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參數(shù)資料
| 型號： | RS-422 |
| 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)： | 6/44頁 |
| 文件大?。?/td> | 628K |
| 代理商： | RS-422 |
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RS-422/485 Application Note
3
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 434-7094
Balanced Line Receivers
A balanced differential line receiver senses the voltage state of the
transmission line across two signal input lines, A and B. It will also have a
signal ground (C) that is necessary in making the proper interface
connection. Figure 1.3 is a schematic symbol for a balanced differential line
receiver. Figure 1.3 also shows the voltages that are important to the
balanced line receiver. If the differential input voltage Vab is greater than
+200 mV the receiver will have a specific logic state on its output terminal.
If the input voltage is reversed to less than -200 mV the receiver will create
the opposite logic state on its output terminal. The input voltages that a
balanced line receiver must sense are shown in Figure 1.3. The 200 mV to 6
V range is required to allow for attenuation on the transmission line.
EIA Standard RS-422 Data Transmission
The EIA Standard RS-422-A entitled “Electrical Characteristics of
Balanced Voltage Digital Interface Circuits” defines the characteristics of
RS-422 interface circuits. Figure 1.4 is a typical RS-422 four-wire interface.
Notice that five conductors are used. Each generator or driver can drive up
to ten (10) receivers. The two signaling states of the line are defined as
follows:
a. When the “A” terminal of the driver is negative with respect to the “B”
terminal, the line is in a binary 1 (MARK or OFF) state.
b. When the “A” terminal of the driver is positive with respect to the “B”
terminal, the line is in a binary 0 (SPACE or ON) state.
Figure 1.5 shows the condition of the voltage of the balanced line for an
RS-232 to RS-422 converter when the line is in the “idle” condition or OFF
state. It also shows the relationship of the “A” and “B” terminals of an RS-
422 system and the “-“ and “+” terminal markings used on many types of
equipment. The “A” terminal is equivalent to the “-“ designation, and the
“B” terminal equivalent to the “+” designation. The same relationship
shown in Figure 1.5 also applies for RS-485 systems. RS-422 can withstand
a common mode voltage (Vcm) of ±7 volts. Common mode voltage is
defined as the mean voltage of the A and B terminals with respect to signal
ground.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| RS-485 | RS-422 AND RS-485 APPLICATION NOTE |
| RS-MK-X2010 | High Integrity FM Transceiver |
| RS3FS | SDR Cable Assembly; Connector Type A:micro D Ribbon Plug; Connector Type B:micro D Ribbon Plug; Cable Length:2m; No. of Contacts:26; Pitch Spacing:0.8mm RoHS Compliant: Yes |
| RS3FS | Damper Diodes (For TV) |
| RS4FS | SDR Cable Assembly; Connector Type A:micro D Ribbon Plug; Connector Type B:micro D Ribbon Plug; Cable Length:5m; No. of Contacts:26; Pitch Spacing:0.8mm RoHS Compliant: Yes |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| RS422-GE1 | 制造商:Carlo Gavazzi 功能描述:CABLE FOR GE90 |
| RS422-MI1 | 制造商:Carlo Gavazzi 功能描述:CABLE FOR MITS MASTER |
| RS422-MI2 | 制造商:Carlo Gavazzi 功能描述:CABLE FOR MITS MASTER |
| RS422-MI3 | 制造商:Carlo Gavazzi 功能描述:CABLE FOR MITS MASTER |
| RS422-OM2 | 制造商:Carlo Gavazzi 功能描述:CABLE FOR OMRON MASTER |
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