User Manual

“Halo” System: Communication Protocol 970-00002-000
EXI Wireless Systems, Confidential Page 7 of 33 July 27, 1999
2. Introduction
“Hallo” system is specialized data gathering and control system which is using different communication
media and protocols to achieve its tasks. The system consists of several major building blocks – Host,
Controllers (Elevators, Receivers) and Tags.
Data that are gathered are information sent by the Tags.
The system can be used in different applications and some of them include:
• Patient monitoring (P-Tag)
This is primary application for the “Hallo” system. It can be used in the hospitals to prevent babies
abduction or to restrict movement for certain groups of patients that need to be monitored (e.g. Alzheimer
patients).
• Asset monitoring (A-Tag)
The “ Hallo” system can be used to prevent or warn of any unauthorized assets relocation (e.g. a notebook
computer which shouldn’t leave the room or the building).
• Distress monitoring (D-Tag)
In this application D-Tags are used to signal some abnormal situation and they are activated by person who
is carrying it. (e.g. a nurse threatened by a violent patient)
Each one of these Tags is using the same protocol and has virtually the same functionality within the
system. The difference is in peripheral sensing circuitry which will determine how are they activated. In
order to simplify this protocol description, all of them will be referred to just as Tags.