Schlage PIB300 User Manual page 328

Planning an Installation
Door Control
Output
Lock Output
Mode
Card Reader
Emulation
Mode
NOTE
Outputs
12
The master unit's ground establishes the ground for the entire system. The main board
ground points are connected to the shield ground at each unit, but are not connected to
earth ground. The ground point on the master can be the data converter power supply
negative terminal, or the GND pin on the RS-232 cable. If the master is an HGU, its main
board ground can be used. This configuration should only be used if the power supplies
to the units are truly floating, otherwise ground loops will be created, and differences in
local grounds may cause large currents to flow through the cable shield.
The HandReader can operate a door in two different modes: lock output and card reader
emulation. The wiring for each mode is significantly different.
In the lock output mode, the HandReader acts as an intelligent access reader signaling
a lock relay or controller to unlock the door. It also monitors the status of the door. The
decision to unlock the door is made by the HandReader after a valid verification. Users
may be assigned time restrictions to limit access during specified hours or days.
In card reader emulation mode, the HandReader outputs Wiegand (by default), magnetic
stripe, or some other card reader signal, typically to an access control panel when a user
successfully verifies. This mode makes integrating with existing access control systems
fast and simple. On retrofit applications, the existing card reader wiring can be used to
connect the HandReader to the panel if it has AWG 22 or larger conductors and is in
good condition.
The standard HandReader emulation format is for a 26-bit Wiegand card using an 8-bit
facility code. Other formats and card reader technology emulations are available. Consult
the factory for formats other than 26-bit Wiegand.
The ID number may be entered via the integrated keypad or an external card reader.
• If the user enters the ID number from the keypad, the HandReader sends the ID
number to the access panel in the specified card format with a pre-programmed facility
code.
• If the ID number is entered via the card reader, the HandReader stores the card data
and then sends the data, unmodified, to the access panel when the user successfully
verifies.
In addition to the Card Reader Emulation Output, the HandReader has two additional
programmable auxilary outputs for use with alarms and other controllers.
An open collector transistor driver drives each one of these outputs. Open collector refers
to a transistor configuration capable of sinking current (by "pulling down" one side of a
load to ground) but not able to source current – e.g. the transistor output is incapable
of supplying current to drive up the output voltage and must rely on an external voltage
source to accomplish this.
HandReader outputs, when measured to ground, generally show around 4.5 volts when
they are inactive and no load is attached. This voltage is developed by a combination
diode and series resistor pull up to the internal +5 volt supply of the HandReader. These
outputs are pulled up internally to insure that they remain in a known condition if used to
output Wiegand or magnetic stripe data to some external device.