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參數資料
| 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接口應用筆記 |
| 文件頁數： | 2/44頁 |
| 文件大小： | 628K |
| 代理商： | RS-485 |
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RS-422/485 Application Note
Table of Contents
i
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 434-7094
Table of Contents
CHAPTER 1: OVERVIEW
...........................................................................1
I
NTRODUCTION
.............................................................................................1
D
ATA
T
RANSMISSION
S
IGNALS
......................................................................1
Unbalanced Line Drivers.........................................................................1
Balanced Line Drivers.............................................................................1
Balanced Line Receivers..........................................................................3
EIA S
TANDARD
RS-422 D
ATA
T
RANSMISSION
..............................................3
EIA S
TANDARD
RS-485 D
ATA
T
RANSMISSION
..............................................6
T
RISTATE
C
ONTROL OF AN
RS-485 D
EVICE USING
RTS..................................9
S
END
D
ATA
C
ONTROL OF AN
RS-485 D
EVICE
..............................................11
CHAPTER 2: SYSTEM CONFIGURATION............................................13
N
ETWORK
T
OPOLOGIES
...............................................................................13
T
WO
W
IRE OR
F
OUR
W
IRE
S
YSTEMS
............................................................13
T
ERMINATION
.............................................................................................16
B
IASING AN
RS-485 N
ETWORK
....................................................................17
E
XTENDING THE
S
PECIFICATION
..................................................................19
CHAPTER 3: SELECTING RS-422 AND RS-485 CABLING..................20
N
UMBER OF
C
ONDUCTORS
..........................................................................20
S
HIELDING
.................................................................................................20
C
ABLE
C
HARACTERISTICS
...........................................................................20
CHAPTER 4: TRANSIENT PROTECTION OF RS-422 AND RS-485
SYSTEMS....................................................................................................23
W
HAT DOES A SURGE LOOK LIKE
................................................................23
Surge Specifications...............................................................................23
Common Mode vs. Differential Mode.....................................................25
G
ROUND
≠
G
ROUND
....................................................................................26
T
RANSIENT PROTECTION USING
I
SOLATION
..................................................27
Isolation Theory.....................................................................................27
Isolation Devices ...................................................................................28
T
RANSIENT
P
ROTECTION USING
S
HUNTING
..................................................28
Shunting Theory.....................................................................................28
Connecting Signal Grounds ...................................................................29
Shunting Devices ...................................................................................29
C
OMBINING
I
SOLATION AND
S
HUNTING
.......................................................29
S
PECIAL
C
ONSIDERATION FOR
F
AULT
C
ONDITIONS
.......................................31
C
HOOSING THE RIGHT PROTECTION FOR YOUR SYSTEM
.................................31
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相關代理商/技術參數 |
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| RS485-232 | 制造商:PR 功能描述: |
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