IDTECK LX006, Руководство пользователя

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p.16 CHECK POINTS DURING INSTALLATION
2.2 HOW TO CONNECT TERMINATION RESISTORS
2.3 GROUNDING SYSTEM FOR COMMUNICATION CABLE
We recommend proper grounding system on the communication cable. The best method fo
r grounding system is to put the shield wire of the communication cable to the 1st class eart
h grounding; however it is not so easy to bring the earth ground to the communication cabl
e and also the installation cost is raised. There will be three grounding point where you can f
ind during installation;
1, Earth Ground 2. Chassis Ground 3. Power Ground
The most important point for grounding system is not to connect both ends of shield wires t
o the grounding system; in this case there will be a current flow through the shield wire whe
n the voltage level of both ends of shield wire is not equal and this current flow will create n
oise and interfere to communications. For the good grounding, we recommend you to conn
ect ONLY one end of shield wire of communication cable to grounding system; If you find e
arth ground nearby, connect one end of shield wire to earth ground; If you do not have eart
h 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 wir
e to power ground. (GND of LX006/SR).
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 t
his case we recommend you to use power ground instead of chassis ground.