2N Helios IP Installation Manual - page 19
Electric Installation
2.3
16
mentioned limit (12W for PoE). If the PoE supply fails to provide sufficient
power for the specific application, use a more powerful external source to
make your device work perfectly.
Connection of LED Indicators
2N
®
Helios IP Audio Kit is equipped with three independent current LED control
outputs (LED1+-, LED2+- and LED3+- terminals). All of them are current outputs
(20mA, up to 12V). You can connect the LEDs directly to the terminals of these
outputs or use LEDs with serial resistors. Mind the polarity while connecting the LEDs
to make your device work properly.
The functions of the LED1, LED2 and LED3 outputs are programmable; refer to the
2N
®
Helios IP Configuration Manual for details.
Connection of Keypad/Buttons
2N
®
Helios IP Audio Kit is equipped with an interface for connection of an external
matrix keypad or up to 16 separate buttons; see the figure below:
The buttons are connected in a 4x4 matrix to the ROW1-4 (output) and COL1-4
(inputs) terminals. If you do not make use of all of the 16 buttons, you can leave
some of the ROW and COL signals unconnected. For example, if you need one button
only, connect it to the ROW1 and COL1 terminals.
The button function is programmable. You can set the numerical keypad buttons to
any matrix position (0 to 9, *, #) or configure one of the 16 buttons for dialling a
telephone directory position. Refer to the 2N
®
Helios IP Configuration Manual for
details.
Caution
Errors such as false keystroke detection may occur in installations with
strong EMI. Therefore, make sure that the keypad or button cables are
carried in a trunk separated from the power cables and are as short as
possible (up to 1m).
ROW1
ROW2
ROW3
ROW4
COL1 COL2 COL3 COL4