User Manual

IDentity Flex Hardware Manual – Installation sirit
Version 2.3 Page 46
DISCRETE OUTPUT POLARITY, PULSE WIDTH AND DELAY
There are two discrete outputs per reader channel. The outputs are LAMP and
GATE. The active levels for both of these outputs are configurable to active high
or active low. The Pulse Width and mandatory time delay between successive
output pulses are also configurable via the configuration menus.
OPTO-ISOLATED RELAY CONTROL BOARD
As an option, SIRIT offers 4-module or 16-module opto-isolated relay
motherboards that provides either AC or DC input modules to satisfy the
switching requirements of a wide range of lamps and gates. The pre-wired relay
motherboard interfaces to J5, the 37-pin I/O connector and provides terminal-
block connections for peripheral device wiring. The cable assemblies for the
relay boards and the relay support panel are also provided in the option package.
Gate Input or Loop Input Relays
Under certain conditions users may elect to arm (turn on) the SIRIT antenna
based upon a change of state of a gate position or loop output circuit. Arming the
antenna can be accomplished by using the gate position input or both inputs tied
in series.
Two methods are available for this purpose:
Dry Contact Switch or Relay
A dry contact relay (no voltage being applied) is connected between the reader’s
discrete I/O connector ground and desired discrete input pin. The active logic
level for the discrete input (reader responds to either a high or low) may be
configured via the input polarity mask in the system setup menu. No outside
voltage source is required or desired to provide a discrete input signal to the
reader. If noise or voltage is unintentionally placed on either the ground or
discrete input lines connected to the reader, a second isolation relay will break
the noisy circuit.
AC or DC Input Relay Module
The second method of activating a discrete input is by using an opto-isolated
input relay module. The modules are designed to accept either an AC or DC
input signal within the modules specified operating range. The advantage to
using the opto-isolated module is that it presents an optical barrier between the
input equipment and the reader.