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S I P L A C E G EM S W V e r s i on G EM 505 . 03 SP 1 H O S T I n t e r f a c e M anua l ©S i e m en s A G, a ll r i gh t s r e s e r v ed page 141 o f 241 5 SE C S S ce n a r i o s U n l e ss o t he r w i s e no t ed i…

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SIPLACE GEM SW Version GEM 505.03 SP1 HOST Interface Manual
Page 140 of 241 ©Siemens AG, all rights reserved
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SIPLACE GEM SW Version GEM 505.03 SP1 HOST Interface Manual
©Siemens AG, all rights reserved page 141 of 241
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".
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 „{XE
„EstablishCommunicationsTimer“}ESTABLISH
COMMUNICATIONSTIMER“ seconds, then go
to step 1.
3. H -> E S1F14 The Host responds with Establish
Communications Acknowledge. If {XE
„COMMACK“}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.
SIPLACE GEM SW Version GEM 505.03 SP1 HOST Interface Manual
Page 142 of 241 ©Siemens AG, all rights reserved
5.1.2 Host Establishes Communications
Assumption: Equipment's Communication state is either "Enabled/Not Communicating"
or "Enabled/Communicating".
Step SECS Message Description
1. H -> E S1F13 W Host sends Establish Communications
Request.
2. H <- E S1F14 The Equipment responds with Establish
Communications Acknowledge, with {XE
„COMMACK“}COMMACK set to zero. After
this message is successfully sent,
communications is established. If the current
communication state is „Not Communicating“,
the Equipment changes its communication
state to „Communicating“. If the state is
„Communicating“, no change in
communication state occurs. In either case,
subsequently received messages are
processed normally.
5.1.3 Simultaneous Establish
Assumption: Equipment's Communication state is "Enabled/Not Communicating".
Step SECS Message Description
1. H <- E S1F13 W Equipment sends Establish Communications
Request.
2. H -> E S1F13 W Host sends Establish Communications
Request.
3. H <- E S1F14 The Equipment responds with Establish
Communications Acknowledge, with {XE
„COMMACK“}COMMACK set to zero. After
this message is successfully sent,
communications is established. The
Equipment changes its communication state to
Communicating.
4. H -> E S1F14 The Host responds with Establish
Communications Acknowledge, with
COMMACK set to zero. This step could occur
before step 3, in which case communications
would be established at this step.