CPR32-SE-BRD v3.0 User Manual
2020-10-08
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General guidelines for 18VAC power supply
GND terminals of CPR and access controllers must be connected with any wire.
CPR and access controllers can operate with directly connected backup batteries.
CPR and access controllers cannot be started using only power supply from backup battery.
General guidelines for 12VDC power supply
Negative (GND) potentials of power supply units must be connected with any wire.
It is not necessary to connect GND terminals of CPR and PR controllers.
Connect CPR/controller and power supply unit with separate wire. The wire section must be
such as to prevent more than 0.5V voltage drop between CPR/controller and unit at maximal
load.
It is recommended to install CPR/controller possibly close to power supply unit, preferably in the
same room.
Backup batteries cannot be connected directly to CPR/controllers thus backup supply must be
ensured on power supply unit side.
CPR/controllers can be supplied from single power supply unit if the output power is sufficient.
3.4 Communication with CPR
RS485 bus and UT communication interface (e.g. UT-2USB) are used for communication with
CPR32-SE-BRD v3.0 network controller. Single RS485 bus creates network (subsystem) including
single CPR32-SE-BRD v3.0 unit and up to 32 access controllers. For the communication with distant
subsystems it is required to use UT-4DR or UT-4 v2.0 communication interface as both enable
communication through computer network (LAN or WAN).
The RS485 bus consists of two signal lines A and B. In the RACS 4 system any topology can be
used (star, tree or any combination of them, except for loop) in order to connect controllers in
network (subsystem). The matching resistors (terminators) connected at the ends of transmitting
lines are not required. In most cases communication works with any cable type (standard telephone
cable, shielded or unshielded twisted pair etc.) but the recommended cable is unshielded twisted
pair (U/UTP cat.5). Shielded cables should be limited to installations subject to strong
electromagnetic interferences. The RS485 communication standard used in the RACS 4 system
guarantees proper communication in a distance of up to 1200 meters as well as high resistance to
interferences.
3.5 Input and output lines
Functions are assigned to inputs and outputs by means of PR Master software. Lists of available
functions are specified in tables 4 and 5.
3.5.1 Inputs
All inputs (IN1..IN8) of CPR have identical electric structure and can be configured as NO or NC
lines using PR Master software. The NO input is triggered by shorting it to supply minus (GND)
while the NC input must be normally shorted to supply minus (GND) and it becomes triggered when
connection with GND is interrupted. Every input is internally connected (pulled up) to the power
supply plus (+12V) through a 15kΩ resistor.
3.5.2 Relay outputs
CPR offers two relay outputs (REL1, REL2), each with single switching contact. Maximum load for
REL1 equals to 30V/1.5A while maximum load for REL2 equals to 230VAC/5A and also 30VDC/5A.
In the normal state (relay is off) the NC-COM contacts are shorted. In the triggering state (relay is
on) the NO-COM contacts are shorted. In case of power outage both relays remain in the off state.
3.5.3 General purpose outputs
CPR offers four transistor outputs (IO1, IO2, CLK, DTA). All outputs are open collector type i.e. in
normal (off) state are pulled to supply plus via 15kΩ resistor and when in trigger (on) state they
short to supply minus. Maximum load for each output equals to 15VDC/1A. In case of overcurrent,
outputs are automatically switched off and CPR automatically restarts.
