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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)： | 14/44頁 |
| 文件大小： | 628K |
| 代理商： | RS-485 |
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RS-422/485 Application Note
11
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 434-7094
Send Data Control of an RS-485 Device
Many of B&B Electronics’ RS-232 to RS-485 converters and RS-485
serial cards include special circuitry, which is triggered from the data signal
to enable the RS-485 driver. Figure 1.9 is a timing diagram of the important
signals used to control a converter of this type. It is important to note that
the transmit data line is “disabled” at a fixed interval after the last bit,
typically one character length. If this interval is too short, you can miss parts
of each character being sent. If this time is too long, your system may try to
turn the data line around from transmit to receive before the node (with the
Send Data converter) is ready to receive data. If the latter is the case, you
will miss portions (or complete characters) at the beginning of a response.
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| 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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