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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： | 23/44頁 |
| 文件大小： | 628K |
| 代理商： | RS-485 |
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20
RS-422/485 Application Note
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 434-7094
Chapter 3: Selecting RS-422 and RS-485 Cabling
Cable selection for RS-422 and RS-485 systems is often neglected.
Attention to a few details in the selection process can prevent the costly
prospect of re-pulling thousands of feet of cable.
Number of Conductors
The signal ground conductor is often overlooked when ordering cable. An
extra twisted pair must be specified to have enough conductors to run a signal
ground. A two wire system then requires two twisted pair, and a four wire
system requires three twisted pair.
Shielding
It is often hard to quantify if shielded cable is required in an application or
not. Since the added cost of shielded cable is usually minimal it is worth
installing the first time.
Cable Characteristics
When choosing a transmission line for RS-422 or RS-485, it is necessary
to examine the required distance of the cable and the data rate of the system.
The Appendix to EIA RS-422-A Standard presents an empirical curve that
relates Cable Length to Data Rate for 24 AWG twisted-pair telephone cable
that has a shunt capacitance of 16 pF/ft. and is terminated in 100 ohms (see
Figure 3.1). This curve is based on signal quality requirements of:
a). Signal rise and fall time equal to, or less than, one-half unit interval at
the applicable modulation rate.
b). The maximum voltage loss between driver and load of 6 dB.
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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: |
| RS485-C1(AS) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:RS232/RS485 CONV (AS) |
| 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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