What is the maximum number of devices on the 6820 SLC loop, and how do I expand capacity with a 6815 SLC expander?
The 6820 built-in SLC loop supports up to 159 System Sensor (SK) detectors and 159 SK modules, or 127 Hochiki (SD) protocol devices (Page 1) [10].
The system can be expanded to a maximum of 1,110 SK points or 635 SD points (Page 1) [16].
Each 6815 SLC expander adds 159 SK sensors and 159 SK modules, though it only supports SK protocol devices (Page 12) [6].
To expand capacity with a 6815:
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Ensure power is removed from the control panel (Page 42) [1].
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Mount the 6815 in the 6820 cabinet, 5895XL cabinet, or 5815RMK remote mounting kit (Page 42) [1].
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Connect the 6815 to the FACP via the SBUS (Page 42) [1].
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Use the onboard DIP switches to select a unique SBUS ID# (Page 42) [1].
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Add the module to the system using JumpStart or manual programming (Page 42) [1].
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Connect the SLC devices to the 6815 loop terminals (Page 42) [1].