User manual
74-Channel H.264 Network Video Encoder
SECTION 2: INSTALLATION AND SETUP
Ain
Grounds
Ground
Common
Aout 1 - 4 DO 1 - 4
Aout
Grounds
Ain 1 - 4 DI 1 - 4
RS-232
TX, RX, Gnd
RS-485
DATA+, DATA-, Gnd
Terminal block pin assignments
2.4.1 Audio in/out connections (Ain, Aout, channels 1 - 4)
The encoder includes an interface for a mono audio input (from a microphone) and a mono audio output (to a speaker) for each
channel. The audio output is a low level signal that requires an amplied speaker (see Specications).
To connect a speaker and/or microphone to the encoder:
1. Route speaker and/or microphone wiring to the encoder.
2. Strip 1/4” of insulation from the wires speaker signal and ground wires and insert them into the lower 6-pin terminal block
on the Aout and Aout Ground pins, respectively.
3. Strip 1/4” of insulation from the microphone signal and ground wires and insert them into the upper 6-pin terminal block on
the Ain and Ain Ground pins, respectively.
2.4.2 Sensor in connection (DI, channels 1 - 4)
The encoder provides four input channels for sensors, one for each channel. The sensors can be either all voltage or all relay type
sensors. For voltage type sensors, see Specications for allowable voltage levels. The conguration of each sensor input wiring is
illustrated in the diagrams below.