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Frequently Asked Questions
Question 5: What is DTE / DCE? How do I know my RS-232 Device is a DTE or a DCE?
Answer: DTE stands for Data Terminal Equipment, a PC is a DTE. DCE stands for Data Communication Equipment, a Modem is a DCE. DTE normally comes with a Male Connector, while DCE comes with a Female Connector, but that is not always the case. Use the guide below as a simple way to confirm: Measure Pin 3 and Pin 5 (DB9 Connector) with a volt meter. If you get a voltage of -3V to -15V, it is a DTE device. If the voltage is on Pin 2, then it is a DCE device. Note: The result for the DB-25 Connector is reversed, and Ground for the DB-25 is on Pin 7.
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