Brainboxes CC-310 Manual descarregar pdf (Página 58)

RS422/485 Information PCI VELOCITY / OPTO ISO RS422/485

Chapter 4 Page 48

current flow due to differences in ground potential. Any one of the

methods shown in Figure 4-7, below can do this.

Figure 4-7 - Optional Grounding Arrangements For A

PCI RS422/485 Card.

Configuration A)

Configuration B)

Configuration A) The circuit common of the equipment is

connected to protective ground, at one point only by a 100

Ω, ±20% resistor with a power dissipation rating of 1/2W. An

additional provision may be made for the resistor to be bypassed

GWG

100

Ω

(

1/2

)

SG = Signal Ground Interchange circuit.

GWG = Green wire ground of power system.

= Protective ground of frame ground.

= Circuit ground or circuit

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Brainboxes CC-310 Manual Página 58