PCI 1 Port RS422/485
Software Setup
Chapter 3 Page 62
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
with a strap to connect signal common and protective ground
directly together when specific installation conditions necessitate.
GWG
SG
GWG
100
Ω
(1/2)
SG
SG
=
Signal Ground Interchange circuit.
GWG =
Green wire ground of power system.
=
Protective ground of frame ground.
=
Circuit ground or circuit
