Bacharach LonWorks FT-10 - Manual (Page 3)

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If an RDM800 remote display IS to be used with the adapter, refer to Figure 3 for wiring
details. Note that when the RDM800 is used, TWO RS-485 cables must be run between
the HGM300 and RDM800, so plan accordingly.
In either case, be sure to set the HGM300’s internal “Terminator” slide switch next to the
RS-485 terminal block to the “In” position.