Contemporary Control Systems BASgatewayLX - Manual (Page 8)

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For devices that do not share power with our product, see Figure 7 for proper 2-wire
bus connections and Figure 8 for proper 3-wire bus connections.
Figure 9 — 2-wire EIA-485 Bus with Separate Power Source
Figure 10 — 3-wire EIA-485 Bus with Separate Power Source