System Products 167
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If this indicator light up, it means there is an error of the unit, user needs to check wiring of
S. WD connector or replace by a good unit.
Power Indicator:
This LED lights up if this unit is power on.
3.3.1.2 Rear Panel
PDC Audio Output for Record:
The audio output of peripheral plugged on PDC connector.
PDC Connectors:
There are 2 sets of PDC port in RU-Main, each set consist of three connectors, allow system to
do one PDC peripheral redundancy, the "N" is the number of set:
P_PDC N: Connect to one of primary audio processor's PDC connectors.
PDC N: Connect to peripheral which communicates to audio processor using PDC
interface, for example PSS AS, PPM AS.
S_PDC N: Connect to one of secondary audio processor's PDC connectors.
Zone Amplifier Inputs:
There are 8 sets of Zone Amplifier Input in RU-MAIN, each set consist of three connectors, allow
system to do one channel of zone amplifier redundancy, the "N" is the number of set:
P_ZONE N: Connect to Nth channel of primary audio processor's zone amplifier input
connector.
ZONE N: Connect to Nth channel of normal amplifier's audio input connector.
S_ZONE N: Connect to Nth channel of secondary audio processor's zone amplifier input
connector.
EXP_OUT (Active Control Expansion Output):
This port output logic signal to next RU devices to synchronize redundancy state which tells
primary or secondary is active.
Fault:
This port is a logic contact, which is normally closed, opened if the unit is set to be slave (refer
to Master/Slave Switch of later item), and a short or open is detected on S_WD (Secondary
Watching Dog) port.
S_ACT (Secondary Active Contact Output) / P_ACT (Primary Active Contact Output):
The S_ACT and P_ACT contact outputs will inform the external device whether the primary or
secondary is active.
For example, when the RU status switches to the primary, the P_ACT is close contact,
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