2N Helios IP Video Kit - Manual (Page 19)

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2N TELEKOMUNIKACE a.s., www.2n.cz
®
Connection of External Microphone
2N
®
Helios IP Video Kit is equipped with an input for connection of an external
electret microphone on the MIC+ and MIC− terminals. Shielding of the shielded cable
is connected to the IN- terminal.
Connection of External Amplifier
2N
®
Helios IP Video Kit is equipped with a line output for connection of an external
power amplifier on the LINE OUT+ and LINE OUT- terminals.
Connection of External Audio Source
2N
®
Helios IP Video Kit is equipped with a line input for connection of an external
audio signal source (FM tuner, MP3 player, e.g.) on the LINE IN+ and LINE IN-
terminals.
Connection to Relay Output
is equipped with one galvanically isolated relay switch with N/O and N/C contacts on
the NC, NO and COM terminals. The relay function is programmable.
Caution
Never connect a loudspeaker with impedance lower than 4 Ω to avoid
system damage.
Never exceed the maximum power output designated for the loudspeaker
to avoid loudspeaker destruction. Choose a loudspeaker with proper
impedance and maximum power values, or limit the maximum volume
level in the device configuration.
Caution
Undesired noise may be heard in the earphone where EMI affects the
microphone signal. To avoid this, connect the microphone using a shielded
cable of the minimum possible length.