Computer serial cable pinout

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This image is for personal desktop wallpaper use only, if you are the author and find this image is shared without your permission, DMCA report please Contact Us. Home Computer Serial Port Pinout. Recent Post. Tim Hortons Smoothie. Buffer Tube Wrench. Path Of Exile 2 Witch.

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Also on a number of Telebit modem models the secondary channel is present. It can be used to query the modem status while the modem is on-line and busy communicating. On personal computers, the smaller DB9 version is more commonly used today. The diagrams show the signals common to both connector types in black. The defined pins only present on the larger connector are shown in red. 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 pinout is also shown for the DEC modified modular jack. 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. Although this serial interface is differential the receive and transmit have their own floating ground level which is not the case with regular RS it is possible to connect RS compatible devices with this interface because the voltage levels of the bit streams are in the same range. Where the definition of RS focused on the connection of DTE, data terminal equipment computers, printers, etc.

The original pinout for RS was developed for a 25 pins sub D connector. In mixed applications, a 9 to 25 pins converter can be used to connect connectors of different sizes. As most of the computers are equipped with the DB9 serial port version, all wiring examples on this website will use that connector as a default. If you want to use the example with a DB25, simply replace the pin numbers of the connector according to the conversion table below. The following RS connectors can be used to test a serial port on your computer.

The data and handshake lines have been linked. In this way all data will be sent back immediately. The PC controls its own handshaking. The first test plug can be used to check the function of the RS serial port with standard terminal software.

The second version can be used to test the full functionality of the RS serial port with Norton Diagnostics or CheckIt. Testing occurs in a few steps. Data is sent on the Tx line and the received information on the Rx input is then compared with the original data.

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. The second RS test plug has the advantage that the ring-indicator RI input line can also be tested.