a 9-pin serial port used to be used a a very large network connection via a null cable be for and after coxail netowrking and ethernet cabling... It was also used for Mouse and some minor peripherials device of input and som output devces... long long ago in a desktop far awa :) lol I feel old awnsering this one..
The legacy serial port is a 9-pin DB connector. The 15-pin one is mever mentioned in chapter 18 of the A+ managing and troubleshooting pc's textbook. 3rd edition.
A rollover cable with a RJ-45 connector will plug into a console port on a Cisco device, the other end can be a DB-9 connector or another RJ-45 that can plug into an adapter.
9
A DB-9 connector is a 9-pin connector, approximately 2cm long by 0.75cm wide, with two rows of pins or sockets, a row of 5 and, a row of 4, hence 9 pins total. It is often used in low-speed data communications such as RS-232, and is the connector on personal computers since the IBM PC-AT used for COM ports. There are larger versions with 15 pins, called DB-15 and used for game ports and 10Base5 network AUIs, and 25 pins, called DB-25 and used for earlier COM ports and printer ports among other things.
If it has 15 pins it is NOT a serial port! A serial port will have either 9 pins (DB-9), or 25 pins (DB-25). The 15 pin connector (usually blue) is analog video or VGA, and yes if your graphics card is powerful enough it can run dual monitors. You can either buy a dual port graphics card or a splitter to run dual monitors
The number of connectors will depend on which version of this serial bus interface you are considering. It will have either 4, 6 or 9 circuits (pins) depending on which "flavor" of the FireWire standard you are applying. Use the link below to review the standards and look at some pictures.
Serial ports typically use a DE-9 (sometimes mistakenly called "DB-9") connector. This is a connector with 9 male pins protruding from the computer. They are part of a group of connectors called "D-sub" connectors, both because of their shape, resembling a "D", and their size which was rather small at the time they were introduced.
Assuming you mean the "D" shell connector used for computer "VGA" connections to a monitor.It's aD shell (physical appearance),E size,15 connectors,So it's correctly called a DE15, but is often misnamed "DB15" - which it's not. To lessen confusion, many people just refer to it as the "VGA" connector.The common "DB" naming only applies (correctly) to the larger shell size commonly used for the 25-pin DB-25 connector. The small 9-pin D connector is correctly called DE-9.
1394b
1394B
It is a D shaped connector and has got 9 pins in it.
Look in the link I will place below