Owner's manual

Equipment-to-Host Messages 3-3
3.1.1.1 State Transitions
The following transitions can occur. Transitions shown in Figure 3-1 do not cause the Equipment
to signal any Collection Event ID (CEID) or to send Event Reports to the Host.
" NOTE The numbers in the # column refers to those in Figure 3-1.
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
Equipment will periodically send a
Connect Request at an interval dictated
by the EC
ESTABLISHCOMMUNICATIONS-
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
Equipment to start
communicating.
Not
Communicating
Equipment immediately attempts to
establish communications with the Host.
The Equipment will periodically send a
Connect Request message at an
interval dictated by the EC
ESTABLISHCOMMUNICATIONS-
TIMER (VID 44).
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 Equipment will periodically send a
Connect Request message at an
interval dictated by the EC
ESTABLISHCOMMUNICATIONS-
TIMER (VID 44).