4RF Aprisa SR+ User Manual - page 354
352 | Product Options
Aprisa SR+ User Manual 1.5.3
RF Switch
The SR+ Protected Station uses the alarm outputs to control the RF switch. The RF switch controls which
radio the antenna is connected to. The default state connects the antenna to the legacy radio.
All SCADA data is directed through the SR+ Protected Station, which then passes any traffic destined for
the legacy network to the legacy base station when it was safe to use the radio channel.
Redundancy
The migration switch contains a fully redundant RF switch, operating as a part of the MMS. Any hardware
failure in the migration switch (or master station) results in a switchover and the MMS will continue to
operate switching traffic between the legacy and Aprisa SR+ networks. The MMS provides full protection to
the master station site.
Operating Configurations
The Aprisa SR+ MMS supports standard legacy radio networks, with repeater based network support
scheduled for the near future. The MMS supports integration with legacy networks with the master station
operating in non-continuously keyed switched carrier mode. The legacy network traffic must be serial
utilizing a standard poll / response protocol.
Support is protocol specific. Multiple protocols including DNP3, Modbus and a range of others are
supported with the initial release. Additional protocols will be released on customer request.
Configuration Management
The Aprisa SR+ MMS is managed with the embedded web-based management tool, SuperVisor. See
‘Protected Station: Terminal > Operating Mode > MMS’ on page 273 , ‘Protected Station: Maintenance >
SCADA’ on page 289 and ‘Protected Station: Maintenance > MMS’ on page 291 for the MMS settings.
Changes to the Network Table are automatically synchronized from the active radio to the standby radio
but the Network Table is only visible on the active radio.