In the 60's a standards committee now known as the Electronic Industries Association developed an interface to connect computer terminals to modems. The Ins and Outs of RS232 | Testing Serial Port Communication | Status of the COM Port Lines | DTR High: Removing Handshaking | Further Reading | Comments or Questions? Finally there are suggestions for further reading and you are invited to send us your comments or questions. The next section gives a step-by-step guide to getting communications working: testing the different elements of the system. It starts by discussing the RS232 standard and continues with the various pin connections available. This article tells you just about everything you need to know to get a RS232 connection working between your computer and your measuring device or instrument.
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