Digicom Pocket AL I/O, User Manual

Page: 10 / 36

2.2
Pocket AL I/O Installation
Non optoinsulated Digital Inputs
Two status are supported for each non optoinsulated input: open or closed to ground. It is necessary
to connect a free contact only (without voltage) between the input pin and the ground pin.
It is not necessary to give voltage to inputs.You can use 1 and 6 GND ground pins present on 20
pins terminal board.
DIGITAL INPUTS FEATURES
Supported status :
- Input open
- Input closed at ground (GND)
Open Collector outputs
The four Open Collector outputs of Pocket AL I/O allow the control of the devices that can be enabled and
disabled when a switch is closed (i.e. Light, Alarm, Logic port, etc.).
When connecting your devices, keep into consideration the maximum voltage that can be applied between
the collector and the emitter (Vce) of the Transistor and the maximum current that can pass through the
collector circuit (Ic):
Vce (max) Ic (max)
60V 700mA
You can use 1 and 6 GND ground pins present on 20 pins terminal board.
Connection examples
If with the output you want to manage a simple led (1,5V – 20mA) and you have at your disposal a 12V power supply, then you
will have to insert a pull-up resistor of 470
Ω
to limit the current.
If you want to control the 230V bulb through the open collector output of Pocket AL I/O, you must connect to Pocket AL I/O an
external relay and a protection diode for the internal transistor. In this case it is necessary to build a little external circuit inserting
a 1N4007 or 1N4148 diode and then to connect a proper relay.
NOTE: if an extension cable is needed to reach the relay, insert the protection diode as security for the
transistor.
GND
GND
pin
O.C.
pin
GND
c
b
e
R
led
12V
POCKET
12V
230Vac
1N4007
Rele
GND
GND
pin
O.C.
pin
GND
c
b
e
POCKET
in pin
GND pin
GND
POCKET
GND
GND
pin
O.C.
pin
c
b
e
POCKET