PR611 and PR621 Installation guide Rev.B EN
2009-11-06
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Presence of two or more devices having the same address causes the communication bus conflict
and makes a proper communication with the device impossible.
Note: A new controller can be connected to the existing system without the necessity to change its
address, however only under condition that no controller existing in the system has the address
identical to the address of the newly connected device (e.g. 00). After the controller is connected to
the communication bus, it should be found in the management software and the destination address
should be assigned to it.
Power Supply
The controller requires 12V DC nominal power supply. The power should be connected to the +12V
line (positive terminal) and the GND (negative terminal). Apart from powering function, the GND
terminal plays also the role as reference potential for the RS485 bus’ communication lines, IN1-IN3
inputs and CLK/DTA interface lines.
Connecting Door Unlocking Device
In majority of cases, door unlocking devices have inductive characteristics. It means that turning off
the current flowing through the device may cause the electrical overvoltage condition which can
interfere with the controller operation. In extreme cases it may lead to the controller’s hanging up.
Moreover, the presence of overvoltages causes quicker attrition of the relay’s contacts. In order to
limit negative impact of overvoltages, it is necessary to utilize a semiconductor diode of general use
e.g. 1N4007 (one piece of such diode is delivered with the controller). It should be connected as
close as possible to the inductive element (electric strike or magnetic lock). The door lock device
element can be supplied from the same power source as the controller but for such purpose the
separate pair of wires should be used and connected directly to the power supply’s terminals.
Output Lines
All the controller’s inputs (IN1, IN2 i IN3) have identical electric structure and can be configured as
lines of NO or NC type. The NO input is triggered by applying supply minus to it, the NC input must
be normally shorted to the supply minus (GND) and is triggered by disconnecting it form the minus.
Every input is internally connected (pulled up) to the power supply plus (+12V) through a 5.6k
Ω
resistor.
Relay Outputs
The relay output REL1 offers one switched contact rated 24V/1.5A. The relay’s contacts are
internally protected against overvoltages by semiconductor elements. However this does not take
the responsibility out of the installer to eliminate interferences from inductive elements by an
additional diode. It is forbidden to use relay output to switch voltages above 30V because this for
sure will cause damage to the semiconductor elements protecting the relay’s contacts. In the normal
state (the relay is off) the NC-COM contacts are shorted. In the triggering state (the relay is on) the
NO-COM contacts are shorted. In case of lack of the power, the REL1 output is in the off state.
Transistor Outputs
Summary of Contents for PR611
Page 1: ...Installation Guide for PR611 and PR621 v1 0 Access Controllers Rev B ...
Page 11: ...PR611 and PR621 Installation guide Rev B EN 2009 11 06 Page 11 of 13 ...
Page 12: ...PR611 and PR621 Installation guide Rev B EN 2009 11 06 Page 12 of 13 ...
Page 13: ...PR611 and PR621 Installation guide Rev B EN 2009 11 06 Page 13 of 13 ...
