Installation and Reference Manual
Technical Data
Installation and Reference Manual v3.2/0410/6 331
External event inputs are provided using 4 pin mini DIN connectors that have the following pin out:
View looking into socket.
1 Limited power source return
2 Signal detect -
Limited power source feed (5V)
6 Chassis connection
7 Chassis connection
Pins 5, 6 & 7 are contacts that connect the shield of the mating mini DIN plug to the unit chassis.
The input is an opto-isolator that detects current between pins 4 and 2.
It can be used in one of two modes:
In this mode the external power source is switched across pins 4 and 2 by the external event, e.g. a
mechanical switch on a door entry system.
The input is isolated from the chassis and has the following specification:
Absolute Maximum Voltage = 60V. Beyond this, damage will occur.
Recommended Maximum Voltage = 48V.
Input impedance = 1000 Ohms.
Recommended on current > 3mA.
Recommended off current = 0mA.
To activate the opto-isolator pin 4 should be at a higher voltage than pin 2. No damage will occur if the
voltage polarity is reversed, however no event will be detected.
For convenience a limited power source is provided on pins 3 and 1. This can be used to drive the opto-
isolator using a switch in series to gate the current to the opto-isolator. Alternatively pin 1 can be
connected to pin 2 and pin 3 to pin 4 and a switch used between pins 4 and 2 to short out the power
source.
Power Source open circuit Voltage = 5V
Power Source impedance = 2000 Ohms
No damage will occur to the power source if it is shorted out.
The power source should not be used for any other purpose.
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