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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)： | 9/44頁 |
| 文件大?。?/td> | 628K |
| 代理商： | RS-485 |
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6
RS-422/485 Application Note
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 434-7094
EIA Standard RS-485 Data Transmission
The RS-485 Standard permits a balanced transmission line to be shared
in a party line or multidrop mode. As many as 32 driver/receiver pairs can
share a multidrop network. Many characteristics of the drivers and receivers
are the same as RS-422. The range of the common mode voltage Vcm that
the driver and receiver can tolerate is expanded to +12 to -7 volts. Since the
driver can be disconnected or tristated from the line, it must withstand this
common mode voltage range while in the tristate condition. Some RS-422
drivers, even with tristate capability, will not withstand the full Vcm voltage
range of +12 to -7 volts.
Figure 1.6 shows a typical two-wire multidrop network. Note that the
transmission line is terminated on both ends of the line but not at drop points
in the middle of the line. Termination should only be used with high data
rates and long wiring runs
.
A detailed discussion of termination can be
found in Chapter 2 of this application note. The signal ground line is also
recommended in an RS-485 system to keep the common mode voltage that
the receiver must accept within the -7 to +12 volt range. Further discussion
of grounding can be found in Chapter 3 of this application note.
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相關(guān)代理商/技術(shù)參數(shù) |
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| RS485-232 | 制造商:PR 功能描述: |
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| RS485-C1(EU) | 制造商:Equinox Technologies 功能描述:RS232/RS485 CONV (EU) |
| RS485-C1(UK) | 制造商:Equinox Technologies 功能描述:RS232/RS485 CONV (UK) |
| RS485-C1(US) | 制造商:Equinox Technologies 功能描述:RS232/RS485 CONV (US) |
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