PR302 v1.0 Installer Manual EN Rev. B.doc 8/19/2008
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Inputs
The PR302 offers three programmable inputs (IN1, IN2 and IN3). All of them have the same
electrical structure and can be configured as NO or NC line. Each input is internally biased to supply
plus (+12V) through 5.6kΩ resistor what makes that supply plus is observed on the free (not
connected) input. The NO type input goes active when shorted to supply minus (GND). The NC line
in normal state should be connected to GND, it became triggered when connection with GND is
discontinued.
Relay output
The PR302 has one programmable relay output (REL1) which offers single NO/NC/COM contact
24V/1.5A rated. In normal state NC contact is shorted to COM wile NO remains isolated. When
active, NO is shorted to COM while NC remains isolated. When controller is not supplied or supplied
with voltage below its minimum level, relay output remains not active.
Transistor outputs
There are two transistor outputs (IO1 and IO2) available on the PR302 controller, both have
identical electrical structure. When not active (normal state) transistor outputs represent high
impedance, when active (triggered state) outputs short to supply minus (GND). Each output can
switch max. 1A DC while voltage connected to it must not exceed 15V DC. The IO1 and IO2 have
internal over-current protection which switches them off for currents above 1A.
Communication bus
The communications bus consist of three lines: A, B and cable’s shield (SHLD). Electrically, it
represents RS485 standard however neither the daisy chain structure nor terminating resistors are
required. Instead of this free topology of communication bus is allowed, the A/B wires can be laid
down using “three’’, “star” or any combination of them. It is recommended to use UTP cable for A
and B lines however other types of signal cables are accepted as well. The use of shielded cables
should be limited to these installation were strong electromagnetic interferences are expected.
The max. cable distances:
• between communication interface and any controller on the bus: 1200m
• between communication interface and CPR network controller (if installed): 1200m
• between any access controller and CPR network controller (if installed): 1200m
When longer cable lengths are required the UT-3 (RS485/RS422 repeater) or UT-4 interfaces can be
used. Using link built from two UT-3 units communication distance can be extended by 1200m while
using UT-4 serial-to-ethernet converter distance is limited to area covered with computer network.
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