參數(shù)資料
型號(hào)： 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(yè)數(shù)： 35/44頁(yè)
文件大?。?/td> 628K
代理商： RS-485
32
RS-422/485 Application Note
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 434-7094
Table 4.1 Comparison of Protection Techniques
Optical Isolation
Requires no ground reference
Adds no loading to data lines
Shunting
Must have low impedance ground path
Presents additional capacitive loading to
data lines
Lower complexity, uses passive components
Effective on both common and differential
mode transients
Can be improperly installed by user
Higher complexity
Effective on common mode
transients
Not dependent on installation
quality
Requires an external power source
Not affected by long term or
continuous transients
No power required
Subject to damage by long duration
transients
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