Advantech RS-485 user manual ‘Frame Ground’ and ‘Grounding Bar’, Figure F-2 Grounding Bar

Grounding Reference

1.2 The ‘Frame Ground’ and ‘Grounding Bar’

N

G

G

	N
N	Single Phase, Three Line
	L	110V
	N
		220V
		110V
	L
	G
	G

Neutral is the physical cable from Generator. Ground is the local physical cable that connected to Ground Bar .

Figure F-2: Grounding Bar.

According to previous description, the grounding is the most impor- tant issue for our system. Just like ‘Frame Ground’ of the computer, this signal offers a reference point of the electronic circuit inside the computer. When we want to communicate with this computer, not only ‘signal ground’, but also ‘frame ground’ should be connected to make a reference point of each other’s electronic circuit. Generally speaking, it’s necessary to build a individual grounding bar for each system, such as computer networks, telecommunication networks, power system, . . . , etc. Those individual grounding bars not only provide the individual reference point, but also make the earth as a real ground!

F-4 ADAM-5000