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.
Paul.