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Allen Bradley 1794-OA8 Warranty One Year 1794OA8

All three 505E communications ports are fully isolated from earth ground. The RS-422 and RS-485 specifications state that a ground wire is needed if there is no other ground path between units. The preferred method to do this for isolated ports is to include a separate wire in the ground cable that connects the circuit grounds together. Connect the shield to earth ground in at least one location, see Figure 2-13a. 

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