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Pro Rs 232

pawel.koprowski
2015-02-16 06:07:48
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WinSockWinSock CPlusPlus, C-C++C++

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Pro Rs CommunicationRS-232 is the most common serial interface and ships as a standard component on most Windows-compatible desktop computers. RS-232 only allows for one transmitter and one receiver on each line. RS-232 also uses a Full-Duplex transmission method. Some RS-232 boards sold by National Instruments support baud rates up to 1 Mbit/s, but most devices are limited to 115.2 kbits/s. Note that RS-422/RS-485 interface is not available on most IBM PCs.

RS-422 (EIA RS-422-A Standard) is the serial connection used on Apple computers. It provides a mechanism for transmitting data up to 10 Mbits/s. RS-422 sends each signal using two wires to increase the maximum baud rate and cable length. RS-422 is also specified for multi-drop applications where only one transmitter is connected to, and transmits on, a bus of up to 10 receivers.

RS-485 is a superset of RS-422 and expands on the capabilities. RS-485 was made to address the multi-drop limitation of RS-422, allowing up to 32 devices to communicate through the same data line. Any of the slave devices on an RS-485 bus can communicate with any other 32 slave devices without going through a master device. Since RS-422 is a subset of RS-485, all RS-422 devices may be controlled by RS-485.

Both protocols have multidrop capability, but RS-485 allows up to 32 devices and RS-422 has a limit of 10. For both communication protocols, you should provide your own termination. All National Instruments RS-485 boards will work with RS-422 standards.  

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Pro Rs 232 (787.20 kB)

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