UTMC OTU/MOVA Handbook
667/HB/31601/000
Page 100
Issue 5
7.6 MULTIPLE MOVA STREAMS
Up to four traffic streams can be controlled, each with its own copy of MOVA and its
own MOVA data set loaded separately. The controller interface can be one of the
following:-
via the serial interface, where a ST800 family controller is available
via BUS/MOVA I/O cards, where a free standing installation is required.
7.6.1 Serial Interface to Controller
The serial protocol from the controller to Outstation provides a status message
supporting up to 64 detector status bits and 32 green confirms. In the Outstation to
controller direction there is a capacity for up to 32 force bits. This capacity must be
shared by all the MOVA streams.
7.6.1.1 Detector Inputs
The 64 detector bits can be allocated as required across the streams assuming the total
does not exceed 64.
CAUTION: The 64 detector inputs are shared by all streams and so the MOVA
configurations should reflect this i.e. In MOVA Setup the detectors for MOVA1 should
be allocated to different detector numbers to those for MOVA2.
7.6.1.2 Stage Confirms
The stage confirms can be mapped as required on the OSE Config screens, within the
limits of the 32 reply bits sent from the controller. The mapping of the stage confirms
must match the configuration of the controller reply bits. It is recommended to start the
stage confirm bits for each stream on a byte boundary, so that the limit of each stream
is easier to see, but this may not always be possible on a large controller.
The Controller Ready Bit (CRB) for MOVA stream 1 is in the message header, as for a
single stream installation. The CRB for additional streams must be set by special
conditioning in the controller, where these are required.
