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Wiring RPT-485WFs
The RPT-485WFs must be used in pairs. The source EIA-485 loop can extend up to 6,000 feet and have 32 EIA-
485 devices (including the RPT-485s) hung from it. An example of wiring an EIA-485 loop using RPT-485WFs
is pictured in Figure 3-2. Notice that both ends of every loop must be terminated by a 120 ohm resistor.
Figure 3-2: Parallel/Series Connections of the RPT-485WF
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Document 15640 Rev B1 08/13/97 P/N 15640:B1
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