Manual

3-4 Operating Characteristics
3.1.1.1 State Transitions
The following transitions can occur. Transitions of the Communication Finite State
Machine diagram do not cause the GES-1993 to signal any Collection Event ID
(CEID), nor to send Event Reports to the Host.
Table 3-1 State Transitions
# 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 7).
2 Disabled Operator
enables SECS
link.
Enabled Equipment will attempt to
establish communications with
the Host. The GES-1993 will
periodically send a Connect
Request at an interval dictated
by the EC
ESTABLISHCOMMUNICATION
S-TIMER (VID 44).
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 GES-1993 to
start
communicating.
Not
Communicating
Equipment immediately
attempts to establish
communications with the Host.
The GES-1993 will periodically
send a Connect Request
message at an interval dictated
by the EC
ESTABLISHCOMMUNICATION
S-TIMER (VID 44).
5Not
Communicating
Successful
completion of
Connect
Request
transaction.
Communicating The Host / Equipment link is
"up". Normal SECS
transactions can occur.
6 Communicating A communi-
cations failure
has occured.
Not
Communicating
Equipment immediately
attempts to establish
communications with the Host.
The GES-1993 will periodically
send a Connect Request
message at an interval dictated
by the EC
ESTABLISHCOMMUNICATION
S-TIMER (VID 44).