Power/Reference Wiring For Multiple Rpt-485S - Pittway Notifier RPT-485W Manual

Figure 5-3: Power/Reference Wiring for Multiple RPT-485s
NOTE: Most EIA-485 devices and sources manufactured by Notifier are not isolated. When making refer-
ence connections to non-isolated EIA-485 devices powered by separate power supplies, care must be taken
to ensure that only one power supply has Earth Fault detection enabled within a group of power supplies
sharing the same reference connection.
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All EIA-485 loops in this
Figure are isolated from
each other.
Document 15640 Rev B1 08/13/97 P/N 15640:B1
17