On 2018-02-02 7:13 PM, Fred Cisin via cctalk wrote:
they might have different ground systems. If so, grounding both ends might produce a LARGE current through the cable, possibly enough to be hazardous.

OB_Ignorant_Question:  Is that the reason why RS232 DB25 has both pin 1 and pin 7?
Pin 1 is supposed to be protective (shield) ground and pin 7  is signal ground.


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