If the voltage is on Pin 2, then it is a DCE device. Use the simple way below to confirm: Measure Pin 3 and Pin 5 of a DB-9 Connector with a Volt Meter, if you get a voltage of -3V to -15V, then it is a DTE device. A modem is a DCE.ĭTE normally comes with a Male Connector, while DCE comes with a Female Connector. DCE stands for Data Communication Equipment. DTE and DCEĭTE stands for Data Terminal Equipment. RS-232C, EIA RS-232, or simply RS-232, refers to the same standard defined by the Electronic Industries Association in 1969 for serial communication. Step 1: Understand RS232 Connection & Signals If you have a chance to test your RS232 devices with the 232Analyzer software, you should be able to control your RS232 devices in a short period of time. This article will explain the following topics in details:ġ) Step 1: Understand RS232 Connection and Signalsģ) Step 3: Control your RS232 devices by using 232AnalyzerĪfter reading this page, you should be able to understand most of the hardware and software (protocol) standards for RS232.
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