User Manual

IDentity Flex Hardware Manual – Installation sirit
Version 2.3 Page 37
SYSTEM HOST INTERFACE JUMPERS
The jumpers located above the host port connector labeled J4 are used to enable
the RS-485 function and apply the appropriate transmission line resistive
termination. If the reader being configured is the last device on a multi-drop
network, the host connector must be terminated using J4-3 and J4-4 inserted.
J4-1 RS-485+ connection to Host Connector Pin 4
J4-2 RS-485- connection to Host Connector Pin 5
J4-3 Connection for termination resistor to Host Connector Pin 3
J4-4 Connection for termination resistor to Host Connector Pin 4
WIEGAND COMMUNICATIONS CONNECTIONS
The Wiegand Interface can be user selectable to any of the standard Wiegand bit
formats. The Wiegand interface is essentially the transmission of data 1 (5 V) or
data 0 (0 V). The Wiegand output protocol may be configured for data stream bit
lengths from 26 to 34 bits. The first and last bits of the data stream are parity bits
and not part of the tag id.
Example: To convey a 23 bit data word length, the Wiegand data bits would be
configured for 26 bits.
For other customized Wiegand formats, please contact SIRIT for more
information.
Wiegand cables are interfaced to the reader at the connector designated as
“WIEGAND OUTPUTS”.
Wiegand cables should be made using two, individually shielded, twisted-pairs
(i.e., a four-wire cable). Each pair should carry one of the data lines and a ground
line (i.e., pair one - Data 0 and GND, pair two - Data 1 and GND).
Whenever connectors or jumpers are to be removed TURN OFF AC POWER
FIRST!
Table 3.5 – Wiegand Interface Specifications
26 Bit Wiegand Interface 34 Bit Wiegand Interface
Total 26 bits Total 34 Bits
Parity Bits Positions 0 and 25 Parity Bits Positions 0 and 33
High parity bit Even (1-12) High Parity Bit Even (1-16)
Low Parity Bit Odd (13-24) Low Parity Bit Odd (17-32)
Most Significant Bit Sent First Most Significant Bit sent First