STRASBAUGH, INC.
5-4 February 19, 2002 7AF SECS/GEM Interface Ver. 1.9
Strasbaugh Confidential
5.1.1.2 COMMUNICATION STATES
The current Communication State will be one of the following values. There is no Variable indicating the
Communication State. The communication State is presented to the Operator on the main Operator interface screen.
5.1.1.2.1 DISABLED
The SECS link to the Host is disabled at the 7AF. The Equipment will send no messages to the Host. The Equipment
will not respond to a Host-initiated ENQ.
5.1.1.2.2 ENABLED
When communications are Enabled, the Equipment's intention is to be in communication with the Host. Whether or not
the 7AF is currently communicating with the Host determines which sub-state of the Enabled super-state the 7AF is in.
5.1.1.2.2.1 COMMUNICATING
The SECS link between the 7AF and the Host is operating normally.
Periodically, the Equipment will send a "Heartbeat" message S1F1 to ensure that the link is still operating. The heartbeat
frequency is controlled by Equipment Constant HEARTBEAT. HEARTBEAT (VID 51) can range from 0 to 32000, with
default value 30.
If the Equipment encounters a SECS-I Retry Limit (RTY) error when attempting to send a block to the host, it discards any
messages queued for send and the communication state transits to ENABLED.
5.1.1.2.2.2 NOT COMMUNICATING
The SECS link to the Host is enabled at the 7AF, and the Equipment is attempting to determine if the link is active. The
Equipment periodically sends S1F13 (Establish Communications Request).
If the connect is not successful for any reason, the Equipment will try again periodically forever. The time between
attempts is controlled by the Equipment Constant ESTABLISHCOMMUNICATIONSTIMER. This variable (VID 52) can
range from 0 to 32000 seconds, with default of 60 seconds.
Once the Host has responded with S1F14 (Establish Communications Acknowledge), the Communication State will
change to COMMUNICATING.
The Host can also attempt to establish communications by sending S1F13. The Equipment will accept the message and
respond with S1F14 and the Communication State will change to COMMUNICATING.
In ENABLED state, the 7AF will accept messages from the Host, but will ignore any messages except S1F13 and S1F14.
The 7AF will respond to the S1F13 while the Communication State is ENABLED or COMMUNICATING, but it will not
send S1F13 once communications have been established.
5.1.2 Power Up
At Power Up (or System Start), the Equipment Constant INITCOMMSTATE (VID 40) controls whether state is
initialized to DISABLED or ENABLED. The factory setting is DISABLED.
5.1.3 Related Variables
The following table lists the variables (SV's, EC's, or DVVALS) which are relevant to establishing communications . For
a more complete description of these variables, see "Appendix A -- Variables".
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