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Allen Bradley 1764-LRP NEW ORIGINAL 1764LRP

 The data lines (422R+/485+ and 422R-/485-) and signal ground (SIG GND) must be properly connected as shown. In addition, the shield (SHLD) should be connected in at least one location. The last unit in the Modbus network chain, and only the last unit, should have it’s receiver terminated with a resistor. The 505E control has termination resistors built-in, see the jumper option chart (Table 2-1) to connect the termination resistor.   

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