I have a confusion on whether in RS485 common ground is required or not?
I have a slave side & a master side.
As far as I understand when master & slave communicate, there is no reference to ground of each other. They communicate with referene to A&B.
Communication is:
Slave(with gnd1)->SN65HVD70(RS485) ---- SN65HVD70(RS485)<-Master(with gnd2)
1. I think there will be no connection between gnd1 & gnd2. Or there is any relation?
2. Infact I had made a system some 3-4 years ago, I had communication like above between two devices. Both devices have their own ground, no reference with each other. They were communicating with each other on A/B signals only.
I have a slave side & a master side.
As far as I understand when master & slave communicate, there is no reference to ground of each other. They communicate with referene to A&B.
Communication is:
Slave(with gnd1)->SN65HVD70(RS485) ---- SN65HVD70(RS485)<-Master(with gnd2)
1. I think there will be no connection between gnd1 & gnd2. Or there is any relation?
2. Infact I had made a system some 3-4 years ago, I had communication like above between two devices. Both devices have their own ground, no reference with each other. They were communicating with each other on A/B signals only.
