Barnett Engineering PRO TALK CV2 - Manual (Page 19)

Installation 3-3
B1272M001 BARNETT ENGINEERING LTD. ProTalk Cv2
Figure 6 +12 Volt Input Wiring
Figure 7 +5 VDC Input Wiring
Figure 9 Analog (unfiltered) Input Wiring Figure 8 Analog (filtered) Input Wiring
3.3.2 +12 volt alarm signal
The input will accept an alarm signal
that switches between 0 and +12 volts
with the wiring arrangement shown in
Figure 6.
If the signal switches between +12 volts
and an open circuit, as in the case of a
relay contact, the ‘B’ terminal must be
connected to ground to ensure that the
logic level goes to ground when the
voltage is removed.
3.3.3 +5 volt alarm signal
Figure 7 shows how an alarm signal that
switches between +5 volts and ground is
wired. If the alarm signal does not have a
true ground level, terminal ‘B’ must be
connected to ground.
3.3.4 Analog input (Advanced mode)
For analog signals, either of the wiring configurations shown in Figures 8 and 9 can be used.
The connection shown in Figure 8 will provide additional filtering of the signal.