Pc serial port pinout db98/9/2023 ![]() ![]() Also on a number of Telebit modem models the secondary channel is present. Examples of this are the Sun SparcStation 10 and 20 models and the Dec Alpha Multia. Only very few computers have been manufactured where both serial RS232 channels are implemented. In practice, only one serial communication channel with accompanying handshaking is present. In this DB25 connector pinout provisions were made for a secondary serial RS232 communication channel. ![]() The RS232 connector was originally developed to use 25 pins. These pages are intended to provide information about the most common serial RS232 cables in normal computer use, or in more common language “How do I connect devices and computers using RS232?” RS232 serial connector pin assignment Almost nothing in computer interfacing is more confusing than selecting the right RS232 serial cable. ![]()
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