Owner's manual

Table Of Contents
5. SECS Scenarios
Unless otherwise noted in this section, the Communications State is “Communicating” and the Control
state is either “On-Line/Local” or “On-Line/Remote”.
5.1 Equipment Communications
5.1.1 Equipment Establishes Communications
Assumption: Equipment’s Communication state is “Enabled/Not Communicating”.
Table 5-1 SECS Messages Equipment Establishes Communications
Step SECS Message Description
1. H <- E S1F13 W Equipment attempts to send Establish Communications Request.
2. If the send is not successful, or if no reply is received from the
Host, wait “ESTABLISHCOMMUNICATIONSTIMER” seconds,
then go to Step 1.
3. H -> E S1F14 The Host responds with Establish Communications Acknowledge.
If COMMACK in this message is non-zero, wait
“ESTABLISHCOMMUNICATIONSTIMER” seconds, then go to
Step 1. If COMMACK is zero, proceed to the next step.
4. Communications is successfully established. The Equipment
changes its communication state to Communicating. Normal
SECS message processing begins.
SECS Scenarios 5-1