How To Connect Termination Resistors; Grounding System For Communication Cable - IDTECK LX006 User Manual

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6.2.2 HOW TO CONNECT TERMINATION RESISTORS

(Figure: Termination resistors for 2 wire RS485 communication system)

We recommend proper grounding system on the communication cable. The best method for grounding

system is to put the shield wire of the communication cable to the 1

is not so easy to bring the earth ground to the communication cable and also the installation cost is

raised. There will be three grounding point where you can find during installation;

1, Earth Ground

The most important point for grounding system is not to connect both ends of shield wires to the

grounding system; in this case there will be a current flow through the shield wire when the voltage

level of both ends of shield wire is not equal and this current flow will create noise and interfere to

communications. For the good grounding, we recommend you to connect ONLY one end of shield wire

of communication cable to grounding system; If you find earth ground nearby, connect one end of

shield wire to earth ground; If you do not have earth ground nearby, find chassis ground and connect

one end of shield wire to chassis ground; If you do not find both earth ground and chassis ground, then

connect one end of shield wire to power ground. (GND of LX006).

Note that if the chassis ground is not properly connected to the earth and floated from the ground level,

then grounding to the chassis ground will make the worst communication; in this case we recommend

you to use power ground instead of chassis ground.

2. Chassis Ground

(Figure: Grounding system)

class earth grounding; however it

3. Power Ground

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