Ihse L484-8VHSWR, L484-8VESWR, L484-8VHCWR, L484-8VECWR, 474-6RMK User Manual

IHSE GmbH  Maybachstraße 11  88094 Oberteuringen  Germany

[e-mail]  www.ihse.com  phone: [phone]  fax: [phone]

Draco

484 Series

CPU Switch

User Manual

Edition: 2017-03-31

Draco CPU Switch

2 2017-03-31

Copyright

© 2017. All rights reserved. This information may not be reproduced in any
manner without the prior written consent of the manufacturer.

Information in this document is subject to change without notice.

Trademarks

All trademark and trade names mentioned in this document are
acknowledged to be the property of their respective owners.

Disclaimer

While every precaution has been taken during preparation of this manual,
the manufacturer assumes no liability for errors or omissions. The
manufacturer assumes no liability for damages resulting from the use of
the information contained herein.

The manufacturer reserves the right to change specifications, functions, or
circuitry of the product without notice.

The manufacturer cannot accept liability for damage due to misuse of the

product or due to any other circumstances outside the manufacturer’s

control (whether environmental or installation related). The manufacturer
shall not be liable for any loss, damage, or injury arising directly, indirectly,
incidentally, or consequently from the use of this product.

Contents

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Contents

1 About This Manual ....................................................................... 6

1.1 Scope .................................................................................. 6

1.2 Validity ................................................................................ 6

1.3 Cautions and Notes ............................................................ 6

2 Safety Instructions ....................................................................... 7

3 Description ................................................................................... 8

3.1 Application .......................................................................... 8

3.2 System Overview ................................................................ 9

3.3 Product Range .................................................................. 10

3.4 Upgrade Kits ..................................................................... 10

3.5 Accessories ....................................................................... 10

3.6 Device Views .................................................................... 11

3.6.1 Model L484-8VHCWR, -8VECWR ...................... 11

3.6.2 Model L484-8VHSWR, -8VESWR ...................... 12

3.7 Status LEDs ...................................................................... 13

4 Installation .................................................................................. 15

4.1 Package Contents ............................................................. 15

4.2 System Setup .................................................................... 15

4.3 Example Applications ........................................................ 16

5 Configuration .............................................................................. 17

5.1 Command Mode ............................................................... 17

5.2 Control via Keyboard......................................................... 18

5.3 On Screen Display (OSD) ................................................. 20

5.3.1 Main Menu Item 'Color Settings' ......................... 21

5.3.2 Main Menu Item 'Picture Settings' ....................... 23

5.3.3 Main Menu Item 'Input Settings' .......................... 26

5.3.4 Main Menu Item 'Output Settings' ....................... 27

5.3.5 Main Menu Item 'General Settings' ..................... 29

6 Operation .................................................................................... 33

6.1 Optimization of Picture Settings ........................................ 33

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6.1.1 Optimization of Output Settings .......................... 33

6.1.2 Optimization of Input Settings ............................. 34

6.1.3 Optimization of Picture Settings .......................... 35

6.2 Download of DDC Information .......................................... 35

6.2.1 Download of DDC via Keyboard ......................... 36

6.2.2 Download of DDC via OSD ................................. 36

6.2.3 Further DDC settings .......................................... 37

6.3 Shared Operation .............................................................. 37

7 Specifications ............................................................................. 39

7.1 Interfaces .......................................................................... 39

7.1.1 VGA .................................................................... 39

7.1.2 USB-HID ............................................................. 39

7.1.3 USB 2.0 (transparent) ......................................... 39

7.1.4 Analog Audio Interface ........................................ 40

7.1.5 RJ45 (Interconnect) ............................................ 40

7.1.6 Fiber SFP Type LC (Interconnect) ...................... 41

7.2 Interconnect Cable ............................................................ 41

7.2.1 Cat X ................................................................... 41

7.2.2 Fiber .................................................................... 42

7.3 Connector Pinouts ............................................................ 43

7.4 Power Supply .................................................................... 45

7.5 Environmental Conditions ................................................. 45

7.6 Size ................................................................................... 45

7.7 Shipping weight ................................................................. 45

8 Troubleshooting ......................................................................... 46

8.1 Blank Screen ..................................................................... 46

8.2 Picture ............................................................................... 47

8.3 USB-HID ........................................................................... 48

8.4 Analog Audio ..................................................................... 49

9 Technical Support ...................................................................... 50

9.1 Support Checklist .............................................................. 50

9.2 Shipping Checklist ............................................................ 50

Contents

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10 Certificates .................................................................................. 51

10.1 CE Declaration Of Conformity ........................................... 51

10.2 North American Regulatory Compliance ........................... 52

10.3 WEEE ............................................................................... 52

10.4 RoHS/RoHS 2 ................................................................... 53

11 Glossary ...................................................................................... 54

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1 About This Manual

1.1 Scope

This manual describes how to install your CPU Switch, how to operate it
and how to perform trouble shooting.

1.2 Validity

This manual is valid for all devices listed on the front page. The product
code is printed on the base of the devices.

1.3 Cautions and Notes

The following symbols are used in this manual:

This symbol indicates an important operating instruction that should be
followed to avoid any potential damage to hardware or property, loss of
data, or personal injury.

This symbol indicates important information to help you make the best use
of this product.

This symbol indicates best practice information to show recommended
and optimal ways to use this product in an efficient way.

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Safety Instructions

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2 Safety Instructions

To ensure reliable and safe long-term operation of your CPU Switch
please note the following guidelines:

Installation

 Only use in dry, indoor environments.
 Only use the device according to this User Manual. Failure to follow

these procedures could result in damage to the equipment or injury to
the user or installer.

 The CPU Switch and the power supply units can get warm. Do not

install components in an enclosed space without any airflow.

 Do not place the power supply directly on top of the device.
 Do not obscure ventilation holes.
 Only use power supplies originally supplied with the product or

manufacturer-approved replacements. Do not use a power supply if it
appears to be defective or has a damaged chassis.

 Connect all power supplies to grounded outlets. In each case, ensure

that the ground connection is maintained from the outlet socket
through to the power supply's AC power input.

 Do not connect the link interface to any other equipment, particularly

network or telecommunications equipment.

 Take any required ESD precautions.

In order to disconnect the device completely from the electric circuit, all
power cables have to be removed.

Repair

 Do not attempt to open or repair a power supply unit.
 Do not attempt to open or repair the CPU Switch. There are no user

serviceable parts inside.

 Please contact your dealer or manufacturer if there is a fault.

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3 Description

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3.1 Application

The CPU Switch is used to convert and extend video signals of one or
more VGA sources (computer, CPU) into the DVI-D format. The device
functions like a CPU Unit of a KVM extender.

The CPU Switch can be used as a switch between concurrently available
input signals.

Next to the video signal, USB-HID and analogue audio signals can be also
switched and extended.

The CPU Switch can further be used as a scaler, scaling video signals to
a specific output format.

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Description

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3.2 System Overview

The input ports of the CPU Switch are connected to the video source(s)
(computer, CPU), using the provided cables or other suitable cables.

The DVI-D monitor is connected to the output of the CON Unit.

System Overview

1 VGA Sources (computer, CPU)
2 CPU Switch (as CPU Unit)
3 KVM extender CON Unit
4 Console (monitor, keyboard, mouse)

See Chapter 4.3, Page 16 for installation examples.

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3.3 Product Range

Model

Description

L484­8VHCWR

8 port CPU Switch as a KVM extender CPU Unit with
integrated analog/digital conversion (up to 1920x1200)
and redundant connector for interconnect cables (Cat X),
USB-HID, local USB 2.0 (High-Speed), Analog Audio

L484­8VHSWR

8 port CPU Switch as a KVM extender CPU Unit with
integrated analog/digital conversion (up to 1920x1200)
and redundant connector for interconnect cables (fiber),
USB-HID, local USB 2.0 (High-Speed), Analog Audio

L484­8VECWR

8 port CPU Switch as a KVM extender CPU Unit with
integrated analog/digital conversion (up to 1920x1200)
and redundant connector for interconnect cables (Cat X),
USB-HID, USB 2.0 embedded, local USB 2.0 (High­Speed), Analog Audio

L484­8VESWR

8 port CPU Switch as a KVM extender CPU Unit with
integrated analog/digital conversion (up to 1920x1200)
and redundant connector for interconnect cables (fiber),
USB-HID, USB 2.0 embedded, local USB 2.0 (High­Speed), Analog Audio

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3.4 Upgrade Kits

Model

Description

474-6RMK

19"/1U rack mount kit for CPU Switch

The CPU Switch and the provided power supply units can get warm, for
this reason an installation in closed rooms without air circulation is not
allowed. Please note that you will need at least 0,5 U (height unit) for the
ventilation above the extenders, if you mount them into racks.

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3.5 Accessories

Model

Description

261-6J

VGA cable 2.0 m (VGA male to VGA male)

247-U1

USB cable 1.8 m (Type A to B)

455-CK

Stereo jack cable 1.6 m (3.5 mm Stereo)

474-IECLOCK

IEC connection cable for power supply, lockable

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Description

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3.6 Device Views

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3.6.1 Model L484-8VHCWR, -8VECWR

Rear View

1 To CPU 1: VGA (accordingly CPU #2-8)
2 Connect to interconnect cable 1
3 Connect to interconnect cable 2 (redundancy)
4 Connect to power supply 1
5 Connect to power supply 2 (redundancy)
6 To CPU 1: Audio IN (accordingly CPU #2-8)
7 To CPU 1: Audio OUT (accordingly CPU #2-8)
8 To CPU 1: USB (accordingly CPU #2-8)
9 Connect to USB 2.0 devices
10 Service port

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3.6.2 Model L484-8VHSWR, -8VESWR

Rear View

1 To CPU 1: VGA (accordingly CPU #2-8)
2 Connect to interconnect cable 1
3 Connect to interconnect cable 2 (redundancy)
4 Connect to power supply 1
5 Connect to power supply 2 (redundancy)
6 To CPU 1: Audio IN (accordingly CPU #2-8)
7 To CPU 1: Audio OUT (accordingly CPU #2-8)
8 To CPU 1: USB (accordingly CPU #2-8)
9 Connect to USB 2.0 devices
10 Service port

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Description

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3.7 Status LEDs

The CPU Switch is fitted with a multi-color LED for indication of the
connection status:

Model L484-8VHCWR, -8VECWR

Rear View

Model L484-8VHSWR, -8VESWR

Rear View

LED 1: Switching Status

Pos.

LED

Status

Description

1

Input LED

(green)

Off

Connection not available

On

Video signal available

Flashing
rapidly

Channel selected, no video signal
available

Flashing
slowly

Channel selected, video signal available

LED 2 and 3: Connection Status

Pos.

LED

Status

Description

2

Failure LED

(green)
Off

Connection available

On or
Flashing

Connection failure (flashing for about
20 s following a connection failure)

3

Status LED

(green)

Flashing

No connection via interconnect cable

On

Connection available

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LED 5 and 7: USB and Video Status (Link 1/2)

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LED color

Description

Red

Device ready

Violet

Connection and USB signal (connection to extender)
available

Green

Connection and video signal available

Light
Blue

Connection, USB and video signal available
(operating condition)

LED 4 and 6: Power Supply Unit Status

Pos.

LED

Status

Description

4

Status
PSU 2

(green)

On

Operating condition

Off

Power supply unit off

6

Status
PSU 1

(green)

On

Operating condition

Off

Power supply unit off

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Installation

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4 Installation

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4.1 Package Contents

Your CPU Switch package contains the following items:

 CPU Switch device
 2x Country specific power cord
 Quick Setup
 1x VGA cable (2.0 m, VGA connector to VGA connector)

 1x USB cable (1.8 m, type A to type B)

 2x Stereo jack cable (1.6 m, 3.5 mm male connector)

If anything is missing, contact your dealer.

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4.2 System Setup

First time users are recommended to setup the device in the same room
as a test setup. This will allow you to identify and solve any cabling
problems, and to experiment with your system more conveniently.

 Please verify that interconnect cables, interfaces and handling of the

devices comply with the requirements (see Chapter 7, Page 39).

1. Switch off all devices.

2. Connect the CPU Switch to either a KVM extender CON Unit or a
KVM matrix via the interconnect cable(s).

3. Connect the sources (computer, CPU) to the CPU Switch using the
provided cables. Please ensure the cables are not strained.

4. Connect at least one provided power cord to the CPU Switch.

5. Power up the system.

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4.3 Example Applications

This section illustrates typical installations of CPU Switches:

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CPU Switch

1 VGA sources (Computer, CPU)
2 CPU Switch (as CPU Unit)
3 KVM matrix (optional)
4 KVM extender CON Unit
5 Console (monitor, keyboard, mouse)

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Configuration

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5 Configuration

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5.1 Command Mode

The CPU Switch has a Command Mode that allows several functions via
keyboard command during normal use.

To enter Command Mode use a 'Hot Key' sequence and to exit Command
Mode, press <Esc>. While in Command Mode, the LEDs Shift and Scroll
on the console keyboard will flash.

In Command Mode normal keyboard and mouse operation will cease.
Only selected keyboard commands are available.

If no keyboard command is executed within 10 s after activating
Command Mode, it will be automatically deactivated.

The following table lists the keyboard commands to enter and to exit
Command Mode and to change the 'Hot Key' sequence:

Function

Keyboard Command

Enter Command Mode
(default)

2x <Left Shift> (or 'Hot Key')
Exit Command Mode

<Esc>

Change 'Hot Key' sequence

<current 'Hot Key'>, <c>,
<new 'Hot Key' code>, <Enter>
Until 2011-30-09:
<Left Ctrl> + <Left Shift> + <c>,

<'Hot Key' Code>, <Enter>

<Key> + <Key> Press keys simultaneously
<Key>, <Key> Press keys successively
2x <Key> Press key quickly, twice in a row

(similar to a mouse double-click)

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The 'Hot Key' sequence to enter Command Mode can be changed. The
following table lists the 'Hot Key' Codes for the available key sequences:

'Hot Key' Code

'Hot Key'

0

Freely selectable (2012-01-12)

2

2x <Scroll>

3

2x <Left Shift>

4

2x <Left Ctrl>

5

2x <Left Alt>

6

2x <Right Shift>

7

2x <Right Ctrl>

8

2x <Right Alt>

In a KVM switch configuration, choose different 'Hot Keys' for the
KVM Extender and the Draco CPU Switch.

Set freely selectable 'Hot Key' (exemplary)

In order to set a freely selectable 'Hot Key' (e.g. 2x <Space>), use the
following keyboard sequence:

<current 'Hot Key'>, <c>, <0>, <Space>, <Enter>

Reset 'Hot Key'

In order to set a 'Hot Key' back to default settings of the extender, press
the key combination <Right Shift> + <Del> within 5 s after switching on the
CON unit or plugging in a keyboard.

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5.2 Control via Keyboard

The CPU Switch connected to a KVM extender KVM extender CON Unit
offers the possibility for control via keyboard.

For this purpose the CPU Switch is equipped with its own Command
Mode that can be used to activate various functions by keyboard
commands and to control the integrated On-screen Display (OSD).

The Command Mode is entered by a keyboard sequence ('Hot Key') and
can be closed using the key <Esc>. When Command Mode is activated,
the keyboard LEDs Shift and Scroll are flashing.

Configuration

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Direct Control

The following table contains the keyboard commands for opening and
closing the Command Mode and for direct control of various converter
functions.

Function

Keyboard Command

Activate Command Mode (default)

2x <Left Shift> (or 'Hot Key'), <v>

Exit Command Mode

<Left Shift> + <Esc>

Configure video settings
automatically (only with VGA /
RGB / EGA input)

2x <Left Shift>, <v>, <a>
Switch to port 1

2x <Left Shift>, <v>, <1>, <Enter>

Switch to port 2

2x <Left Shift>, <v>, <2>, <Enter>

Switch to port 3

2x <Left Shift>, <v>, <3>, <Enter>

Switch to port 4

2x <Left Shift>, <v>, <4>, <Enter>

Switch to port 5

2x <Left Shift>, <v>, <5>, <Enter>

Switch to port 6

2x <Left Shift>, <v>, <6>, <Enter>

Switch to port 7

2x <Left Shift>, <v>, <7>, <Enter>

Switch to port 8

2x <Left Shift>, <v>, <8>, <Enter>

OSD Control

The following table contains the keyboard commands for entering and
exiting the OSD and for navigation and configuration.

Function

Keyboard Command

Open OSD window

2x <Left Shift>, <v>, <o>

Close OSD window

<Esc>

Navigation down in the menu

<Cursor down>

Navigation up in the menu

<Cursor up>

Menu selection

<Enter>

Leave sub menu

<Backspace>

Change of settings in sub menus
or selection of parameter values

<Cursor right> or <Cursor left>

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5.3 On Screen Display (OSD)

All settings of the CPU Switch can be adjusted via the on screen display
(OSD).

General Structure of the OSD:

The left column shows the range of the main menu, the right column
shows the current submenus with the respective configuration options.

The various configuration and setting options of the CPU Switch are
described below:

Configuration

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5.3.1 Main Menu Item 'Color Settings'

This menu offers color specific settings and configurations for the CPU
Switch.

Menu View 'Color Settings'

Menu Item

Description

Brightness

Adjust brightness of the picture

Contrast

Adjust contrast of the picture

Hue

Change and adjust hue of the picture
(only selectable for video input signals).

Saturation

Adjust saturation of the picture
(only selectable for video input signals).

Sharpness

Adjust sharpness of the picture

Color

Open submenu 'Color' (see Chapter 5.3.1.1,
Page 22).

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5.3.1.1 Submenu 'Color'

This submenu offers advanced color settings for the picture (VGA / RGB /
EGA input only).

Menu View 'Color'

Menu Item

Description

Auto Color

Adjust color values automatically

Color Temperature

Adjust color temperature of the picture

sRGB

Activate the use of the standard RGB color range
(Color optimization for tube monitors).

Red

Adjust red color range

Green

Adjust green color range

Blue

Adjust blue color range

Configuration

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5.3.2 Main Menu Item 'Picture Settings'

This menu offers specific picture settings at the CPU Switch.

Menu View 'Picture Settings'

Menu Item

Description

Auto Configuration

Configure picture settings automatically
(VGA / RGB / EGA input only).

Phase

Adjust pixel phase i.e. the best position for the
analog / digital conversion within one pixel
(VGA / RGB / EGA input only).

Example for incorrect pixel phase

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Menu Item

Description

Clock

Adjust pixel clock. The pixel clock shows the
maximum number of the pixels that are horizontally
displayable. Non-visible and inactive pixels are
counted in (VGA / RGB / EGA input only).

Example for a wrong pixel clock.

Width

Adjust width of the picture with the number of
pixels.

Height

Adjust height of the picture with the number of
pixels.

Display Control

Open submenu 'Display Control' (see
Chapter 5.3.2.1, Page 25).

Configuration

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5.3.2.1 Submenu 'Display Control'

This submenu offers control options for the display of the picture.

Menu View 'Display Control'

Menu Item

Description

Display Image

Select display option:
 'Auto': Scale picture automatically to the

maximum value

 'Aspect': Adjust aspect ratio manually
 '1:1': Show picture in original size with a black

border

 'Panoramic': Scale picture to a non-linear

value (only if there is video input)

Aspect Ratio

Select aspect ratio:
'Auto', '4:3', '14:9', '16:9' or '>16:9'
(only if 'Display Image' is set to 'Aspect Ratio').

Zoom

Zoom picture and determine position of
enlargement (not available in combination with
onboard DVI-I extenders).

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5.3.3 Main Menu Item 'Input Settings'

This menu offers specific settings for Media- / DVIConverter inputs.CPU
Switch.

Menu View 'Input Settings'

Menu Item

Description

Input Select

Select input signal

Channel

 For CVBS input signal:

Select Composite channel.

 For EGA input:

Select EGA, CGA or MDA input signal.

Select Resolution

Select video mode compatible to input signal
(see Chapter 7, Page 39for supported video
modes).

Save settings by leaving the menu (monitor goes
blank for a short time).

Sync Options

Select type of synchronization of the RBG signal.
The type depends from the incoming RGB signal.

 'Auto': Automatic adjustment
 'Composite (CS)' or 'Sync On Green (SOG)':

Manual adjustment in case of picture failures
(VGA / RGB input only)

Video Input

Display of selected video mode

Configuration

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5.3.4 Main Menu Item 'Output Settings'

This menu offers specific settings for the output of the CPU Switch.

Menu View 'Output Settings'

Menu Item

Description

Output

Select output resolution:
 'DDC': Use preferred resolution of the

monitor's DDC at the output

 'Select': Select from predefined output

resolutions in the menu item 'Resolution'
 '1:1': Use input resolution as output resolution
Note:
The option "DDC" is not available in onboard DVI-I

extenders.

Resolution

If 'Output' is set to 'Select': Select from predefined
output resolutions.

A higher resolution can be selected at any time. If
you select a lower resolution, the number of output
pixels needs to comply with the following rule:

 Horizontally: At least 50%
 Vertically: At least 33%

(Not available with onboard DVI-I extenders.)

Display Position

Adjust position of picture manually

Video Output

Display of the selected output resolution

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 Graphic contents with up to 2 mega pixels are scalable (1920x1080).
 For the scaling of the 1920x1200 resolution, restrictions apply and the

video will be transmitted 1:1, if applicable.

 If you scale resolutions of 1280x1024 or higher, there will be a

reduction of color depth to 16 bit YCbCr.

Configuration

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5.3.5 Main Menu Item 'General Settings'

This menu offers general settings for the CPU Switch.

Menu View 'General Settings'

Menu Item

Description

DDC

Open submenu 'DDC' (see Chapter 5.3.5.1,
Page 30).

Miscellaneous

Open submenu 'Miscellaneous' (see
Chapter 5.3.5.2, Page 31).

Device Address

Assign device ID.
The device ID clearly identifies the device for the

infrared remote control so that settings can be
made for a specific device only.

Manage Settings

Write the existing device settings on the internal
memory of the CPU Switch ('Save'). These settings
can be loaded again if required ('Load'), e.g. after a
firmware update.

T-Adjust

Compensate picture failures due to device
temperature

Save device settings if you have made extensive settings or if you want to
perform a firmware update.

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5.3.5.1 Submenu 'DDC'

This submenu offers DDC specific settings. DDC information is relevant to
output settings for computer or CPU connection.

Menu View 'DDC'

Menu Item

Description

Read DDC

Use the monitor DDC as the device DDC and save
it as DVI or VGA DDC.

Change DDC

Save the device DDC as DVI or VGA DDC

Factory DDC

Use default DDC 'VGA2DVI' as device DDC

MON:

Display of name and type of monitor DDC

DEV:

Display of name and type of the device's DDC that
is provided at the DVI-I input by the CPU Switch.

When saving the DDC as DVI or VGA DDC, the selected type of DDC
must match the video signal of the source (VGA or DVI) (see
Chapter 5.3.3, Page 26: Menu item 'Input Select').

Configuration

2017-03-31 31

5.3.5.2 Submenu 'Miscellaneous'

This submenu offers various device specific settings.

Menu View 'Miscellaneous'

Menu Item

Description

Auto Adjust

Activate or deactivate the automatic configuration
of picture settings after changing the video mode.

Refresh Rate

Change refresh rate if output is set to 'DDC'.

Video Processing

Not used

VBI Processing

Not used

OSD Configuration

Configure OSD display on screen.

Factory Reset

Reset device to factory default (confirmation dialog)

Draco CPU Switch

32 2017-03-31

Submenu 'OSD Configuration'

This submenu offers various settings for the OSD display.

Menu View 'OSD Configuration'

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Menu Item

Description

OSD Timer

Activate and select time of inactivity after which
OSD is closed automatically.

OSD Position

Adjust vertical and horizontal OSD position on
screen.

OSD Transparency

Adjust OSD transparency

OSD Zoom

Activate scaling of OSD display

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Operation

2017-03-31 33

6 Operation

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6.1 Optimization of Picture Settings

All common video modes are pre-installed in an internal table of the CPU
Switch. If the input signal corresponds to one of these video modes, the
signal will be automatically detected and the picture will be displayed.

If picture quality is not an optimal or no picture is displayed, proceed as
follows:

1. Optimize the output settings (see Chapter 6.1.1, Page 33). Thus, the
picture display will be adapted to the properties of the monitor.

2. Optimize the input settings (see Chapter 6.1.2, Page 34). Check if the
automatically detected video mode corresponds to your input signal.
Alternatively, you can manually select the most suitable video mode,
even if you have an unknown input signal.

3. Optimize the picture settings for your input signal (see Chapter 6.1.3,
Page 35).

In the unlikely event that the picture cannot be optimized using the
controls provided, please fill in and return the video mode questionnaire
(Download) so that a customer specific video mode can be created.

6.1.1 Optimization of Output Settings

1. For an analog input signal, display a picture with as much detail as
possible on your graphic source, e.g. a text with black letters on a
white ground (or vice versa).

2. Open the OSD with the infrared remote control.

3. Select 'Output Settings' in the main menu (see Chapter 5.3.4,
Page 27).

4. Select the output resolution in the menu item 'Output':

– Select 'DDC' to use the preferred resolution of the monitor DDC.
– If the preferred resolution of the device DDC does not result in an

optimal picture, select 'Factory' and from the menu item
'Resolution' the most suitable resolution for the monitor.

5. Exit the OSD.
A window appears to save settings. This may take a few seconds.

6. Save the settings.

Draco CPU Switch

34 2017-03-31

6.1.2 Optimization of Input Settings

For certain analog input signals (VGA / RGB / EGA), if picture quality is
not optimal or no picture is displayed, proceed as follows:

1. Open the OSD with the infrared remote control.

2. Select 'Input Settings' in the main menu (see Chapter 5.3.3, Page 26).

3. Test the recommended resolutions that are listed in the menu item
'Select Resolution'. The menu item is inactive, if there is only one
recommended resolution.

4. Run the automatic picture adjustment:
– Select 'Picture Settings' in the main menu (see Chapter 5.3.2,

Page 23).

– Select the menu item 'Auto Configuration'. Thereby picture size

might change.

5. Check the test picture: If the vertical lines are displayed clearly,
without smear or tremble, the setting has been successful.

6. Exit the OSD.
A window appears to save settings. This can take a few seconds.

7. Save the settings.

Operation

2017-03-31 35

6.1.3 Optimization of Picture Settings

Should Auto Configuration fail to provide the optimal picture, it can be
adjusted manually by following this procedure:

1. Select 'Picture Settings' in the main menu.

2. Modify the values in the menu items 'Clock' and 'Phase' until all
picture corruption has disappeared.

3. If the picture is displaced:
– Select the menu item 'Display position' in the main menu item

'Output Settings' and position the picture in the upper left corner
of the monitor.

– Select the menu items 'Width' and 'Height' in the main menu item

'Picture Settings' and modify the values for width and height of
the picture until the monitor is completely filled by the picture.

4. Exit the OSD.
A window appears to save settings. This can take a few seconds.

5. Save the settings.

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6.2 Download of DDC Information

Loading DDC information is only relevant if you want to connect a VGA
source. By default, the factory DDC information is reported to the source
(computer, CPU). If these settings do not lead to a satisfying result, the
DDC information of the connected monitor can be downloaded and stored
internally.

There are two options to load the DDC information of the connected
monitor:

 By means of a keyboard connected to the KVM extender CON Unit

(see Chapter 6.2, Page 35).

 By means of the 'Read DDC' command in the OSD (see Chapter 6.2,

Page 35).

Draco CPU Switch

36 2017-03-31

6.2.1 Download of DDC via Keyboard

You can load the DDC information of the console monitor via keyboard
command under operating conditions.

1. Switch to the respective port of the CPU Switch to be used.

2. Enter Command Mode with the 'Hot Key' (see Chapter 5.1, Page 17).

3. Press the key <a> to download the DDC information of the console
monitor.

At the same time Command Mode is closed and the keyboard LEDs
return to previous status.

4. Restart the switched source (computer, CPU)
The video mode has been readjusted. Screen quality should be

optimal. The CPU should now show the console monitor as the
current screen, together with the available video resolutions.

The DDC information of the console monitor was loaded once.
Reloading is possible by repeating the operation.

When transmitting DDC information via keyboard, this will be only
provided to the VGA input that is currently switched on the CPU Switch.

6.2.2 Download of DDC via OSD

1. Open the OSD with the infrared remote control.

2. Select 'General Settings' in the main menu (see Chapter 5.3, Page

20).

3. Select the menu item 'Read DDC' in the submenu 'DDC'.

Select 'DDC' in the menu item 'Factory DDC' to receive the default DDC
information.

4. Save the DDC as DVI or VGA DDC matching the input video signal.
The DDC information of the connected monitor is saved in the

CPU Switch in the selected format and is displayed at the bottom of
the OSD menu under 'DEV:'.

The source (computer, CPU) can read the DDC information of the
monitor and display the available video resolutions.

Operation

2017-03-31 37

6.2.3 Further DDC settings

If there are special requirements, DDC information can be imported or
exported at the device.

Therefore, please connect the device to a computer via mini USB cable.

1. Connect the power supply to the CPU Switch.

2. Connect the CPU Switch to a computer via mini USB cable.
The CPU Switch is now available as a flash drive at the computer with

the serial number of the respective device.

Export of DDC Information

3. Now you can use the DDC files "DDC-MON.BIN" of the monitor and
"DDC-DEV.BIN" of the CPU Switch by copying them to a local data
storage device.

To open the binary file, you have to install a suitable software. Therefore
contact your dialer.

Import of DDC Information

4. Copy special DDC information as a binary file to the flash drive of the
CPU Switch.

The existing DDC information in the file "DDC-EDID.BIN" will be
overwritten and is now available exclusively for the active port.

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6.3 Shared Operation

CPU Units with a redundant connector for interconnect cables offer the
possibility for a competing control by two connected CON Units.

Taking over control is performed using a keyboard and/or mouse. The
release timer function determines the release time of the input devices at
one of the CON Units after that control can be taken over from the second
CON Unit.

In order to configure a redundant CPU Unit for the operation with two
competing CON Units, proceed as follows:

1. Connect a redundant CPU Unit to any source (computer, CPU) by
using a mini USB connection.

2. Open the file "Config.txt" that is located on the appearing flash drive
of the extender.

Draco CPU Switch

38 2017-03-31

3. Activate the release timer by writing the parameter RELEASETIME=n
into the second line.
The variable "n" defines the time in seconds and has to be replaced
by the numbers 0 to 9 (e.g. RELEASETIME=5). If this parameter is
not activated at all, the release time is set to 2 seconds by default.
The parameter RELEASETIME=X deactivates the shared operation.

4. Save your changes.

5. Reboot the CPU Unit.

Example View – Config.txt

When using redundant CPU Units in combination with a KVM matrix, the
function of competing control will be automatically deactivated in the
extender and will have to be performed by the KVM matrix.

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Specifications

2017-03-31 39

7 Specifications

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7.1 Interfaces

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7.1.1 VGA

The video interface supports the VGA protocol. All signals that comply to
DVI-D Single Link norm can be transmitted. This includes e.g. monitor
resolutions such as 1920x1200@60Hz, Full HD (1080p) or 2K HD (up to
2048x1152). Data rate is limited to 165 MPixel/s.

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7.1.2 USB-HID

Our devices with USB-HID interface support a maximum of two devices
with USB-HID protocol. Each USB-HID port provides a maximum current
of 100 mA.

Keyboard

Compatible with most USB keyboards. Certain keyboards with additional
functions may require custom firmware to operate. Keyboards with an
integral USB Hub (Mac keyboards e.g.) are also supported.

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7.1.3 USB 2.0 (transparent)

CPU Switch models with transparent USB 2.0 support allow the
connection of all types of USB 2.0 devices (without restriction). USB 2.0
data transfer is supported, depending on the upgrade module, with USB
high speed (max. 480 Mbit/s) or USB full speed (max. 36 Mbit/s).

Each USB full speed port provides a maximum current of 500 mA (high
power). When using a USB high speed interface with 4 USB ports,
respectively 2 connectors provides a maximum of 500 mA (high power)
and 2 connectors a maximum of 100 mA.

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Draco CPU Switch

40 2017-03-31

7.1.4 Analog Audio Interface

The analog audio option supports a bidirectional stereo audio

transmission, in nearly CD quality.
The audio interface is a 'line level' interface and it is designed to transmit

the signals of a sound card (or another 'line level' device) as well as to
allow the connection of active speakers to the CON Unit.

Stereo audio can be transmitted bidirectionally at the same time.

Connection of a microphone:

Connect the microphone to the 'audio' input of the CON Unit. There are
two ways to establish this connection:

 The output of the CPU Unit is connected with the microphone input of

the sound card (red). Adjust the sound card to provide an additional
amplification (20 dB).

 The output of the CPU Unit is connected to the audio input of the

sound card (blue). Choose this connection if the microphone has its
own pre-amplifier.

The CON Unit can do the pre-amplification of the microphone as well.
Open the CON Unit, locate the 'MIC' jumper on the audio board and close
the pins.

Transmission Format

Digitized virtually CD quality audio
(16 bit, 38.4 KHz)

Signal Level

Line-Level (5 Volt Pk-Pk maximum)

Input Impedance

47 KOhm

Connections CPU Unit

2x 3.5 mm stereo jack plug
(audio in & audio out)

Connections CON Unit

2x 3.5 mm stereo jack plug
(audio in & audio out)

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7.1.5 RJ45 (Interconnect)

Communication between Cat X devices requires a 1000BASE-T
connection.

Connector wiring must comply with EIA/TIA-568-B (1000BASE-T), with
RJ45 connectors at both ends. All four cable wire pairs are used.

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Specifications

2017-03-31 41

7.1.6 Fiber SFP Type LC (Interconnect)

Communication of fiber devices is performed via Gigabit SFPs that are
connected to suitable fibers fitted with connectors type LC (see Chapter

7.2.2, Page 42).

The correct function of the device can only be guaranteed with SFPs
provided by the manufacturer.

SFP modules can be damaged by electrostatic discharge (ESD).
 Please consider ESD handling specifications.

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7.2 Interconnect Cable

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7.2.1 Cat X

A point-to-point connection is required. Operation with several patch fields
is possible. Routing over an active network component, such as an
Ethernet Hub, Router or Matrix, is not allowed.

 Avoid routing Cat X cables along power cables.

To maintain regulatory EMC compliance, correctly installed shielded Cat X
cable must be used throughout the interconnection link.

To maintain regulatory EMC compliance, all Cat X cables need to carry
ferrites on both cable ends close to the device.

Type of Interconnect Cable

The CPU Switch requires interconnect cabling specified for Gigabit
Ethernet (1000BASE-T). The use of solid-core (AWG24), shielded, Cat 5e
(or better) is recommended.

Cat X Solid-Core Cable
AWG24

S/UTP (Cat 5e) cable according to EIA/TIA­568-B. Four pairs of wires AWG24.
Connection according to EIA/TIA-568-B
(1000BASE-T).

Cat X Patch Cable
AWG26/8

S/UTP (Cat 5e) cable according to EIA/TIA­568-B. Four pairs of wires AWG26/8.
Connection according to EIA/TIA-568-B
(1000BASE-T).

The use of flexible cables (patch cables) type AWG26/8 is possible,
however the maximum possible extension distance is halved.

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Draco CPU Switch

42 2017-03-31

Maximum Acceptable Cable Length

Cat X Installation Cable
AWG24

140 m (400 ft)

Cat X Patch Cable
AWG26/8

70 m (200 ft)

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7.2.2 Fiber

A point-to-point connection is necessary. Operation with multiple patch
panels is allowed. Routing over active network components, such as
Ethernet Hubs, Switches or Routers, is not allowed.

Type of Interconnect Cable

(Cable notations according to VDE)

Type of cable

Specifications

Single-mode 9μm

 Two fibers 9μm
 I-V(ZN)H 2E9 (in-house patch cable)
 I-V(ZN)HH 2E9 (in-house breakout cable)
 I/AD(ZN)H 4E9 (in-house or outdoor

breakout cable, resistant)

 A/DQ(ZN)B2Y 4G9 (outdoor cable, with

protection against rodents)

Multi-mode 50μm

 Two fibers 50μm
 I-V(ZN)H 2G50 (in-house patch cable)
 I/AD(ZN)H 4G50 (in-house or outdoor

breakout cable, resistant)

Multi-mode 62.5μm

 Two fibers 62.5μm
 I-V(ZN)HH 2G62.5 (in-house breakout

cable)

 A/DQ(ZN)B2Y 4G62.5 (outdoor cable,

with protection against rodents)

Maximum Acceptable Cable Length

Type of cable

Maximum Acceptable Cable Length

Single-mode 9μm

10,000 m (32,800 ft)

Multi-mode 50μm (OM3)

1,000 m (3,280 ft)

Multi-mode 50μm

400 m (1,300 ft)

Multi-mode 62.5μm

200 m (650 ft)

Specifications

2017-03-31 43

If you use single-mode SFPs with multi-mode fibers, you normally can
double the maximum acceptable cable length.

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Type of Connector

Connector

LC Connector

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7.3 Connector Pinouts

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Connector VGA

Picture

Pin

Signal

Pin

Signal

1

RED

9

KEY/PWR

2

GREEN

10

GND

3

BLUE

11

ID0/RES

4

ID2/RES

12

ID1/SDA

5

GND

13

HSync

6

RED_RTN

14

VSync

7

GREEN_RTN

15

ID3/SCL

8

BLUE_RTN

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Connector Mini USB Type B

Picture

Pin

Signal

Color

1

VCC (+5VDC)

Red

2

Data –

White

3

Data +

Green

4

n.c.

– 5 GND

Black

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3.5 / 6.35 mm Stereo Jack Plug

Picture

Pin

Signal

1

GND

2

Audio IN / OUT L

3

Audio IN / OUT R

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Draco CPU Switch

44 2017-03-31

RJ45

Picture

Pin

Signal

Pin

Signal

1

D1+

5

D3–

2

D1–

6

D2–

3

D2+

7

D4+

4

D3+

8

D4–

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Fiber SFP Typ LC

Picture

Diode

Signal

1

Data OUT

2

Data IN

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Power Supply

Picture

Pin

Signal

Inside

VCC (+5VDC)

Outside

GND

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Specifications

2017-03-31 45

7.4 Power Supply

AC Power Supply

Model

Max. Current

Max. Voltage

Frequency

L484-8VECWR

700 mA

100-240 V

50/60 Hz

L484-8VESWR

700 mA

100-240 V

50/60 Hz

DC-Spannungsversorgung

Model

Max. Current

Max. Voltage

L484-8VECWR

5.000 mA

5 VDC

L484-8VESWR

5.000 mA

5 VDC

Power Requirement

 L484-8VECWR: max. 3.300 mA
 L484-8VESWR: max. 3.350 mA

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7.5 Environmental Conditions

Operating Temperature

41 to 113°F (5 to 45°C)

Storage Temperature

–13 to 140°F (–25 to 60°C)

Relative Humidity

Max. 80% non-condensing

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7.6 Size

L484-8VECWR / -8VESWR

CPU Switch

444 x 143 x 43 mm (17.5" x 5.6" x 1.7")

Shipping Box

550 x 372 x 155 mm (21.7" x 14.6" x 6.1")

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7.7 Shipping weight

L484-8VECWR / -8VESWR

CPU Switch

2.1 kg (4.6 lb)

Shipping Box

3.1 kg (6.8 lb)

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46 2017-03-31

8 Troubleshooting

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8.1 Blank Screen

CPU Module

Rear View

Diagnosis

Possible Reason

Measure

LED 4/6 off

Power Supply

 Check power supply units and

the connection to the power
network

LED 3 off

No monitor detected

 Check connection, length and

quality of the DVI-D cable to
monitor, tighten cable
thumbscrews.

LED 5 or 7 violet

No video signal detected
from CPU Unit

 Check VGA cable to CPU.
 Download DDC information from

console monitorn (see Chapter

6.2, Page 35).
Reboot CPU if necessary.

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Troubleshooting

2017-03-31 47

8.2 Picture

Diagnosis

Possible Reason

Measure

Incorrect picture
display

Incomplete or too long
connection to monitor

 Check connection, length and

quality of the DVI-D cable to
monitor, tighten cable
thumbscrews.

Transmission
parameters not suitable
or not optimally set for
conditions.

 Run 'Auto Configuration'

(see Chapter 5.3.2, Page 23).

 If necessary, set parameters for

picture settings manually (e.g.
phase and clock) (see
Chapter 5.3.2, Page 23).

Parts of the
picture are
missing

Incorrect picture size

 Optimize picture settings (see

Chapter 6.1, Page 33).

Horizontal
picture jitter

Incorrect phase and
clock

 Readjust phase and clock

manually (see Chapter 5.3.2,
Page 23).

Characters are
smeared

Incorrect phase

 Readjust phase manually (see

Chapter 5.3.2, Page 23).

Fine vertical
lines are
missing

Incorrect clock

 Readjust clock manually (see

Chapter 5.3.2, Page 23).

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Draco CPU Switch

48 2017-03-31

8.3 USB-HID

CPU Module

Rear View

Diagnosis

Possible Reason

Measure

Keyboard LEDs
Shift and Scroll
are blinking

Keyboard in Command
Mode

 Press <Esc> to leave Command

Mode.

CPU Unit:
LED 5/7 green
or violet

No USB connection to
CPU

 Check connection of USB cable

to CPU; select another USB port
if necessary.

 USB- und Netzkabel entfernen

und CPU Unit neu starten.
Netzkabel zuerst wieder
anschließen.

USB device
without function

No USB-HID device

 Connect USB-HID device.

USB-HID device is not
supported

 Contact dealer if necessary.

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Troubleshooting

2017-03-31 49

8.4 Analog Audio

Diagnosis

Possible Reason

Measure

CON Unit:
No signal at
audio output

No audio connection to
CPU / audio source

 Connect analog audio source.
 Check audio cable.

No Signal

 Switch analog audio source on.
 Activate analog output at CPU /

audio source.

No audio connection to
audio sink
(e.g. speakers)

 Connect analog audio sink and

switch it on.

 Check connection of audio cable.

CPU Unit:
No signal at
audio output
(microphone)

No audio connection to
audio source
(microphone)

 Connect analog audio source

(microphone).

 Check connection of audio cable.

No signal

 Switch analog audio source on.
 Activate analog output at audio

source.

No audio connection to
audio sink (e.g. CPU)

 Check connection to CPU.
 Check connection of audio cable.
 Check audio configuration.

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Draco CPU Switch

50 2017-03-31

9 Technical Support

Prior to contacting support please ensure you have read this manual, and
then installed and set-up your CPU Switch as recommended.

9.1 Support Checklist

To efficiently handle your request it is necessary that you complete a
support request checklist (Download). Please ensure that you have the
following information available before you call:

 Company, name, phone number and email
 Type and serial number of the device (see bottom of device)
 Date and number of sales receipt, name of dealer if necessary
 Issue date of the existing manual
 Nature, circumstances and duration of the problem
 Components included in the system (such as graphic source/CPU,

OS, graphic card, monitor, USB-HID/USB 2.0 devices, interconnect
cable) including manufacturer and model number

 Results from any testing you have done

9.2 Shipping Checklist

1. To return your device, contact your dealer to obtain a RMA number
(Return-Material-Authorization).

2. Package your devices carefully, preferably using the original box.
Add all pieces which you received originally.

3. Note your RMA number visibly on your shipment.

Devices that are sent in without a RMA number cannot be accepted. The
shipment will be sent back without being opened, postage unpaid.

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2017-03-31 51

10 Certificates

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10.1 CE Declaration Of Conformity

The products listed below in the form as delivered comply with the
provisions of the following European Directives:

2014/30/EU Council Directive on the approximation of the laws of
the Member States relating to electromagnetic
compatibility

2014/35/EU Council Directive on the harmonization of the laws of the

Member States relating to the making available on the
market of electrical equipment designed for use within
certain voltage limits

CE Marking
Product list:
484 Series

The products comply with the following harmonized standards for
Information Technology Equipment:

 EN 55022: 2010/AC:2011 (Class A)
 EN 55024:2010 + A1:2015
 EN 61000-3-2:2014
 EN 61000-3-3:2013
 EN 61000-6-2:2005
 EN 60950-1:2006/A2:2013

Manufacturer:
IHSE GmbH

Maybachstrasse 11
88094 Oberteuringen
Deutschland

Oberteuringen, October 1st, 2016
The Management

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Use in a Domestic Environment

This is a Class A product. In a domestic environment, this product may
cause radio interference in which case the user may be required to take
adequate measures.

This declaration certifies the conformity to the specified directives but
contains no assurance of properties. The safety instructions and
installation guidelines noted in this manual shall be considered in detail.
Compliance with the specifications for cable lengths and types is
mandatory.

10.2 North American Regulatory Compliance

This equipment has been found to comply with the limits for a Class A
digital device, pursuant to Part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference
when the equipment is operated in a commercial environment. This
equipment generates, uses, and can radiate radio frequency energy and,
if not installed and used in accordance with the instruction manual, may
cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference in
which case the user will be required to correct the interference at his own
expense.

Changes or modifications not expressly approved by the party responsible
for compliance could void the user’s authority to operate the equipment.

Shielded cables must be used with this equipment to maintain compliance
with radio frequency energy emission regulations and ensure a suitably
high level of immunity to electromagnetic disturbances.

All power supplies are certified to the relevant major international safety
standards.

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10.3 WEEE

The manufacturer complies with the EU Directive 2012/19/EU on the
prevention of waste electrical and electronic equipment (WEEE).

The device labels carry a respective marking.

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2017-03-31 53

10.4 RoHS/RoHS 2

This device complies with the Directive 2011/65/EU of the European
Parliament and of the council of 8 June 2011 on the restriction of the use
of certain hazardous substances in electrical and electronic equipment
(RoHS 2, RoHS II).

The device labels carry a respective marking.

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11 Glossary

The following terms are commonly used in this guide or in video and KVM
technology:

Term

Explanation

AES/EBU

Digital audio standard that is officially known as
AES3 and that is used for carrying digital audio
signals between devices.

Cat X

Any Cat 5e (Cat 6, Cat 7) cable

CGA

Color Graphics Adapter (CGA) is an old analog
graphic standard with up to 16 displayable colors and
a maximum resolution of 640x400 pixels.

Component
Video

Component Video (YPbPr) is a high-quality video
standard that consists of three independently and
separately transmittable video signals, the luminance
signal and two color difference signals.

Composite Video

Composite Video is also called CVBS and it is part of
the PAL TV standard.

CON Unit

Component of a KVM Extender or Media Extender to
connect to the console (monitor(s), keyboard and
mouse; optionally also with USB 2.0 devices)

Console

Keyboard, mouse and monitor

CPU Unit

Component of a KVM Extender or Media Extender to
connect to a source (computer, CPU)

CVBS

The analog color video baseband signal (CVBS) is
also called Composite Video and it is part of the PAL
TV standard.

DDC

Display Data Channel (DDC) is a serial
communication interface between monitor and
source (computer, CPU). It allows a data exchange
via monitor cable and an automatic installation and
configuration of a monitor driver by the operating
system.

DisplayPort

A VESA standardised interface for an all-digital
transmission of audio and video data. It is
differentiated between the DisplayPort standards 1.1
and 1.2. The signals have LVDS level.

Dual Access

A system to operate a source (computer, CPU) from
two consoles

Glossary

2017-03-31 55

Term

Explanation

Dual Link

A DVI-D interface for resolutions up to 2560x2048 by
signal transmission of up to 330 MPixel/s (24-bit)

Dual-Head

A system with two video connections

DVI

Digital video standard, introduced by the Digital
Display Working Group (http://www.ddwg.org). Single
Link and Dual Link standard are distinguished. The
signals have TMDS level.

DVI-I

A combined signal (digital and analog) that allows
running a VGA monitor at a DVI-I port – in contrast to
DVI-D (see DVI).

EGA

The Enhanced Graphics Adapter (EGA) is an old
analog graphic standard, introduced by IBM in 1984.
A D-Sub 9 connector is used for connection.

Fiber

Single-mode or multi-mode fiber cables

HDMI

An interface for an all-digital transmission of audio
and video data. It is differentiated between the HDMI
standards 1.0 to 1.4a.

The signals have TMDS level.

KVM

Keyboard, video and mouse

Mini-XLR

Industrial standard for electrical plug connections
(3 pole) for the transmission of digital audio and
control signals

Multi-mode

62.5µ multi-mode fiber cable or 50µ multi-mode fiber
cable

OSD

The On-Screen-Display is used to display information
or to operate a device.

Quad-Head

A system with four video connections

RCA (Cinch)

A non-standard plug connection for transmission of
electrical audio and video signals, especially with
coaxial cables

S/PDIF

A digital audio interconnect that is used in consumer
audio equipment over relatively short distances.

SFP

SFPs (Small Form Factor Pluggable) are pluggable
interface modules for Gigabit connections. SFP
modules are available for Cat X and fiber
interconnect cables.

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Term

Explanation

Single Link

A DVI-D interface for resolutions up to 1920x1200 by
signal transmission of up to 165 MPixel/s (24-bit).

Alternative frequencies are Full HD (1080p), 2K HD
(2048x1080) and 2048x1152.

Single-Head

A system with one video connection

Single-mode

9µ single-mode fiber cable

S-Video (Y/C)

S-Video (Y/C) is a video format transmitting
luminance and chrominance signals separately.
Thereby it has a higher quality standard than CVBS.

TOSLINK

Standardized fiber connection system for digital
transmission of audio signals (F05 plug connection)

Triple-Head

A system with three video connections

USB-HID

USB-HID devices (Human Interface Device) allow for
data input.

There is no need for a special driver during
installation; "New USB-HID device found" is reported.

Typical HID devices include keyboards, mice,
graphics tablets and touch screens. Storage, video
and audio devices are not HID.

VGA

Video Graphics Array (VGA) is a computer graphics
standard with a typical resolution of 640x480 pixels
and up to 262,144 colors. It can be seen as a
follower of the graphics standards MDA, CGA and
EGA.

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