iFocus DVRA+/B+/E+ Manual Version 4.2
Page 7 of 40
5.2
External IR Receiver Connections
Figure 5 illustrates the connection between a DVR and an
external IR receiver. The maximum length of the wire
connected is 100m.
The terminals are on the back panel of the DVR. IR+ goes
to the red wire of the external IR and IR- the black wire of
it.
5.3
Audio Camera Source and Speaker
iFocus DVR supports audio Recording and Playback on Channel 1 and 2.
5.3.1 Hardware Setup
The Audio feature requires the following devices:
a.
A camera with audio recording feature or a separate audio microphone
b.
A mono to stereo splitter
c.
A speaker
Before connecting all the devices, differentiate the channel connection of the splitter
first.
Steps as follow:
a.
Turn a digital multi-meter to enable the short-
circuit-beeping function
b.
Use the meter to measure the resistance between
one of the RCA connectors and the head portion
of the splitter indicated as “Channel 1” below
c.
If the meter beeps, this RCA is for Channel 1, the
other for Channel 2
d.
Otherwise, this RCA is for Channel 2, the other
for Channel 1
IR+
IR-
T1
T2
Gnd
P1
P2
Gnd
P3
P4
Figure 5: Connection, External IR
Channel 1
Channel 2
Figure 6: Mono to Stereo Splitter
