Kramer Electronics, Ltd.
USER MANUAL
Model:
VM-24HDMI
2 Input 1:4 HDMI Distributor
Contents
i
Contents
1
Introduction 1
2
Getting Started 1
2.1
Quick Start 2
3
Overview 3
3.1
About HDMI 3
3.2
Defining EDID 4
3.3
Recommendations for Best Performance 5
4
Your VM-24HDMI 2 Input 1:4 HDMI Distributor 5
4.1
Using the IR Transmitter 7
5
Installing in a Rack 8
6
Using the VM-24HDMI 9
6.1
Connecting the VM-24HDMI 9
6.2
Controlling via RS-232 (for example, using a PC) 11
6.3
Operating the VM-24HDMI 11
6.4
Using the EDID Buttons 12
6.4.1 Acquiring / Changing the EDID from One Output 12
6.4.2 Acquiring the Default EDID 13
6.4.3 Acquiring the Auto-mix EDID from the Connected Outputs 13
7
Technical Specifications 14
8
Communication Protocol 15
Figures
Figure 1: VM-24HDMI 2 Input 1:4 HDMI Distributor 6
Figure 2: Connecting a VM-24HDMI 2 Input 1:4 HDMI Distributor 10
Figure 3: Connecting a PC without using a Null-modem Adapter 11
Tables
Table 1: VM-24HDMI 2 Input 1:4 HDMI Distributor Features 7
Table 2: The EDID Modes 12
Table 3: VM-24HDMI Technical Specifications 14
Table 4: Protocol Definitions 15
Table 5: Instruction Codes for Protocol 2000 16
Introduction
1
1 Introduction
Welcome to Kramer Electronics! Since 1981, Kramer Electronics has been
providing a world of unique, creative, and affordable solutions to the vast
range of problems that confront the video, audio, presentation, and
broadcasting professional on a daily basis. In recent years, we have
redesigned and upgraded most of our line, making the best even better! Our
1,000-plus different models now appear in 11 groups1 that are clearly defined
by function.
Congratulations on purchasing your Kramer VM-24HDMI 2 Input 1:4
HDMI2 Distributor! Each machine is ideal for:
Home theater, presentation and multimedia applications
Rental and staging
The package includes the following items:
VM-24HDMI
Power cord
This user manual
3
2 Getting Started
We recommend that you:
Unpack the equipment carefully and save the original box and packaging
materials for possible future shipment
Review the contents of this user manual
Use Kramer high performance high resolution cables
4
1 GROUP 1: Distribution Amplifiers; GROUP 2: Switchers and Matrix Switchers; GROUP 3: Control Systems; GROUP 4:
Format/Standards Converters; GROUP 5: Range Extenders and Repeaters; GROUP 6: Specialty AV Products; GROUP 7:
Scan Converters and Scalers; GROUP 8: Cables and Connectors; GROUP 9: Room Connectivity; GROUP 10: Accessories
and Rack Adapters; GROUP 11: Sierra Products
2 High-Definition Multimedia Interface
3 Download up-to-date Kramer user manuals from the Internet at this URL: http://www.kramerelectronics.com
4 The complete list of Kramer cables is on our Web site at http://www.kramerelectronics.com
KRAMER: SIMPLE CREATIVE TECHNOLOGY
Getting Started
2
2.1 Quick Start
This quick start chart summarizes the basic setup and operation:
Overview
3
3 Overview
Each high quality HDMI Distributor accepts one of two HDMI inputs, and
distributes the selected signal to four outputs.
The VM-24HDMI:
Supports up to 2.25Gbps bandwidth per graphic channel
1
Has the ability to read and store, in non-volatile memory
2
, the EDID3 block
from an output display device, so it can then provide the EDID information
to the HDMI source even if the display device is not connected
Lets you acquire the EDID from one output, from several connected
outputs (Auto-mix) or acquire the default EDID for fast and efficient
connection of the unit4
Is housed in a 19" 1U rack mountable enclosure and is fed from a 100-240
VAC universal switching power supply
Control the VM-24HDMI via:
The front panel buttons
The infrared remote control transmitter
The infrared remote extension cable transmitter, see section 4.1
RS-232 serial commands transmitted by a touch screen system, PC, or
other serial controller
3.1 About HDMI
High-Definition Multimedia Interface (HDMI) is an uncompressed all-digital5
audio/video interface, widely supported in the entertainment and home cinema
industry. It delivers the highest high-definition image and sound quality.
1 Suitable for resolutions up to UXGA at 60Hz, and for all HD resolutions
2 While the machine is ON
3 EDID is Extended Display Identification Data (see section 3.1 for a detailed definition)
4 Lets you use the EDID default value when no display from which to read the EDID is connected
5 Ensuring an all-digital rendering of video without the losses associated with analog interfaces and their unnecessary digital-
to-analog conversions
KRAMER: SIMPLE CREATIVE TECHNOLOGY
Overview
4
In particular, HDMI1:
Provides a simple
2
interface between any audio/video source, such as a
set-top box, DVD player, or A/V receiver and video monitor, such as a
digital flat LCD / plasma television (DTV), over a single lengthy3 cable
Supports standard, enhanced, high-definition video, and multi-channel
digital audio4 on a single cable
Transmits all ATSC HDTV standards and supports 8-channel digital
audio, with bandwidth to spare to accommodate future enhancements and
requirements
Benefits consumers by providing superior, uncompressed digital video
quality via a single cable5, and user-friendly connector
Is backward-compatible with DVI (Digital Visual Interface)
Supports two-way communication between the video source (such as a
DVD player) and the digital television, enabling new functionality such
as automatic configuration and one-button play
Has the capacity to support existing high-definition video formats (720p,
1080i, and 1080p/60), as well as standard definition formats such as
NTSC or PAL
3.2 Defining EDID
The Extended Display Identification Data (EDID6) is a data-structure,
provided by a display, to describe its capabilities to an HDMI source. The
EDID enables the VM-24HDMI to “know” what kind of monitor is
connected to the output. The EDID includes the manufacturer’s name, the
product type, the timing data supported by the display, the display size,
luminance data and (for digital displays only) the pixel mapping data.
1 HDMI, the HDMI logo and High-Definition Multimedia Interface are trademarks or registered trademarks of HDMI
licensing LLC
2 With video and multi-channel audio combined into a single cable, the cost, complexity, and confusion of multiple cables
currently used in A/V systems is reduced
3 HDMI technology has been designed to use standard copper cable construction at up to 15m
4 HDMI supports multiple audio formats, from standard stereo to multi-channel surround-sound. HDMI has the capacity to
support Dolby 5.1 audio and high-resolution audio formats
5 HDMI provides the quality and functionality of a digital interface while also supporting uncompressed video formats in a
simple, cost-effective manner
6 Defined by a standard published by the Video Electronics Standards Association (VESA)
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