Kramer VS-4228 User manual

KRAMER ELECTRONICS LTD.
USER MANUAL
MODEL:
VS-4228
8-Port RS-422 Matrix Switcher
P/N: 2900-002033 Rev 5

VS-4228 – Contents
i
Contents
1Introduction 1
2Getting Started 2
2.1 Achieving the Best Performance 2
2.2 Safety Instructions 2
2.3 Recycling Kramer Products 3
3Overview 4
3.1 Defining the VS-4228 8-Port RS-422 Matrix Switcher 4
3.2 About RS-422 7
4Connecting the VS-4228 10
4.1 Connecting a PC or Controller to the RS-232 Port 11
4.2 Connecting a PC or Controller to the RS-485 Port 12
4.3 Cascading Multiple Units 12
5Operating the VS-4228 15
6Technical Specifications 17
7Default Communication Parameters 18
8Hex Codes 19
Figures
Figure 1: VS-4228 8-Port RS-422 Matrix Switcher Front Panel 5
Figure 2: VS-4228 8-Port RS-422 Matrix Switcher Rear Panel 6
Figure 3: Bi-directional Signals I 7
Figure 4: Bi-directional Signals II 7
Figure 5: Connecting the VS-4228 8-Port RS-422 Matrix Switcher 10
Figure 6: Crossed Cable RS-232 Connection 11
Figure 7: Straight Cable RS-232 Connection with a Null Modem Adapter 11
Figure 8: Cascading Units via the RS-232 Control Interface 13
Figure 9: Cascading Units via the RS-485 Control Interface 14

VS-4228 - 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 groups that are clearly defined
by function: 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 and
GROUP 11: Sierra Products.
Congratulations on purchasing your Kramer VS-4228 8-Port RS-422 Matrix
Switcher, which is ideal for the following typical applications:
Remote control of video and audio production studios
Live broadcast remote control
CCTV and other remote control applications

2
VS-4228 - Getting Started
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
Go to http://www.kramerelectronics.com/support/product_downloads.asp
to check for up-to-date user manuals, application programs, and to check
if firmware upgrades are available (where appropriate).
2.1 Achieving the Best Performance
To achieve the best performance:
Use only good quality connection cables (we recommend Kramer high-
performance, high-resolution cables) to avoid interference, deterioration in
signal quality due to poor matching, and elevated noise levels (often
associated with low quality cables)
Do not secure the cables in tight bundles or roll the slack into tight coils
Avoid interference from neighboring electrical appliances that may adversely
influence signal quality
Position your Kramer VS-4228 away from moisture, excessive sunlight and
dust
This equipment is to be used only inside a building. It may only be
connected to other equipment that is installed inside a building.
2.2 Safety Instructions
Caution:
There are no operator serviceable parts inside the unit
Warning:
Use only the power cord that is supplied with the unit
Warning:
Do not open the unit. High voltages can cause
electrical shock! Servicing by qualified personnel only
Warning:
Disconnect the power and unplug the unit from the wall
before installing
i
!
!

VS-4228 - Getting Started
3
2.3 Recycling Kramer Products
The Waste Electrical and Electronic Equipment (WEEE) Directive 2002/96/EC
aims to reduce the amount of WEEE sent for disposal to landfill or incineration by
requiring it to be collected and recycled. To comply with the WEEE Directive,
Kramer Electronics has made arrangements with the European Advanced
Recycling Network (EARN) and will cover any costs of treatment, recycling and
recovery of waste Kramer Electronics branded equipment on arrival at the EARN
facility. For details of Kramer’s recycling arrangements in your particular country
go to our recycling pages at http://www.kramerelectronics.com/support/recycling/.

4
VS-4228 - Overview
3 Overview
The VS-4228 is a high-performance bidirectional matrix switcher for RS-422
control signals. It can connect multiple ports to create from one to four bidirectional
communication groups.
In particular, the VS-4228 features:
Simple-to-connect automatic master/slave configuration
A bright LED display showing the status of the matrix switcher
Recall of up to 8 configuration setups via the non-volatile memory
Control via the front panel buttons, or remotely by RS-485 or RS-232 serial
commands transmitted by a touch screen system, PC, or other serial
controller
3.1 Defining the VS-4228 8-Port RS-422 Matrix Switcher
This section defines the VS-4228.

VS-4228 - Overview
5
VS-4228 –Overview
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Figure 1: VS-4228 8-Port RS-422 Matrix Switcher Front Panel
#
Feature
Function
1
Power Switch
Illuminated switch that turns power ON and OFF
2
MASTER Buttons
Select the MASTER to switch to the SLAVE
3
SLAVE Buttons
Select the SLAVE to which the MASTER is switched
4
ALL Button
Pressing ALL before pressing a MASTER button, connects all SLAVE devices to that MASTER
5
OFF Button
Pressing OFF after pressing a SLAVE button disconnects the MASTER. To disconnect all the SLAVE devices,
press the ALL button and then the OFF button
6
STO Button
Pressing STO (STORE) followed by an SLAVE button stores the current setting
7
RCL Button
Pressing the RCL (RECALL) button and the corresponding SLAVE key recalls a setup. The stored status
flashes. Pressing a different SLAVE button lets you view another setup. After making your choice, pressing the
RCL button again implements the new status
8
SLAVE STATUS
Labels identify a cross point between each SLAVE to which the MASTER displayed below is connected
9
MASTER STATUS
The number shows the selected MASTER switched to the SLAVE (below the corresponding SLAVE label)

6
VS-4228 - Overview
Figure 2: VS-4228 8-Port RS-422 Matrix Switcher Rear Panel
#
Feature
Function
10
RS-422 9-pin D-sub Connectors
RS-422 bi-directional ports (1-8)
11
CONTROL RS-485 Terminal Block Connector
Connector for external RS-485 control (PINOUT: G, -, +)
12
CONTROL RS-232 IN 9-pin D-sub Connector
Connect to the PC serial port
13
CONTROL RS-232 OUT 9-pin D-sub Connector
Connect to the RS-232 IN port of the next unit
14
Power Connector with Fuse
AC connector enabling power supply to the unit
6
VS-4228 –Overview

VS-4228 - Overview
7
3.2 About RS-422
RS-422 control switchers differ substantially from video and audio switchers in
both design and in operation, as Sections 3.2.1 to 3.2.6 describe.
3.2.1 Signal Terminology
Connections are between master and slave or controller and controlled devices,
rather than the regular In and Out or source and destination devices. The
difference is not merely one of semantics but a vital distinction when trying to
understand the concept of RS-422 technology.
A regular In and Out switcher has separate input and output buttons on the front
panel and separate ports for input and output connectors on the rear panel.
A master and slave control switcher, has separate master and slave buttons on
the front panel but shared master/slave connectors on the rear panel.
3.2.2 Bi-directional Signals
By using a pair of conductors, each signal travels in both directions over a
balanced line between master/slave devices, as Figure 3 illustrates:
Figure 3: Bi-directional Signals I
When a master device changes position with a slave device, the pins automatically
change, as Section 3.2.4 describes and as Figure 4 illustrates:
Figure 4: Bi-directional Signals II