Frequently Asked Questions

Multi-Monitor KVM Switches

Help! My screen/audio is stuck on one computer even when I switch to the other!
This is a simple fix: use the command sequence [hotkey] [hotkey] [r] [0] this will reset all the screens and audio to their default configurations.
Will the dual monitor KVM support 2 monitors that are 144Hz or 165Hz refresh rate?

In theory it will be depending on  the chipset’s data rate supported inside the KVM switch models and the graphic card/chip sets of connected systems or the quality of video cables.   With KVM switch, OC (Over Clock) refresh rate will not be supported.

 Product line  Core Tech. Max. Data Rate (on chip)

Real Data Rate

Suggested resolution /refresh rate


DisplayPort DP 1.4  chip  25.92 Gbit/s, 23.32 ~ 22.03 Gbit/s  3840×2160/144/8/4:2:2   3840×2160/120/8/RGB   5120×1440/120/8/RGB   3440×1440/144/8/RGB   2560×1440/144/10/RGB   1920×1080/240/10/RGB UDP-12AP, UDP2-12AP, UDP-14AP, UDP2-14AP
DVI-DL, HDMI TMDS , DVI-dual link, HDMI 1.4  8.16 Gbit/s  7.34 ~ 6.94 Gbit/s 3840×2400/30  w/CVT-RB 3840×2160/30 HDMI   2560×1600/60  DVI-DL  1920×1200/120 DVI-DL UD-12AP, UDD-12A+, UDD-14A+
DVI-D TMDS, DVI-Single link,  HDMI 1.2 3.96 Gbit/s 3.7 ~ 3.56  Gbit/s 1920×1200/60 w/CVT-RB  UD-12+, UD-14+, UD-18+, UD-112+, UDV-12A+, UDV-14A+

Why is my blue tooth wireless device not working when I switch over to my Mac?

There have been a lot of user complaints about not being able to use the blue tooth wireless devices with their Mac computers/laptops after the user updated the MacOS. If you have recently updated your Mac device to the MacOS 10.15 (Catalina), MacOS 11 (Big Sur), or MacOS 12 (Monterey), then these MacOS versions will not allow the blue tooth wireless device to work correctly. For now, please connect the blue tooth wireless receiver dongle to the USB port of the KVM switch instead of the DDM port. We’ve found that’s the only way to get the blue tooth wireless devices to work with the KVM switch.

Here’s a link to an article discussing the issue with the new MacOS and possible ways to address this issue:

USB KVM Switches

How do I keep my video from flashing every time I change ports on my DVI KVM switch?
If you purchased a UD-12+ or UD-14+ after February of 2011, then you should have the ability to reconfigure the way DVI is triggered on a particular port. First, you must switch to the port which is giving you the problem. Once on that port, press and hold that port button on the front of the switch, for about 3 seconds, then release. You should hear a series of 2 or 3 beeps. If you hear 2 beeps, then you’ve changed it from the default and you should now try switching back and forth to see if that has made a difference.
What is the hot-key combination for switching ports?
On our USB KVM switches with DDM, the hot-key by default is set to Ctrl. This can be changed to other available options with the Hot-Key Select button on the front of the switch. The command sequence for all of them is [hotkey] [hotkey] [#]. All three are tapped consecutively (not simultaneously), with [hotkey] being for example, the Ctrl key and [#] being the number of the port you are switching to.
Can I cascade multiple KVM Switches?
The USB KVM switches cannot be cascaded.
How can I connect my USB KVM switch to a computer that has PS/2 keyboard and mouse ports?
As long as the computer has available USB ports, you can use those instead of the PS/2 ports.
What if I want to use a wireless keyboard/mouse combo with the KVM switch?
That should not be a problem. Make sure that the keyboard and mouse function on all computers when directly connected, then try connecting through the KVM switch.
What can I do if I’ve hooked everything up, and although the video works, I get no keyboard and mouse functionality on any of the connected computers?
Here are some steps to go through if your KVM switch has lost keyboard and mouse functionality.

  1. Disconnect the power and all cables and connections from the switch. There should be no lights illuminated on the KVM. Let it sit for about 1 minutes.
  2. Reconnect the Power adapter to the KVM, followed by the Keyboard, Mouse, and monitor.
  3. After those console connections are attached, connect one of your computers back to Port 1 of the KVM.
  4. Make sure the keyboard and mouse are working on that computer, then connect the second computer.
  5. At this point, the KVM has been completely reset, and it should be back in operable condition.

PS/2 KVM Switches

What is the hot-key combination for switching ports?
The standard method for switching ports via Hot-key controls is pressing the left Control key twice, followed by the number of the port you’re switching to. Example: Control + Control + 2, should switch the KVM to Port #2.
What is the hot-key combination for pulling up the On-Screen Display menu?
If your KVM features OSD, pressing the left Control key three times consecutively should initialize it.
What do I need to cascade multiple KVM switches?
For cascading multiple KVM switches, no special cabling is needed. You will need the standard PS/2 KVM cable to connect the console ports on the slave switch to one of the available KVM ports on the master switch. Note: The master switch should have an equal or greater number of ports than the slave switch.
How can I connect a computer that only has USB ports and no PS/2 ports.
If you’re trying to connect a computer without PS/2 ports to a PS/2 KVM switch, you’ll need to purchase the ConnectPRO PS/2 to USB adapter, part number: MT-606-1.

EDID Emulators

Does the display I want to use have to be cloned?
No. There is an alternate mode, represented by a green LED light, which feeds a profile for a standard display, with some common resolutions built-in.
Will the Emulator ever need to be recloned? Does it ever lose the cloned image? Does it have to be recloned after being without power for a certain amount of time?
The Emulator will keep the cloned image permanently until a new monitor is cloned, which effectively overwrites the initial cloned image.