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參數(shù)資料
| 型號： | RS-485 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | RS-422 AND RS-485 APPLICATION NOTE |
| 中文描述： | RS - 422和RS - 485接口應(yīng)用筆記 |
| 文件頁數(shù)： | 33/44頁 |
| 文件大?。?/td> | 628K |
| 代理商： | RS-485 |
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RS-422/485 Application Note
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 434-7094
Figure 4.7 Isolated node with shunt protection to earth ground
Figure 4.8 Isolated port with ungrounded shunt protection
The method shown in Figure 4.7 is recommended, in this case isolation
protects the circuit from any voltage drops in the earth ground connection. The
shunt devices will prevent a surge from exceeding the breakdown voltage of the
isolators as well as handling any differential surges on the cable. Figure 4.8
illustrates a method recommended for cases where there is no way to make an
earth ground connection. Here, the shunt device’s function is to protect the
port from differential surges, a differential surge will be balanced between
conductors by the shunting device, converted to common mode. The isolation
provides protection from the common mode transient remaining.
Isolated Power
Device
Vcc
Port
Earth Ground
Ground line
Shunting Device
Data Lines Out
Shunting Device
Device
Isolated Power
Vcc
Port
Signal Ground
Data Lines
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