Because of this DTE connectors are labeled according to the signal on the pin, DCEs are labeled according to the signal that should be coming from the DTE. ![]() pin 1 wired to pin 1, pin 2 wired to pin 2, etc. If you're connecting a DB25M DTE to a DB25F DCE you can use a straight-through cable, i.e. Other connectors may be used but these are the most common.Ī typical DTE is a serial port on a terminal, a Com port on a PC or the serial port on an EDS2100.Ī typical DCE is the serial port on a modem or on a UDS-10, UDS100 or UDS1100. There are no hard and fast rules but in general a DTE will have a male DB25 or possibly a male DB9 connector and a DCE will have a female DB25 or DB9. However, as time went by folks wanted to connect two DTEs (or two DCEs) to each other, and DB9* connectors started being used, so alternative cable wirings were required. Everything would use DB25 connectors and everyone would always connect a DTE to a DCE using a straight-through cable and everything would be easy. When RS232 was developed the idea was that there would be 2 kinds of devices, DTE (Data Terminal Equipment) and DCE (Data Communications Equipment). ![]() How should cables between different types of RS232 ports be wired?Įxample cables for connection from a PC to various Lantronix products with DB connectors are provided near the end of this FAQ
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