Owner's manual

5-10 SECS Scenarios
5.4 Control State
5.4.1 Host Sends On-Line Command
Assumption: Control State is “Host Off-Line”. Variable GemControlState = 3.
Table 5-26 SECS Messages Host Sends On-Line Command
Step SECS Message Description
1 H -> E S1F17 W Host instructs the Equipment to go “On-Line”.
2 H <- E S1F18
Equipment responds to successful On-Line transition with
ONLACK=0. Control state transits to either Local or Remote as
guided by EC GemOnlineSubstate.
3 H <- E S6F11 W
The Equipment signals CEID:
GemControlState LOCAL
or
GemControlState REMOTE.
4 H -> E S6F12 The Host acknowledges the event.
5.4.2 Host Sends Off-Line Command
Assumption: Control State is “On-Line”.
Table 5-27 SECS Messages Host Sends Off-Line Command
Step SECS Message Description
1 H -> E S1F15 W Host instructs the Equipment to go “Off-Line”.
2 H <- E S1F16
Equipment Control State transitions to “Host Off-Line”
(GemControlState = 3) and responds to primary. OFLACK = 0.
5.4.3 Host Sends Remote Command
Assumption: Control State is on-line and Remote.
Table 5-28 SECS Messages Host Sends Remote Command
Step SECS Message Description
1 H -> E S2F41 [W]
The Host sends the command. The W-bit in this message bay be
either 0 or 1.
2 H <- E S2F42
If the W-bit was 1, the Equipment acknowledges the command. If
the Equipment cannot perform the command, the acknowledge
code in this message is non-zero. If the command can be
completed “immediately”, the command is performed and the
acknowledge code in this message is 0. Otherwise, if the
command takes a significant amount of time to complete, the
acknowledge code is 4. Successful completion of a command
may trigger one or more events.