System Components and Technical Data
SICAM A8000 / CP-8000 • CP-8021 • CP-8022 Manual Unrestricted 103
DC8-037-2.02, Edition 10.2017
5.5.2 DIAST0
5.5.2.1 Functions
Communication of a central station with up to 100 substations.
• Unbalanced dial-up traffic Slave based on IEC 60870-5-101
DIAST0 is substation
• Controlling connection establishment and disconnection
─ Connection establishment spontaneously and cyclically, control-
ling station ó controlled station
− Establishing a connection cyclically at a settable interval (monitoring cycle)
∗ for transmission of low-priority data
∗ for monitoring the station availability
∗ for clock synchronization
─ Controlling connection establishment by means of modem commands
− AT Hayes, V.25bis, X.20, X.28
− Arbitrary main telephone number of a telephone network (PSTN)
─ Access control (LOGIN with password) in the private range of IEC 60870-5-101
─ Disconnection control in the private range of IEC 60870-5-101
• Communication when a connection is established according to
unbalanced multi-point (dial-up traffic) based on IEC 60870-5-101
─ Data acquisition by polling (station interrogation)
─ Acquisition of events (transmission of data ready to be sent)
─ General interrogation, outstation interrogation
─ Clock synchronization
− Each time a connection has been established
− When a connection is established, one time per minute
─ Command transmission
─ Transmission of integrated totals
• Co-ordination of several masters in "multi-master operation" (availability and data through-
put)
─ The controlling station can simultaneously establish connections to different controlled
stations
• Standby transmission line(s) by means of standby telephone numbers of the same or an-
other (PSTN) telephone network
• Multi-hierarchical configurations
• Optimized parameters for selected transmission facilities
• Toll-saving transmission strategies
• Having a telephone set connected in parallel
• Functions for supporting redundant communication routes
Note
The previously mentioned functions are described in detail in the document SICAM SICAM RTUs • Ax
1703 Common Functions Protocol Elements, section "Dial-Up Traffic (DIA)".
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