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Two RPT-485Ws In Series Configuration
In order to further extend the EIA-485 loop, 2 RPT-485s can be arranged in a series connection. Between the
two RPT-485s, 32 EIA-485 devices, 32 RPT-485s, or a combination of both can be hung from the loop. 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-485Ws is pictured in Figure 2-2. Notice that
both ends of every EIA-485 loop must be terminated by a 120 ohm resistor and there cannot be more than 2
RPT-485s connected in series.
Figure 2-2: Parallel/Series Connection of RPT-485Ws
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Document 15640 Rev B1 08/13/97 P/N 15640:B1
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