[SI-LIST] Necessity of Ground signal for RS485 transmission at 500 ft cable length

Hi All,
            Can someone comment on the need of separate Ground Signal
Wire in addition to the standard 2-wire RS485 Connections between the
Master and Slave device. I have come to know that separate Ground wire
b/w the two devices communication via RS485 at higher baud rates and
increased cable length improves signal transmission.
Regards,
Adeel Malik

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