Operations Manual

EXI HALO Installation & Operation Manual 981-000003-000
EXI Wireless Systems 31 March 2000
Revision 2.0
7. Theory of Operation
The EXI HALO system uses Radio Frequency waves for communications between the HALO system components
and the Tags. The HALO Controller continuously emits a 307 kHz RF frequency via the Exciter Antenna, setting up
a field in its local area. When a Tag enters this field, a Radio Receiver within the Tag senses the 307 kHz RF field
and transmits its identification information to the HALO Controller using a low level Radio Signal at frequency of
434 MHz.
Figure 23 - Controller Operation
7.1. Tag Communications
All Halo tags will transmit their serial number whenever they first enter a field created by a HALO controller.
We refer to this type of communication as a TIF (tag in field) for the purpose of brevity. The HALO controller
is able to communicate directly with one Tag even if there are multiple Tags in the field since the
communication is bi-directional. The Tag will not retransmit its serial number again until it is reset by the
controller or out of the field for at least 6-18 seconds.
If a Tag is able to receive communication from 2 different controllers in the case of field overlap, it will try to
respond to both controllers thereby inhibiting any alarms. Each controller will see Tag communication when it
doesn’t expect it and report it as noise. While in the field, the Tag continues to communicate with the controller
but in a limited way in order to conserve battery power. Because of this limited communication, the controller
has no way of knowing when each Tag leaves the field. It can only tell that there is still at least 1 Tag in the
field. It takes 6-18 seconds of all the Tags being out of the field before the controller will recognize that the
field is empty.
Some types of tags will also transmit their serial number when certain events occur to the tag. We refer to this
transmission as a TIC (tag initiated communication). All HALO Controllers and Receivers can pick up these
transmissions. P-Tags transmit a TIC whenever the Tag is first removed from the body and again after variable
intervals, the longest being 4 minutes. The Tag has to be put back on the body for 10 seconds to reset it before
it will repeat its pattern.
7.2. HALO System Communications
HALO Controllers and Receivers connected to the network report any events to the HALO PC Console, in
addition to responding to such events locally. A HALO Controller, if configured as such, will independently
control its associated door in the presence of a Tag at its door, in addition to reporting such an event to the
HALO PC Console. This ensures that local control and security is maintained regardless of the state of the
HALO network or PC Console. All devices that are connected to the RS485 communications bus are fully
supervised such that any device failure is reported at the console immediately
RECEIVE
ANTENNA
RBC
FCC ID# HE7MAX
TRANSMIT OUTPUT
SEA #1
SEA #2
Made in Canada . . with care
Controller
by
Power
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
+24V DC Input System Ground +12V Ou 200 ma System Ground Weigand 0/Data Weigand 1/Gnd System Ground MagOut 24V 200 ma Door Switch In System Ground Unlock In Override In Strobe In N.O COM N.C. N.O COM N.C
Relay #1 Relay #2
Alarm In
OFF ON
EXI ELECTRONIC SYSTEMS
Winnipeg, Manitoba [phone]
Made in Canada
PRODUCT MODEL NO. SERIAL NO>
ROAM II/TAGRRR SEA-M 1118
HALO Controller
RX
Antenna
SRA
Exciter
Antenna
434 MHz
307 KHz
Transponder
R2 Controller