8/9/2023 0 Comments Serial 9 pin cable![]() The signal level on the DTR and RTS lines is also controlled by the test software and the attached inputs are read back in the software to see if these signal levels are properly returned. ![]() Data is sent on the Tx line and the received information on the Rx input is then compared with the original data. RS232 loopback test plug for Norton Diagnostics and CheckIt ![]() RS232 DB25 loopback connector (Norton/Checkit) DB9 Where the definition of RS232 focused on the connection of DTE, data terminal equipment (computers, printers, etc.) with DCE, data communication equipment (modems), MMJ was primarily defined for the connection of two DTE’s directly. Although this serial interface is differential (the receive and transmit have their own floating ground level which is not the case with regular RS232) it is possible to connect RS232 compatible devices with this interface because the voltage levels of the bit streams are in the same range. This type of connector has been used on systems built by Digital Equipment Corporation in the early days one of the leaders in the mainframe world. The pinout is also shown for the DEC modified modular jack. Note, that the protective ground is assigned to a pin at the large connector where the connector outside is used for that purpose with the DB9 connector version. The defined pins only present on the larger connector are shown in red. The diagrams show the signals common to both connector types in black. On personal computers, the smaller DB9 version is more commonly used today. It can be used to query the modem status while the modem is on-line and busy communicating. 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 Since it does not have onboard video, you will need to install a video-card.Almost nothing in computer interfacing is more confusing than selecting the right RS232 serial cable. In summary, no, a serial port is not a video port and there is no way to use a monitor of any kind with it (even a 9-pin monitor, let alone 15-pin one). The one you see has both icons because it can be used for different motherboards and on some, instead of a serial port, there is a 15-pin VGA connector there (which has the same physical dimensions of a 9-pin serial port). Cases used to come with several bezels of common variations, but because these days, motherboard backplanes come in a wide variety, they don’t and instead, motherboards come with a bezel specific to the board that can be snapped into a case. What you see is a generic bezel not specific to that motherboard. The P4C800 does not have a 9-pin monitor connector (or even onboard VGA). Seeing your photo and the model of the motherboard, it is most definitely a serial port. You could also put your own ad specifically asking for one. Your best bet is to check the local classifieds (especially online ones such as Kijiji or eBay Classified) to see if anyone nearby has a 9-pin monitor collecting dust in the closet. You could try looking for a converter, but I for one have not seen or heard of any such thing, and would imagine it would be expensive anyway. VGA monitors use a special D-sub 15-pin connector (DE-15F) and cannot be connected even with an adapter because the pinouts are completely different (because VGA is analog and works very differently from the older, digital CGA and EGA standards). or a rectangle, then it is a DE-9 connector for CGA or EGA monitors. If it on the other hand, it is marked with Mon. If it is specifically marked as RS-232 (or with a string of one’s and zero’s), then it is a serial port for things like serial mice.
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