Johnson Controls tyco Power Pro Series Reference Manual page 32

Section 2: Installation
Figure 2-20 HSM3408 8-Zone Expansion
Refer to the HSM2108 and HSM3408 installation sheets for more information.
2-Way Audio Module
The HSM2955 2-way audio module provides Talk/Listen-in capability for the audio verification of alarms.
The main alarm controller has a 3-pin analog audio link interface to connect the module.
Figure 2-21 HSM2955 2-Way Audio Module
Output Expander
The HSM2208 module is used to add up to 8 low-current programmable outputs to the alarm system.
The 4-wire Corbus connection is used by the panel to communicate with the module. Connect the RED, BLK, YEL and GRN
terminals to the Corbus terminals on the alarm panel. Board current draw: 40mA.
Figure 2-22 HSM2208 Output Expander
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