%T Active Serial Port: A Component for JCSPNet Embedded Systems
%A Sarah Clayton, Jon Kerridge
%E Ian R. East, David Duce, Mark Green, Jeremy M. R. Martin, Peter H. Welch
%B Communicating Process Architectures 2004
%X The javax.comm package provides basic low\-level access
between Java programs and external input\-output devices, in
particular, serial devices. Such communications are handled
using event listener technology similar to that used in the
AWT package. Using the implementation of active AWT
components as a model we have constructed an active serial
port (ASP), using javax.comm, that gives a channel interface
that is more easily incorporated into a JCSPNet collection
of processes. The ASP has been tested in a real\-time
embedded system used to collect data from infrared detectors
used to monitor the movement of pedestrians. The collected
data is transferred across an Ethernet from the serial port
process to the data manipulation processes. The performance
of the JCSPNet based system has been compared with that
supplied by the manufacturer of the detector and we conclude
by showing how a complete monitoring system could be
constructed in a scalable manner.
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