User's Manual

Page 11
E Series Data Radio – User Manual
© Copyright 2005 Trio DataCom Pty. Ltd.
Part C – Applications
Systems Architecture
Point-to-Point
This simple system architecture provides a virtual connection
between the two points, similar to a cable. Dependent of the
hardware chosen, it is possible to provide a full duplex connection
(i.e. data transfer in both directions simultaneously) if required.
Point-to-Multipoint Systems
In a multiple access radio system, messages can be broadcast
from one (master) site to all others, either using a half duplex radio
system or from any site to all others, using a simplex radio channel.
Half duplex systems often utilise a full duplex master, to make the
system simpler and for faster operation.
In either case, it will be necessary for the application to support
an addressing system, since
the master needs to be able
to select which remote device
it with which it wishes to
communicate. Normally, the radio
system is allowed to operate
“transparently”, allowing the
application’s protocol to provide
the addressing, and thus control
the traffic. Where the application
layer does not provide the
addressing, the E Series can
provide it using SID codes™.