00191134-03 - 第129页
GEM for SIPLACE V5.01 ©Siemens AG, all rights r eserved page 129 of 252 +RVW(VWDEOLVKHV&RPPXQLFDWLRQV Assum ption: Equipm ent's Com m unication state is either "Enabled/Not Com munic ating" or…
GEM for SIPLACE V5.01
Page 128 of 252 ©Siemens AG, all rights reserved
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Unless otherwise noted in this section, the Communications State is "Communicating"
and the Control state is either "On-Line/Local" or "On-Line/Remote".
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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
„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.
GEM for SIPLACE V5.01
©Siemens AG, all rights reserved page 129 of 252
+RVW(VWDEOLVKHV&RPPXQLFDWLRQV
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
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.
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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
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.
GEM for SIPLACE V5.01
Page 130 of 252 ©Siemens AG, all rights reserved
/RVLQJ&RQQHFWLRQ5H&RQQHFWLQJ
Step SECS Message Description
1. H <- E SxFy Any Message. The Equipment encounters
SECS block transmission errors while
attempting to send a message to the Host.,
and reaches its Retry Limit (RTY). The
Equipment considers the SECS link as
disconnected. Spooling will become Active if
enabled.
2. H <-E S1F13 W Connect Request. The Equipment attempts to
re-establish the link.
3. If the send is not successful, or if no reply is
received from the Host, the Equipment waits
for „EstablishCommunicationsTimer“ seconds
and then goes back to step 2.
4. H -> E S1F14 The Host acknowledges, sending COMMACK
of „0“. The link is now re-connected.
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Step SECS Message Description
1. H <- E S1F1 W Are You There. The Equipment sends this
message periodically to determine if the SECS
link is still intact.
2. H -> E S1F2 On Line Data. The Host replies. The
Equipment knows that the link is still intact.