By: Arthur Cooper
Submitted: 2011-07-07 11:08:05 | Word Count: 664
The VGA to BNC converter is just one of the examples of a digital video security system taking advantage of the component type assembly that leads to its extremely high versatility. Most security video monitors use the BNC connector, although there are a few that can also accept VGA input. The VGA to BNC converter allows the user to connect a VGA output to a BNC output; such might be the case with a DVR that only has one output type available (VGA).
For example, Security Camera King’s 4 and 8 channel Elite Mini Economy DVRs have VGA output only. If you are using an (older) personal computer model monitor, it will most likely have a VGA input connection (and no BNC connection) so the only thing that is needed to use your VGA monitor in this case is a VGA to VGA cable.
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However, considering the flipside of this example, most security monitors today use either BNC connectors, HDMI connectors, or RCA connectors but not VGA connectors. In addition, since the U. S. government’s decision to make all television broadcasting digital, many individuals have been motivated to purchase new TVs. These newer flat screen LCD TVs usually have a multitude of various connectors, but quite often VGA isn’t one of them.
So, if your DVR has only a VGA output for a monitor and your monitor does not have a VGR input but does have a BNC input then a VGA to BNC converter can really save the day for you and your system. The most common type of converter for this situation has an accompanying electronics that help in converting the 15 pin (and therefore 15 wire) VGA cable into a simpler two wire BNC connector.
While we are on the subject of VGA to BNC converters, let’s take a closer look at each type of connector/cable. VGA or Video Graphics Array connector has three rows of 5 pins each (each pin is connected to a wire within the cable). There are many other names for this type of connector with the more common ones being DE-15, D-sub 15, and RGB connector.
Without going into detail about the function of each wire in this type connector suffice it to say that the VGA connector basically presents the signal in an RGB (Red, Green, and Blue) configuration while including a horizontal sync and a vertical sync component. The VGA cable and connector provide a superior high definition display but at a cost; the cable length maximums are relatively short and going beyond these maximums can result in degradation of the video image in many different ways.
The BNC connector is named after two of its inventors, Paul Neill and Carl Concelman. The “B” in BNC stands for the bayonet mount locking mechanism the connector possesses for holding it in place. Unlike the 15 wire VGA connector, the BNC connector is normally used with coaxial cable utilizing a solid wire core with a metal sheath (i.e. analogous to a two wire connection). There are 50 and 75 ohm versions of BNC connectors and it is important to use the right impedance. Most digital video security systems use the 75 ohm BNC connector.
Although the BNC connector is seldom used in public cable applications, video game connections, and other possible applications, it is still the most common connector used within the digital video security system industry. In fact, one of the main differences between a digital video system monitor and a computer or flat screen TV is the fact that the system monitor usually comes from the factory with BNC inputs. Hence, hopefully it is easier now to see why the VGA to BNC converter exists.
However, it would not be doing justice to at least briefly mention the BNC to VGA converter, as this is by far more commonly used adapter in the security camera industry. The BNC to VGA adapter is very popular today as it allows users to make use of their older VGA type computer monitors for their security system.
Whether its a VGA to BNC converter or a BNC to VGA converter that you may need, double check your connections, including what direction the intended signal is running, before making your adapter purchase.
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