rs232中rts和cts的作用（RTS and CTS RS232 in action）.docVIP

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rs232中rts和cts的作用（RTS and CTS RS232 in action）.doc

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rs232中rts和cts的作用（RTS and CTS RS232 in action）

rs232中rts和cts的作用（RTS and CTS RS232 in action） Ask: Quite understand, today suddenly feel that previous understanding is wrong, the following three kinds of interpretation of what? Explain: RTS terminal: Im ready, the data sent. CTS: here, take that Explain two: RTS: I am going to send you to the terminal data, with CTS fast response, ready? CTS: Well, come on Explain three: CTS: the host, I have received data request RTS: I was the host, ready request to send. I got a SIM100 module today, after I set the RTS invalid, who will be sent to the host data are not sent (including active data RING), instructions and instructions to return the results have not returned, all buffer module, I set the RTS effectively, all cached data sent. Including a lot of instruction execution results, thus, I feel on top of the interpretation should be right two should be wrong, but the interpretation of three is correct? That is CTS and RTS which is the sponsor? Answer: One is wrong The two is the RS232 standard Three is the MODEM hardware flow control SIMCOM explained the company completely correct A long time ago, the computer has not yet appeared, then it has existed in prehistoric times (computer) serial devices (teleprinter, industrial measurement equipment, communication modem), in order to connect the serial port, EIA RS232 standard, using DB25 connector, support synchronous and asynchronous serial port, D interface can effectively prevent the insert. Standard brings convenience. Time flies, personal computers, the existing serial device undoubtedly became the first peripheral, naturally the RS232 standard is adopted in personal computer. But equipment manufacturers tend to be smaller, lower cost of the interface, therefore, will not use DB25 in synchronous mode and support pins removed, forming DB9. The initial situation is quite chaotic, because DB9 only defines the relationship between signal, but did not specify signals and pins, each manufacturer can only define. Fortunately,