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Audio Command Center Series Manual — P/N 51889:E1  6/8/2010
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ACC-ZSM Zone Splitter Module (ACC-25/50ZS & ACC-25/50ZST)
Field Programming
2.8.2  S2 and S3 Addressing Rotary Switches
Two addressing switches are located at the bottom right of the ACC-ZPMK Zone Page Module.  
The switches are used to set the ACS (EIA-485) address of the ACC-ZPMK to allow communica-
tion between it and the FACP.  This communication link allows the FACP to control speaker zones 
under program control.
The ACC-ZPMK must be set to address 01 to communicate with the FACP.  To set the address, use 
a small nononductive flat-blade screw driver to turn the switch dial so the arrow points to the cor-
rect address number. The factory default setting is S3 = 0 and S2 = 0.  The following illustration 
shows the switches set for address 01 with S3 (Tens) set to 0 and S2 (Ones) set to 1.
2.9  ACC-ZSM Zone Splitter Module (ACC-25/50ZS & ACC-
25/50ZST)
Two switches on the ACC-ZSM Zone Splitter Module are used to configure the speaker circuits 
connected to it.
SW1 - used to configure the circuits for split amplifier application.  Setting the switch to the 
AAM 1 & 2 position directs the audio from Amplifier 1 to the first two Class A circuits or first 
four Class B circuits, and the audio from Amplifier 2 to the next two Class A circuits or next 
four Class B circuits.  Setting the switch to the AAM1 position sends the audio from Amplifier 
1 to all circuits.
SW2 - used to configure all circuits for Class A (Style Z) or Class B (Style Y) operation. 
Figure 2.3  ACC-ZPMK Addressing Switches
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SW1, which is shown in the AAM 1 & AAM 2 
position is set for split amplifier operation.  
Note that the factory default setting is AAM1 
only for single amplifier operation.
SW2, which is shown in the Class B position, 
configures all circuits for Class B (Style Y) 
wiring.  This is the factory default setting.
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