IDA8 Global-Net User Manual168
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and S_ACT is open contact.
S_WD (Secondary Watching Dog Contact Inputs) / P_WD (Primary Watching Dog Contact
Inputs):
Connect the P_WD and S_WD inputs to the the Bypass Mode output on IDA8 processor. When
IDA8 enters the bypass mode, the Bypass Mode output will inform the RU units, and the RU unit
will determine whether to activate the primary IDA8 or the secondary IDA8 processor by the
monitored P_WD and S_WD contact inputs.
The basic philosophy is that the master RU unit monitors the P_WD and S_WD inputs coming
from the primary and secondary IDA8 processors and decide which one can be active, and also
passes the decision to next RU units through EXP_OUT terminal. See the table as below.
For example, when RU detects P_WD and S_WD contact are closed, it switches to the
primary.
If the RU unit is set as the slave RU unit, it monitors the S_WD which connects to the
master RU unit, resulting in setting the primary or secondary IDA8 processors to be active.
Master/Slave Switch:
A DIP switch to set RU-MAIN be master or slave. The difference between master and slave
please refer to item "(S_WD) Secondary Watching Dog".
Expansion Power Supply:
Output 24V DC power to next RU-MAIN/PDC/CTL devices.
There are two connectors of this output:
PRI: Connect to Power Supply PRI connector next RU-MAIN/PDC/CTL.
SEC: Connect to Power Supply SEC connector next RU-MAIN/PDC/CTL.
Power Supply:
24V DC power input, which is connect to 24V DC Output of IDA8C/S.
There are two connectors of this input:
PRI: 24V DC power input from primary audio processor.
SEC: 24V DC power input from secondary audio processor.
Speaker Zone Output:
There are 8 zones for speaker connection. each zone consists of following connectors (from left
to right):
P_LINEA: Connect to speaker zone output line A of primary audio processor.
P_LINEB: Connect to speaker zone output line B of primary audio processor.
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