User Manual
“Halo” System: Communication Protocol 970-00002-000
EXI Wireless Systems, Confidential Page 4 of 33 July 27, 1999
1. Document Purpose.......................................................................................................... 6
2. Introduction..................................................................................................................... 7
3. System Architecture......................................................................................................... 8
3.1. Host..............................................................................................................................8
3.2. Data Gathering and Control Nodes...........................................................................8
3.2.1. Controller...................................................................................................................................... 9
3.2.2. Elevator......................................................................................................................................... 9
3.2.3. Receiver......................................................................................................................................... 9
3.3. Sensors.........................................................................................................................9
3.4. Communication...........................................................................................................9
3.4.1. RF Communication....................................................................................................................10
3.4.2. Weigand Communication...........................................................................................................10
3.4.3. Control Lines Communication ..................................................................................................10
3.4.4. EIA-485 Communication...........................................................................................................10
4. RF Communication Protocol.......................................................................................11
4.1. Tag in the Field (TIF Alarm)....................................................................................11
4.1.1. Field of coverage ........................................................................................................................11
4.1.2. Bit By Bit Interrogation..............................................................................................................12
4.1.3. Respond Command.....................................................................................................................13
4.1.4. Reset Command..........................................................................................................................14
4.2. Tag Initiated Communication (TIC alarm) .............................................................14
4.2.1. Message format...........................................................................................................................15
ID number format........................................................................................................................................16
5. Weigand Communication Protocol.............................................................................17
5.1. General ......................................................................................................................17
5.2. Weigand Messages....................................................................................................17
5.2.1. Parity Bits (Even and Odd).........................................................................................................18
5.2.2. Control Code...............................................................................................................................19
5.2.2.1. Normal................................................................................................................................19
5.2.2.2. Bypassed..............................................................................................................................19
5.2.2.3. TIF Alarm............................................................................................................................19
5.2.2.4. Loiter...................................................................................................................................19
5.2.2.5. Host Alarm ON...................................................................................................................20
5.2.2.6. Unlock Request ON ...........................................................................................................20
5.2.2.7. TIC Alarm...........................................................................................................................20
5.2.2.8. Test Mode ...........................................................................................................................20
5.2.2.9. Pin Number Entry...............................................................................................................20
5.2.2.10. Event (Door Open).............................................................................................................20
5.2.2.11. Switch Configuration.........................................................................................................20
5.2.2.12. Status...................................................................................................................................22
6. Signal lines communication.........................................................................................24
7. EIA-485 Communication.............................................................................................26
7.1. General ......................................................................................................................26