How to connect two or more computers to one monitor

Posted on August 17, 2007 at 2:07 pm

Here at my office, we have five servers that are controlled by a single mouse and keyboard and are connected to only one monitor for ease of administration and lack of extra space! If you have more than one desktop at home, maybe a Windows box and a test box with Linux installed, you can connect both computers to one monitor using what is called a KVM switch.

A KVM switch, which shockingly stands for Keyboard, Video, Mouse, is a small piece of hardware that looks kind of like your wireless router, but instead of network ports, it has a VGA video port and PS2 or USB mouse/keyboard ports. The device is very simple to use and usually requires no external power source! Most KVM switches will draw their power from the computers that are connected through the provided cables.

Here’s an example of a D-Link 4-port KVM switch. One each side there are two sets of mouse, keyboard, and video connections. At the top left, you’ll notice a small button, which is used to “switch” between the computers. A lot of the newer KVM switches also allow control to be switched by pressing a particular key or performing a set of keystrokes on the keyboard.

There are two types of switches that you can buy, USB or PS2. Now that many computers have USB ports, the KVM cable will have one end that is USB, which you can simply plug into any free port and it will control both the mouse and keyboard. However, I suggest buying a PS2 KVM switch (like the D-Link shown above) because I have learned form experience that if something goes wrong with your computer and you have to boot into safe mode or do something in the BIOS, the keyboard and mouse will not work if connected to a USB KVM switch!

You can purchase KVM Switches that support anywhere from two computers all the way up to 64. Of course, these types of switches were mostly meant for large server rooms at companies, but now that many consumers have more than one desktop at home, D-Link, Netgear, and other hardware manufacturers have started creating consumer versions with two or four ports.

Most KVM switches that you will find online will have cables that are only about 6 ft. long, which means that the computers have to be in close proximity of the switch. If you want to connect multiple computers that are more than 10 ft away from the central monitor, you can use either a local remote KVM device or KVM Over IP.

With a local remote KVM device, you can connect computers to the device using normal network Category 5 cables. This setup require small interface devices at the computers that convert the peripheral device signals to network protocols that can be transmitted over Cat 5 cables and then get converted back to analog signals at the KVM device.

However, this option still requires that cables (Cat 5 in this case) are used to connect the computer directly to the switch. If you want to be able to control any computer on a network, you can do so using a KVM IP switch. This means that the computers can be connected to Local Area Network, Wide Area Network, or through a phone-line. The signals are converted and sent over the network to the KVM device where they are converted to normal signals.

You can find these more advanced switches at more specialized online stores, such as KVMs.com. Enjoy!

[tags]connect more than one computer to monitor, kvm switch, usb kvm switch, 2 port kvm switch, 4 port kvm switch, ip kvm switch, ps2[/tags]

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Comments

11 Responses to “How to connect two or more computers to one monitor”

telahun berahun said on : October 24th, 2007 at 6:54 am

I am computer engineering student so I likes your notes so pleace attache some sofetware or other thing

paul said on : May 7th, 2008 at 11:25 pm

are there PC’s that can be connected with more than one keyboard and mice

Peter said on : July 23rd, 2008 at 1:12 am

Is there anyway you can connect 2 monitors to 1 Computer? Not necessarily same time.

What I am looking for is a solution with which I can split VGA out from computer. When I am working on the computer I want to use the regular LCD monitor so I wont connect my HDTV. When I want to watch anything streaming, I will be connecting the LCD TV.

As I am planning to use this for a desktop, I dont want to switch the cables back and forth on Computer end.

Thnx in Advance

GEROGE said on : February 14th, 2009 at 2:30 pm

GREAT INFORMATION, KEEP UP THE GOOD WORK……..

THANK YOU…….
GEORGE.

Melvin Stephens said on : February 22nd, 2009 at 3:39 pm

Having problem using airlink 101 2-port kvm switch. Old 486 computer responds with airlink. New hp a1050y will not respond to mouse. Discovered this morning, if I turn on old computer first, then switch to new computer; new computer mouse works.

If I turn on hp first, it will not respond to mouse. But, can switch to old computer and it works. Can anyone help with suggestions in making hp work if it is first turned on?

crespo said on : June 27th, 2009 at 4:40 am

How can one come up with a computer system with multiple monitors displaying different data at the same time??

Abel said on : August 13th, 2009 at 2:34 pm

I am trying to use two computers with one monitor and mouse. One of the computers has USB connections for the mouse and the monitor, the other has PS2 connections. I purchase a MiniView Micro PS/2 Switch and the adapters for the computer with the PS2 connections, I cannot get my keyboard to work, I tried installing a PS2 keyboard in the computer with the USB connection using an adapter, with no luck.

I appreciate any suggestions you may have.

Abel

John Whytes said on : October 20th, 2009 at 4:48 pm

Hi! is-it possible to connect two computers to one monitor using a router? I have the D-Link Ethernet Broadband Router wired model : DI-704UP. If yes, can you please tell me how.

Thanks.

John Whytes

george said on : November 1st, 2009 at 10:55 am

Hi can i view 4 computers on one MONITOR at the same time?

Calle@jobbdator.se said on : November 9th, 2009 at 4:33 am

If you don’t want to buy hardware you can use Remote desktop instead – I use that to get access to my Mac and Linux computers from my W7. I use TightVNC http://www.tightvnc.com/

Multiplicity - Control multiple computers from one keyboard and mouse Says:

[...] graphic designers who already have multiple computers and multiple monitors. Note that you can also control multiple computers via one monitor using what is called a KVM Switch. The benefit of Multiplicity is that you can SEE all of the desktops simultaneously and easily [...]
January 5th, 2008 at 2:01 pm