jobijobi
Topic Author
Posts: 12
Joined: 08 Jul 2020, 01:24

GND, Chassi GND and RS-485 GND clarification (Revpi connect)

30 Oct 2020, 15:45

Please see picture attached:

- Is 0V the same net as the GND symbol on the RS-485 connector

- Please clarify the use-cases for the chassi-gnd, i.e. when and when not to use it


Thanks
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dirk
KUNBUS
Posts: 1305
Joined: 15 Dec 2016, 13:19

Re: GND, Chassi GND and RS-485 GND clarification (Revpi connect)

16 Nov 2020, 18:03

Hi Yes, 0V (power supply) is the same net as the GND symbol (RS-485 connector).

Use this GND only if a reference potential is necessary or if the common mode range of the RS-485 drivers is exceeded (but usually the differential line pair is sufficient).

Chassis GND is functional earth, here you can connect the shield of a line.

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