be rejected for other reasons (trying to
start a process with no material loaded, etc.).
While in Remote state, the Operator still has the ability to issue commands and change the control state. If
the Operator issues a command while in Remote state, the Equipment will send the Operator Command
collection event if enabled. When the Operator “grabs” control away from the Host by changing the
Control State to Local, the Equipment will send either the GemControlStateLOCAL or
GemEquipmentOFFLINE event to the Host. The Host also has the ability to put the Equipment into a
Local state by sending the LOCAL remote command while in Remote state. Furthermore, if the Operator
presses any of the buttons on the Run Window (GO, PAUSE, STOP, ABORT), the Host will get the
corresponding events (StartCmd, PauseCmd, StopCmd, AbortCmd - refer to Appendix B).