CPR32-SE v2.0 EN Rev.B.doc
3/27/2010
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Charging current adjustment
When required, battery charging current can be adjusted in 100-500mA range. In order to set
required charging current connect battery (which is partly discharged) to CPR32-SE and then using
screwdriver rotate POT1 potentiometer and observe current which flow into battery. Charging
current should be observed using multimeter connected in series with battery plus or minus.
Note: It is forbidden to set battery charging current below 100mA level because in this case
charging current is not guaranteed.
RS485 communication bus
The RS485 serial communications interface in CPR32-SE consist of three terminals: A, B and SHLD.
The A and B are signal line while SHLD is used to connect cable’s shield (if used). Electrically,
communication bus standard represents RS485 however there are two important modification in
respect to typical RS485:
•
Daisy chain structure is not obligatory (free topology is allowed)
•
Terminating resistors on both ends of bus are not required
•
Any type of signal cable is accepted
Generally, free topology of communication bus is allowed, comm. bus cables can form “three’’, “star”
or any combination of them however closed loops are forbidden. It is recommended to use UTP
cable for A and B lines nevertheless any type of signal cables is accepted as well. The use of
shielded cables should be limited to these installation where strong electrical interferences are
expected.
The maximum distance of communication must assure two conditions:
•
The max. cable run between CPR32-SE module and any access controller or communication
interface must not exceed 1200m
•
The max. cable run between communication interface and any access controller or CPR32-SE
module communication interface must not exceed 1200m
For longer communication distances it is possible to use UT-3 or UT-4 interfaces. Using two UT-3
units communication distances can be extended by next 1200m, while for UT-4 distance is not
limited because it uses computer network.
Inputs
CPR32-SE offers four programmable inputs (IN1, IN2, IN3 and IN4). All of them have the same
electric structure and can be configured as NO or NC. Each input is internally biased to supply plus
(+12V) through 5.6k
Ω
resistor, this makes that +12V is observed on the not connected (floating)
input.
The NO type input goes active when shorted to supply minus (GND), if input is left unconnected or
shorted to +12V it represents passive (normal) state.
The NC line in passive (normal) state should be connected to supply minus (GND), it becomes active
(triggered) when connection with GND is discontinued. If input is left unconnected or shorted to
+12V it is in active (triggered) state.
Note: If required, inputs can be connected together - still they can be programmed to different
functions.
Relay outputs
CPR32-SE has two, programmable, relay outputs (REL1 and REL2). Each of them offers one
NO/NC/COM contact rated 24V/1.5A with built-in voltage surge protection.
