Contemporary Control Systems BASgatewayLX - Manual (Page 7)

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For devices that share a power source with our product, see Figure 5 for proper 2-wire
bus connections and Figure 6 for proper 3-wire bus connections.
Figure 7 — 2-wire EIA-485 Bus with Shared Power Source
Figure 8 — 3-wire EIA-485 Bus with Shared Power Source