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Standard RS-232 wiring | |||||||||||||||||||||||||||||||
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What is DTE and DCE ? Data Terminal Equipment (DTE) is typically either a dumb terminal or the serial port on a computer/workstation. Data Communications Equipment (DCE) is typically a modem, DSU/CSU, or other piece of data communications equipment. How connections are established between a DTE and DCE ? The pin specifications of RS232 are written from the perspective of DTE end of link. so, the output from DTE becomes a input to DCE. Thus, Transmitted Data (TD) is a output signal for DTE, but it becomes a input signal for a DCE. To connect a DTE and DCE, we just need a straight (pin-to-pin) cable. If we want to connect two DTE with each other then, a cross-over cable is required. this just makes each DTE feel that it is connected to a DCE at other end. |
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