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  1. We have an RS485 based communications issue We are using a Unitronics V430-J-RH6-N to communicate to a network of up to 4 slaves, consisting of Ziehl-Abegg Modbus modules. The ZA module wiring requires that, in addition to the data lines, the ground connections also be daisy chained together. This is what I am used to. The Unitronics communications connector does not specify a ground connection on the 6 pin RS12 connector provided. They only mention using pins 1 and 6 for Data A and B. 1. Where at the PLC do I terminate the ground for the RS485 circuit? Currently we have it tied to chassis. 2. Is there a possibility that tying the V0 ground at the PLC to Chassis, as suggested in the Unitronics documentation, could be causing us issues? The ZA socuentation specifically mentions NOT to connect the shield on the cable.
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