Abstract
The PC's serial communication ports (COM1 and COM2) were once the means of linking a PC with the rest of the world. Modern machines use much faster connections such as USB but there are many legacy devices that use the serial port to connect to the PC. The serial port standard is known as recommended standard (RS)-232C. The standard relates essentially to two types of equipment: data terminal equipment (DTE) and data circuit terminating equipment (DCE). Data terminal equipment (is capable of sending and/or receiving data via the COM1 or COM2 serial interface. Data circuit terminating equipment facilitates data communications such as a typical modem (modulator–demodulator) forming an essential link in the serial path between a PC and a telephone line. A PC serial interface is usually implemented using a standard 25-way D connector. The PC (the DTE) is fitted with a male connector and the peripheral device (the DCE) normally uses a female connector. When one needs to link two PCs together, they must both adopt the role of DTE while thinking that the other is a DCE. This chapter explains the troubleshooting process for communication ports.
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