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What is the difference between DTE and DCE devices?

The term DTE Data Terminal EQUIPMENT is used to describe the initiator or controller of the serial connection, typically the computer. A PLC is defined as a DTE device. The term DCE Data Communications EQUIPMENT describes the device that is connected to the DTE device such as a modem. The terms are most often used in reference to serial communications defined by the EIA RS232 standard.

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