User Manual
SECS Scenarios 5-3
5.1.4 Losing Connection, Re-Connecting
Table 5-4 SECS Messages Losing Connection, Re-Connecting
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.
5.1.5 Heartbeat
Table 5-5 SECS Messages Heartbeat
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.