Technical Manual
FT420
– Iss 2.4
49
3.9.5 Auxiliary Audio Inputs
The CIE OWS provides an Auxiliary Audio Input and a Supervised Auxiliary Enable Input. The
Auxiliary Audio input can be connected to the background music or a remote desktop microphone.
When the CIE is in quiescent conditions and the auxiliary enable input is activated, the auxiliary audio
is activated and remote PA announcement or background music will be broadcasted across the
speakers.
Shielded cables should be used for Audio signals and its shielding should be connected to the CIE
EARTH terminal.
The auxiliary input requires a 47K
Ω End of Line resistor connected across the auxiliary switch input
and a second 47K
Ω resistor in series with the enable switch as shown in Figure 26.
+
-
-
+
EOL
47K
ACTIVE
47K
FROM AUDIO
EQUIPMENT
AUXILIARY
AUDIO INPUT
AUXILIARY
SWITCH INPUT
Figure 26 OWS Auxiliary Input Circuit
3.9.6 OWS Dual Strobe Output
The OWS Dual Strobe output circuit is shown in Figure 27. A small current flows through one of the
two strobes constantly, which is normally too small to activate the strobes in normal conditions. The
EOL resistor of the output is normally 47K
Ω. However, the EOL resistance may vary based on the
strobe model connected. Strobe models may be limited.
Figure 27 Typical OWS Dual Strobe Control Circuit
