How to correct the panel reporting PT BUS TROUBLE after the D8128A is connected.
An Octopopit addressed for points 65-71 or 129-135 has the dip switch for zone 8 turned on and the zone is shorted. Set dip switch 8 to off on these Octopopits.
Zones 72 and 136 are reserved for monitoring the Zonex Data Expansion Loop.
When adding a D8128A for use with points 65-71 (D7212B or B1), setting switch 8 to on enables zone 72.
When adding a D8128A for use with points 129-135 (D9112B or B1), setting switch 8 to on enables zone 136.
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