Operations Manual

EXI HALO Installation & Operation Manual 981-000003-000
EXI Wireless Systems 46 March 2000
Revision 2.0
10. Appendix A - Weigand Output Specification
Fields # of bits
Even Parity bit (first)1 Parity bit + next 16 bits = 0
Control code 4 used to distinguish message types
Door bit 1 1 = Door open, 0 = Door closed
Maglock bit 1 1 = Maglock On, 0 = Maglock off
Info - 1 8 Info bytes are dependant on message type (see below for descriptions)
Info- 2 8 either bit patterns bit 7 -> bit 0
Info - 3 8 or 6 digits (1 digit = 4 bits)
Odd Parity bit (last)1 Parity bit + previous 16 bits = 1
Total 32
The control code that accompanies Tag serial #’s not only identifies that this message contains a Tag serial #
but it also describes the state of the controller at the time.
Message Types Control Code
Decimal (Binary)
Info - 1 Info - 2 Info - 3
Tag Serial # -ABCDEF Tag digits - AB Tag digits - CD Tag digits - EF
- normal 0 (0000) “ “ “
- Bypassed 4 (0100) “ “ “
- TIF alarm 1 (0001) “ “ “
- Loiter 3 (0011) “ “ “
- Host alarm 2 (0010) “ “ “
- Unlock Req 5 (0101) “ “ “
- TIC 7 (0111) “ “ “
- Test Mode 10 (1010) “ “ “
PIN # Entry
0 = no key, A = zero key
8 (1000) eg. 4 Key presses
0 (0000) 0 (0000)
“0123”
A(1010) 1(0001) 2(0010)
3(0011)
Event (elevator only) 9 (1001) Door Opened = 00 00 01
Switch Selections 11 (1011) Version # Mode/Option ID Range
High/Low
Status - sent after any
significant changes
12 (1100) Noise Counter Input states Device Status
Status message information definition:
Noise Counter - indicates the number of times the device has detected something on its receiver but couldn’t
make sense of it. This counter decrements over time if noise goes away. The status message gets sent for a
Noise Alarm ON (when this counter rolls over to 100(64Hex)) and then again when the Noise Alarm Clears
(gets back to zero).
Device Status
- Normal (nothing happening) = 00
bit 7 - not used
bit 6 - RF field occupied by tag(s)
bit 5 - In Override
bit 4 - In Unlock
bit 3 - In Bypass
bit 2 - Host alarm
bit 1 - TIC Alarm
bit 0 - TIF alarm
Input states
- nothing “on” will equal 73Hex
bit 7 - not used
bit 6 - Strobe 0 = ignore other host inputs
bit 5 - Override 0 - override request
bit 4 - Unlock 0 = lock release request
bit 3 - bypass key 1 = pressed
bit 2 - Reset key 1 = pressed
bit 1 - Alarm 0 = Host alarm request
bit 0 - Door switch 1 = open, 0 =
closed