STRASBAUGH, INC.
7AF SECS/GEM Interface Ver. 1.9 February 19, 2002 5-3
Strasbaugh Confidential
5-3
5.1.1.1 STATE TRANSITIONS
The following transitions can occur. Transitions of the Communication Finite State Machine diagram do not cause the
7AF to signal any Collection Event ID (CEID), nor to send Event Reports to the Host.
Table 8 Communications States
#
From
Trigger
To
Description
1
Unknown
Power-Up
Conditional Equipment will initialize itself to either the
Disabled or Enabled state, depending on the
configuration of the EC
INITCOMMSTATE (VID 40).
2
Disabled
Operator enables
SECS link.
Enabled
Equipment will attempt to establish
communications with the Host. The 7AF
will periodically send a Connect Request at
an interval dictated by the EC
ESTABLISHCOMMUNICATIONS-
TIMER
(VID 52).
3
Enabled
Operator disables
the SECS link.
Disabled
Communications are abruptly terminated.
Any outstanding messages queued for send
are discarded. The Equipment will not
respond to a Host-initiated ENQ.
4
Disabled or
Power-Up
Request has been
made for the 7AF
to start
communicating.
Not
Communicating
Equipment immediately attempts to
establish communications with the Host.
The 7AF will periodically send a Connect
Request message at an interval dictated by
the EC ESTABLISH-
COMMUNICATIONSTIMER (VID 52).
5
Not
Communicating
Successful
completion of
Connect Request
transaction.
Communicating
The Host / Equipment link is "up". Normal
SECS transactions can occur.
6
Communicating
A
communications
failure has
occurred.
Not
Communicating
Equipment immediately attempts to
establish communications with the Host.
The 7AF will periodically send a Connect
Request message at an interval dictated by
the EC ESTABLISH-
COMMUNICATIONSTIMER (VID 52).
To Next Page
