User guide

182N TELEKOMUNIKACE a.s., www.2n.cz
®
The functions of the LED1, LED2 and LED3 outputs are programmable.
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 4 × 4 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. If you need one button only, connect it to
the ROW1 and COL4 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.
Connection of External Loudspeaker
2N
®
Helios IP Audio Kit is equipped with an integrated 10 W power amplifier of class
D. The amplifier output is available on the SPEAKER+ and SPEAKER- terminals. The
maximum power is achievable with a 4 Ω loudspeaker only.
The higher the loudspeaker impedance, the lower the maximum power output; refer to
the table below:
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 1 m).
Lite version has a button (BUTTON) connected to the terminals COL1,
ROW4. In a default configuration, a keypad button * is configured at this
matrix position.