Samsung SSA-S2100/EXP manual EARTH-GROUNDING the Communication Cables, Host PC

Models: SSA-S2100/EXP

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installation and external connection

EARTH-GROUNDING THE COMMUNICATION CABLES

We recommend you to use a proper grounding system for the communication cables.

The best grounding method is to earth-ground the shield wire of the communication cable. However, earth-grounding the communication cable isn’t that easy, apart from the cost increase.

There are three grounding points available for installation:

1.Earth Ground

2.Chassis Ground

3.Power Ground

The most important thing about the earth-grounding is not connecting both ends of the shield wire to the same grounding system; Connecting both to the same end will cause a current flow through the shield wire due to the voltage level difference between the both ends of the shield wire, and this current flow will introduce some noise and interference to communications.

We recommend you connect ONLY one end of the shield wire of the communication cable to the grounding system. If you can locate an earth grounding point nearby, connect one end of the shield wire to that point.

If you could hardly locate an earth grounding point nearby, connect one end of the shield wire to the chassis ground point. If you could locate neither of an earth or chassis grounding point nearby, connect one end of the shield wire to the power ground point (GND). Note that if the chassis is not properly earthed and floated from the ground level, then grounding communication cable to the chassis will produce the worst communication. If this is the case, use the power grounding point rather than the chassis grounding.

 

RS-485/RS-232

Communication

 

Converter

RS-232

Wires

 

ShieldWire

ConnectOpen

HOST PC

Earth Ground

or Chasis Ground or Power Ground

 

 

 

 

 

 

RS-485

 

 

 

 

 

RS-485

 

 

 

 

 

RS-485

 

 

 

 

 

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GND

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GND

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GND

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GND

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Page 16
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Samsung SSA-S2100/EXP manual EARTH-GROUNDING the Communication Cables, Host PC