Kramer VP-23C User Manual

KRAMER ELECTRONICS LTD.

USER MANUAL

MODEL:

VP-23C

Presentation Switcher

P/N: 2900-000202 Rev 3

VP-23C – Contents i

Contents

1 Introduction 1
2 Getting Started 2

2.1 Achieving the Best Performance 2

3 Overview 3

3.1 Defining the VP-23C Switcher 3

4 Installing in a Rack 7
5 Connecting the VP-23C 8

5.1 Connecting to the VP-23C via RS-232 10

6 Operating the VP-23C Presentation Switcher 12

6.1 Operating your Switcher 12

7 Technical Specifications 14
8 Default Communication Parameters 15
9 Hex Tables 16

9.1 Audio Gain Control Hex Tables 16

10 Kramer Protocol 2000 17

Figures

Figure 1: VP-23C Presentation Switcher 4
Figure 2: VP-23C Presentation Switcher – Underside View 6
Figure 3: Connecting the VP-23C Presentation Switcher 10
Figure 4: Crossed Cable RS-232 Connection 11
Figure 5: Straight Cable RS-232 Connection with a Null Modem Adapter 11

VP-23C - 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 VP-23C Presentation Switcher, which
is ideal for the following typical applications:

• Presentation and conference room systems

• Production studios, as well as rental and staging

2 VP-23C - 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

Use Kramer high performance high resolution cables
Use only the power cord that is supplied with this machine

Go to http://www.kramerelectronics.com 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 to avoid interference, deterioration

in signal quality due to poor matching, and elevated noise levels (often
associated with low quality cables)

• Avoid interference from neighboring electrical appliances that may adversely

influence signal quality

• Position your Kramer VP-23C away from moisture, excessive sunlight and

dust

i

VP-23C - Overview 3

3 Overview

The VP-23C is a high-quality presentation switcher designed for a wide variety of
presentation and multimedia applications. The VP-23C includes four switcher
groups, that combine the functions of a 2x1 switcher for composite video, a 2x1
switcher for s-Video, a 2x1 switcher for component video/UXGA, and a 4x1
switcher for VGA/UXGA type signals. Each video input has its own unbalanced
stereo audio input. There is also an independent unbalanced stereo master audio
output, which can select a signal from any of the 10 audio inputs.

In addition the VP-23C features:

• 10 selector buttons, and front panel control buttons for the master audio

output level and microphone level

• Control of each switcher group independently from the other sections

• HDTV compatibility

• Control via the front panel buttons or by RS-232 serial commands

transmitted by a touch screen system, PC, or other serial controller

• Mixing the mic with the master output signal or by muting the master output

signal

• A lock button to prevent unintentional tampering with the front panel buttons

3.1 Defining the VP-23C Presentation Switcher

This section defines the VP-23C.

4 VP-23C - Overview

Figure 1: VP-23C Presentation Switcher

VP-23C - Overview 5

# Feature Function

1 POWER Switch Illuminated switch for turning the unit ON or OFF
2

INPUT
SELECTOR

VIDEO (CV) Buttons Select the composite video / audio input (1 and 2)

3 s-VIDEO (Y/C) Buttons Select the s-Video / audio input (1 and 2)
4 COMP/UXGA Buttons Select the component video / audio input (1 and 2)

Can also be used for UXGA inputs

5 VGA/UXGA Buttons Select the VGA/UXGA video / audio input (from 1 to 4)
6

AUDIO
LEVEL

MASTER

- Button Decrease the master audio signal level
7 + Button Increase the master audio signal level
8

MIC

+ Button Increase the microphone audio signal level
9 - Button Decrease the microphone audio signal level
10 MUTE Button Press to disable/enable the Master Audio output

Except for the microphone signal in the MIX mode

11 MIX Button Press to toggle. When on, mixes the microphone signal

with the Master Audio output

When the MUTE button and the MIX button are
pressed, only the microphone signal is transferred to

the output

12 LOCK Button Press and hold to lock/unlock the front panel buttons
13 CV IN RCA Connectors Connect to the composite video sources (IN 1 and IN 2)
14 YC IN 4-pin Connectors Connect to the s-Video sources (IN 1 and IN 2)
15 YC OUT 4-pin Connector Connect to the s-Video acceptor
16 CV OUT RCA Connector Connect to the composite video acceptor
17 COMP/UXGA IN 15-pin HD C onne ctor s Connect to the component video or UXGA sources (IN 1

and IN 2)

When the 15-pin HD connector is used for UXGA

signals, the syncs are on PIN 13 and PIN 14

18 COMP/UXGA OUT 15-pin HD Conn ecto r Connect to the component video or UXGA acceptor
19 VGA/UXGA OUT 15-pin HD Connector Connect to the VGA/UXGA video acceptor
20 VGA/UXGA IN 15-pin HD Connectors Connect to the VGA/UXGA video sour ces (f rom IN 1 to 4)
21 RS-232 Connect or 9-pin D-sub connector connects to PC or Remote Controller
22 VGA/UXGA AUDIO INPUTS 3.5mm Mini

Jack Connectors

Connect to the VGA/UXGA unbalanced stereo audio

sources (from 1 to 4)
23 CV AUDIO IN RCA Connectors Connect to the composite video sources (1 and 2)
24 YC AUDIO IN RCA Connectors Connect to the s-Video unbalanced stereo audio sources

(1 and 2)
25 COMP/UXGA AUDIO IN RCA Connecto rs Connec t to the com ponen t video ster eo audio so urces (1

and 2)
26 MASTER AUDIO OUT RCA Connectors Connect to the stereo audio acceptor

The input selector button last pressed transmits the
audio input signal of the selected channel to the master

audio output

27 MIC IN 6.3mm Phone Jack Connector Connects to the microphone
28 Power Connector with Fuse AC connector enabling power supply to the unit

6 VP-23C - Overview

Figure 2 describes the underside of the VP-23C:

Figure 2: VP-23C Presentation Switcher – Underside View

# Feature Function

1 NORMAL / FLASH

PROGRAM Switch

Select between NORMAL for normal operation (the factory
default), and FLASH PROGRAM to upgrade to the latest
Kramer firmware

2 COND. MIC / DYN.

MIC Switch

Select between a dynamic microphone and a condenser

VP-23C - Installing in a Rack 7

4 Installing in a Rack

Before Installing in a Rack How to Rack Mount

Before in s talling in a rack , b e sure that th e
environment is within the recommended range:

To rack-mount a machine:
1

. Attach both ear brackets to the
machine. T o do so, remove the
screws from each side of the
machine (3 on each side) , and
replace those screws through the
ear brackets.

When i nstalling on a 19" rack, avoid haz ards by
taking care that:

. It is located within the recommended
environmental conditions, as the operating
ambient temperature of a closed or multi unit
rack assembly may exceed the room ambient
temperature.

. Once rack mounted, enough air will still flow
around the machine.

. The machine is placed straight in the correct
horizontal position.

. You do not overload the circuit(s). When
connecting the machine to the supply circuit,
overloading the circuits might have a detrimental
effect on overcurr ent protection and suppl y
wiring. Refer to t he appropriate nameplate
ratings for information. For example, for fuse
replacement, see the value printe d on the
product labe l.

. The machine is earthed (grounded) in a
reliable way and is connected only to an
electricity socket with grounding. Pay particular
attention to situatio n s where elec tricity is
supplied indirectly (when the power cord is not
plugged directly into the socket in the wall), for
example, when usi ng an extensi on cabl e or a
power strip, and that you use only th e power
cord that is supplied with the machine.

1

2

3
4

5

2. Place the ears of the machine
against the r ack r ails, and insert the
proper screws (no t provided)
through each of the four holes in
the rack ears.
Note:

In some models, the front panel

may feature built-in rack ears

Detachable rack ears can be

removed for desktop use

Always mount the machine in the
rack before you at tac h any cables
or connect the machi ne to the
power

If you are using a Kramer rack
adapter kit (for a machine that is
not 19"), see the Rack Adapters
user manual for installation
instructions available from:
http://www.kramerelectronics.com)









CAUTION!

OPERATING TEMPERATURE:
STORAGE TEMPER A TURE :

HUMIDITY:

0º to + 55 º C (3 2º to 13 1º F)

-45º to + 72 ºC (- 4 9º to 16 2º F)
10% to 90%, RHL non-condensing

!

8 VP-23C - Connecting the VP-23C

5 Connecting the VP-23C

Always switch off the power to each device before connecting it to your
VP-23C. After connecting your VP-23C, connect its power and then
switch on the power to each device.

In Figure 3

, the audio input connections are not shown, except for the microphone.
In this example, all the outputs are connected to the same projector. Use the
projector controller to switch between the VP-23C video outputs or the projector
inputs.

To connect the VP-23C, as illustrated in the example in Figure 3

, do the following:

You do not need to connect all the inputs.

1. Connect the following video sources:

Although in this example not all the sources are connected (for example, the s-Video
source), you can connect all of the inputs, that is, 10 in total.

 One composite video source (for example, composite video

player 1) to the CV IN 1 RCA connector

 One composite video source (for example, a composite video

player 2) to the CV IN 2 RCA connector

 One component video source (for example, component video

player 1) to the COMP/UXGA IN 1 15-pin HD connector

When connecting a component video input or output, connect Y to PIN 1, U to
PIN 2 and V to PIN 3 on the 15-pin HD connector.

When the 15-pin HD connector is used for UXGA signals, the syncs are on PIN
13 and PIN 14

 One component video source (for example, a component video player

2) to the COMP/UXGA IN 2 15-pin HD connector

 One VGA/UXGA source (for example, a computer graphics source) to

the VGA/UXGA IN 1 15-pin HD connector

2. Connect the acceptors to a projector as follows:

In this example a projector is used, but you can also connect separate outputs such as
displays, video recorders and so on

 The composite video CV OUT RCA connector to the composite video

input of the projector

i

VP-23C - Connecting the VP-23C 9

 The COMP/UXGA OUT 15-pin HD connector to the component video

input of the projector

When connecting a component video input or output, connect Y to PIN 1, U to
PIN 2 and V to PIN 3 on the 15-pin HD connector.

 The VGA/UXGA OUT 15-pin HD connector to the VGA/UXGA input of

the projector

3. Connect the appropriate unbalanced stereo audio sources (not shown in

Figure 3

).

4. Connect the MASTER AUDIO OUT RCA connectors to an amplifier with
speakers.

5. Connect a dynamic or a condenser microphone, if required, to the MIC IN

6.3 mm phone jack connector.

Use the COND. MIC / DYN. MIC switch (refer to item 2 in Figure 2) to select a dynamic
microphone or a condenser

6. As an option, you can connect a PC and/or controller to the RS-232 port
(see Section

5.1).

7. Connect the power cord (not shown in Figure 3

).

10 VP-23C - Connecting the VP-23C

Figure 3: Connecting the VP-23C Presentation Switcher

5.1 Connecting to the VP-23C via RS-232

You can connect to the unit via a crossed RS-232 connection, using for example,
a PC. A crossed cable or null-modem is required as shown in method A and B
respectively. If a shielded cable is used, connect the shield to pin 5.

Method A (Figure 4

)—Connect the RS-232 9-pin D-sub port on the unit via a
crossed cable (only pin 2 to pin 3, pin 3 to pin 2, and pin 5 to pin 5 need be
connected) to the RS-232 9-pin D-sub port on the PC.
Note: There is no need to connect any other pins.

I4

N

I1

N

out

I1

N

I3

N

I4

N

CV

I

N2

OUT

VGA/UXGAA I

UDIO NPUTS

CVA I

UDIO N

YCA I

UDIO N

C /UXGAA I

OMP UDION

MAO

ASTER UDIO UT

MI

IN N

I4

N

I2

N

I

N1

YC

VGA/UXGA

Computer

Graphics Source

Amplifier

MIC

Composite

Video Player 1

Projector

Audio input

connections

are not shown

Composite

Video Player 2

I1

N

Component

Video Player 1

Component

Video Player 2

RS-232

VGA

VGA

CV

CV

VGA

VGA

CV

Audio

Audio

VP-23C - Connecting the VP-23C 11

Figure 4: Crossed Cable RS-232 Connection

Hardware flow control is not required for this unit. In the rare case where a
controller requires hardware flow control, short pin 1 to 7 and 8, and pin 4 to 6 on
the controller side.

Method B (Figure 5

)—Connect the RS-232 9-pin D-sub port on the unit via a
straight (flat) cable to the null-modem adapter, and connect the null-modem
adapter to the RS-232 9-pin D-sub port on the PC. The straight cable usually
contains all nine wires for a full connection of the D-sub connector. Because the
null-modem adapter (which already includes the flow control jumpering described
in Method A above) only requires pins 2, 3 and 5 to be connected, you are free to
decide whether to connect only these 3 pins or all 9 pins.

Figure 5: Straight Cable RS-232 Connection with a Null Modem Adapter

1

2

6

3

7

4

8

5

9

1

2

6

3

7

4

8

5

9

PC

1

2

6

3

7

4

8

5

9

to PC

Null-Modem

Adapter

12 VP-23C - Operating the VP-23C Presentation Switcher

6 Operating the VP-23C Presentation Switcher

You can operate your VP-23C via:

• The front panel buttons

• RS-232 serial commands transmitted by a touch screen system, PC, or other

serial controller

The front panel buttons include the I NPUT SELECTO R buttons, the M ASTER and MIC
AUDIO LEVEL BUTTONS, and the MUTE, LOCK and MIX button s.

6.1 Operating your Switcher

You can select the video signals within each switcher group by pressing the
relevant INPUT SELECTOR buttons.

You can overlook a switcher group and choose not to select a button from it.

You can switch:

• One of the two composite video VIDEO (CV) inputs to the composite video

output

You cannot select more than one button in a section.

• One of the two s-Video (Y/C) inputs to the s-Video output

• One of the two component video COMP/UXGA inputs to the component

video output

• One of the four VGA/UXGA inputs to the VGA/UXGA output

The selected button in each group is illuminated in red. Pressing an illuminated
button for more than 2 seconds disconnects the output and the button no longer
illuminates.

The VP-23C operates in the audio-follow-video (AFV) mode so that the audio
signal follows the selected input signal in which all operations relate to both the
video and the audio channels.

VP-23C - Operating the VP-23C Presentation Switcher 13

The audio signal is routed to the MASTER AUDIO OUT output, therefore the last
INPUT SELECTOR button selected (from any of the switcher groups) routes the
audio signal of that input to the audio output.

The last selected button is illuminated in purple to indicate the source
of the outputted audio signal

When setting the master audio ga in to it s minimu m, the MUTE button illumin ates.

When both the MUTE and MIX buttons are on, only the microphone signal is
transferred to the master output.

The MUTE and MIX buttons can be turned ON or OFF via RS-232 control and
their respective buttons on the front panel illuminate.

i

14 VP-23C - Technical Specifications

7 Technical Specifications

INPUTS:

2 composite video (1Vpp/75Ω) on RCA connectors
2 s-Video 1 Vpp (Y), 0.3Vpp (C) / 75Ω on 4-pin connectors
2 component video/UXGA on 15-pin HD connectors
4 VGA/UXGA on 15-pin HD connectors
4 unbalanced stereo audio on 3.5mm jack connectors (for

VGA/UXGA): +4dBm/10kΩ
6 unbalanced stereo audio channels: +4dBm / 10kΩ on RCA

connectors (for CV, YC, COMP/UXGA)
Mic: 3mV / 10kΩ condenser with 15V phantom voltage/ dynamic on a

6.3mm phone jack connector

OUTPUTS:

1 composite video (1Vpp/75Ω) on an RCA connector
1 s-Video 1Vpp (Y), 0.3Vpp (C) / 75Ω on a 4-pin connector
1 component video/UXGA on an 15-pin HD connector
1 VGA/UXGA on an 15-pin HD connector
1 unbalanced stereo master audio channel: +4dBm / 50Ω on RCA

connectors

MAX. OUTPUT
LEVEL:

VIDEO: 2.1Vpp AUDIO: 27Vpp

BANDWIDTH
(-3dB):

VIDEO: VGA / UXGA: 400MHz;
s-Video (Y): 310MHz;
Composite/SDI video: 310MHz;

Component video: 380MHz;
HDTV compatible

AUDIO: 40kHz

DIFF. GAIN: <0.07% all channels
DIFF. PHASE: <0.05Deg all channels
S/N RATIO: VIDEO: 75dB all channels AUDIO: 75dB /1 Vpp all

channels

CONTROLS: 10 selector buttons, master audio level, mic audio level, mix, lock,

mute, RS-232
POWER SOURCE: 100-240V AC, 50/60Hz, (115V AC, U.S.A.) 7VA
DIMENSIONS: 19” x 7” x 1U (W, D, H) rack-mountable
WEIGHT: 2.6kg (8lbs) approx
ACCESSORIES: Power cord, null modem adapter, Windows®-based Kramer control

software

Specifications are subject to change without notice at http://www.kramerelectronics.com

VP-23C - Default Communication Parameters 15

8 Default Communication Parameters

RS-232
Protocol 2000

Baud Rate: 9600
Data Bits: 8
Stop Bits: 1
Parity: None
Command Format: HEX
Example (Output 1 to Input 1): 0x01, 0x81, 0x81, 0x81

Ethernet

IP Address: 192.168.1.39
TCP Port Number: 5000
Network Mask: 255.255.255.0
Default Gateway: 192.168.1.1

16 VP-23C - Hex Tables

9 Hex Tables

These tables list the Hex values (which the protocol in Section 10 describes in
more detail) for the VP-23C Presentation Switcher:

Inputs Composite

Video OUT

s-Video OUT Component

Video OUT

VGA/UXGA
OUT

Group #

Composite

Video

In 1 01 81 81 81
In 2 01 82 81 81

s-Video

In 1

01 81 82 81

In 2

01 82 82 81

Component

Video

In 1

01 81 83 81

In 2

01 82 83 81

VGA / UXGA

In 1

01 81 84 81

In 2

01 82 84 81

In 3

01 83 84 81

In 4

01 84 84 81

Master Audio Selector

Composite Video Group 02 81 81 81
s-Video Group 02 82 81 81
Component Video Group 02 83 81 81
VGA / UXGA Group 02 84 81 81
Microphone 02 85 81 81

9.1 Audio Gain Control Hex Tables

The next tables describe the audio gain controls:

When controlling the VP-23C via RS-232, read the note to command 42 in the communication
protocol.

Set Relative Audio Gain of Master

Audio Out Gain

Gain by One
Step

Master Out Microphone

16 81 80 81 Mute

Increase

18 81 80 81 18 82 80 81

…

Decrease

18 82 81 81 18 82 81 81

16 81 D3 81 -6dB

…

16 81 DF 81 0dB

…

16 81 EB 81 6dB

…

16 81 FF 81 16dB

For the microphone gain control,
the second byte equals 82

VP-23C - Kramer Protocol 2000 17

10 Kramer Protocol 2000

The VS-23C is compatible with Kramer’s Protocol 2000 (version 0.48) (below).
This RS-232/RS-485 communication protocol uses four bytes of information as
defined below. For RS-232, a null-modem connection between the machine and
controller is used. The default data rate is 9600 baud, with no parity, 8 data bits
and 1 stop bit.

MSB LSB
1

st

byte DESTINATION INSTRUCTION

0 D N5 N4 N3 N2 N1 N0
7 6 5 4 3 2 1 0

2d byte INPUT

1 I6 I5 I4 I3 I2 I1 I0
7 6 5 4 3 2 1 0

3d byte OUTPUT

1 O6 O5 O4 O3 O2 O1 O0
7 6 5 4 3 2 1 0

4th byte MACHINE NUMBER

1 OVR X M4 M3 M2 M1 M0
7 6 5 4 3 2 1 0

1

st

BYTE: Bit 7 – Defined as 0.

D – “DESTINATION”: 0 - for sending information to the switchers (from the PC);

1 - for sending to the PC (from the switcher).

N5…N0 – “INSTRUCTION”
The function that is to be performed by the switcher(s) is defined by the INSTRUCTION (6 bits). Similarly, if a function is
performed via the machine’s keyboard, then these bits are set with the INSTRUCTION NO., which was performed. The
instruction codes are defined according to the table below (INSTRUCTION NO. is the value to be set for N5…N0).

2

nd

BYTE: Bit 7 – Defined as 1.

I6…I0 – “INPUT”.
When switching (ie. instruction codes 1 and 2), the INPUT (7 bits) is set as the input number which is to be switched.
Similarly, if switching is done via the machine’s front-panel, then these bits are set with the INPUT NUMBER which was
switched. For other operations, these bits are defined according to the table.

3

rd

BYTE: Bit 7 – Defined as 1.

O6…O0 – “OUTPUT”.
When switching (ie. instruction codes 1 and 2), the OUTPUT (7 bits) is set as the output number which is to be switched.
Similarly, if switching is done via the machine’s front-panel, then these bits are set with the OUTPUT NUMBER which
was switched. For other operations, these bits are defined according to the table.

4

th

BYTE: Bit 7 – Defined as 1.

Bit 5 – Don’t care.
OVR – Machine number override.
M4…M0 – MACHINE NUMBER.
Used to address machines in a system via their machine numbers.

When several machines are controlled from a single
serial port, they are usually configured together with each machine having an individual machine number. If the OVR bit
is set, then all machine numbers will accept (implement) the command, and the addressed machine will reply.
For a single machine controlled via the serial port, always set M4…M0 = 1, and make sure that the machine itself is
configured as MACHINE NUMBER = 1.

18 VP-23C - Kramer Protocol 2000

INSTRUCTION DEFINITION F OR S PEC IFIC IN STR UC TION NOTE

# DESCRIPTION INPUT OUTPUT

0 RESET MACHINE 0 0 1
1 SWITCH GROUPS 1-2 1-3* 2

1-4 4*
Set equal to video and audio inputs

to be switched for the relative group

Set equal to group to which
output is to be switched

2 SWITCH AUDIO OUTPUTS TO

MASTER AUDIO OUT

1-4* Set equal to audio output to be
switched to Master Audio out

1 2

5 REQUEST GROUP STATUS 0 1-4 Set equal to the group of

which status is required

3

6 REQUEST STATUS OF

MASTER AUDIO OUTPUT

0 1 3

11 REQUEST BREAKAWAY

SETTING

0 0 3

16 ERROR Don’t care 0 – Invalid instruction

1 – Out of range

4

18 RESET MACHINE 0 0 1
22 SET AUDIO PARAMETER Parameter Value Parameter

Value: 2, 7, 8, 9,

Audio gain: 1 – Audio Master

2 –Microphone

Audio gain: 0-127

Mix microphone: 0 Mix microphone: 0 – mix OFF

1 – Mix ON

24 INCREASE/DECREASE

AUDIO PARAMETER

1 – audio master
2 – microphone

0 - increase output
1 - decrease output

8

25 REQUEST AUDIO

PARAMETER

Equal to input / output number
whose parameter is requested
1 – audio master
2 – microphone

0 9

30 LOCK FRONT PANEL 0 – Panel unlocked

1 – Panel locked

0 2

31 REQUEST WHETHER PANEL

IS LOCKED

0 0 3

42 AUDIO PARAMETER

SETTINGS FOR
INSTRUCTIONS 22, 25

0 0 - Gain

4 - Mix mode

9

57 SET AUTO SAVE 1 – Autosave

2 – No save

5

61 IDENTIFY MACHINE 1 or 2 – Machine name

3 or 4 – Program version

0 – request first 4 digits
1 – request first suffix
10 – request first prefix

6

62 DEFINE MACHINE 1 – Number of inputs

2 – Number of outputs

1 – For video
2 – For audio

3

* 1 – for CV group, 2 – for SV group, 3 – for Comp video group, 4 – for VGA group

NOTE 1

When the master switcher is reset, (e.g. when it is turned on), the reset code is sent to the PC. If this code is sent to the
switchers, it will reset according to the present power-down settings.

NOTE 2

These are bi-directional definitions. That is, if the switcher receives the code, it will perform the instruction; and if the
instruction is performed (due to a keystroke operation on the front panel), then these codes are sent. For example, if:
0000 0001 Instruction “Switch Groups”
1000 0010 Input #2
1000 0001 in composite video group
1000 0001 Machine #1 (master)
Was sent from the PC, then the switcher (machine #1) will switch input 2 in composite video group to its output. If the
user switched input 4 in the VGA group via the front panel keypad, then the switcher will send:
0100 0001
1000 0100
1000 0100
1000 0001 to the PC.
When the PC sends instruction #1 or #2 to the switcher, then, if the instruction is valid, the switcher replies by sending
the same four bytes to the PC that were sent (except for the first byte, where the DESTINATION bit is set high).

VP-23C - Kramer Protocol 2000 19

NOTE 3

The reply to a “REQUEST” instruction is as follows: the same instruction and input codes as were sent are returned, and
the OUTPUT is assigned to the value of the requested parameter. The reply to the instruction #5 (what is the status of
the VGA group?):
0000 0101
1000 0000
1000 0011
1000 0001
Would be:
0100 0101
1000 0000
1000 0100
1000 0001

NOTE 4

An error code is returned to the PC if an invalid code was sent to the switcher (for example, when trying to switch an
input or a group which is greater than the highest one defined). This code is also returned to the PC if an RS-232
instruction is sent while the machine is being programmed via the front panel. Reception of this code by the switcher will
not be valid.

NOTE 5

Under normal conditions, the machine’s present status is saved each time a change is made. The power-down save (the
auto save) may be disabled using this code. Note that each time that the machine is turned ON, the auto save function
is automatically set.

NOTE 6

This is a request to identify the switchers in a system. If the INPUT is set as 1 or 2, the machine will send its name. The
reply is the decimal value of the INPUT and the OUTPUT. For example, the reply to the request to send the machine’s
name (for machine #001) will be:
0111 1101
1000 0000 (i.e. 128+0)
1001 0111 (i.e. 128+23)
1000 0001
If the request for identification is sent with the INPUT set as 3 or 4, the appropriate machine will send its software
version number. Again, the reply would be the decimal value of the INPUT and OUTPUT - the INPUT representing the
number in front of the decimal point, and the OUTPUT representing the number following the decimal point. For
example, for version 3.5 the reply will be:
0111 1101
1000 0011 (i.e. 128+3)
1000 0101 (i.e. 128+5)
1000 0001

NOTE 7

GAIN VALUE – Number from 0 to 127

NOTE 8

Answer = Current Audio Gain (0 –127)
If the Audio Gain = 0, the MUTE button is illuminated

NOTE 9

When changing parameters (mix or gain), further information needed in instructions 22 and 25 is sent using instruction
42 – which is sent prior to the instruction. For example, to request the audio gain value of the master audio output
2A 80 80 81
and then send HEX codes
19 81 80 81.
To set MIX mode, send hex codes

2A 81 84 81
and then send HEX codes
16 80 81 81

20 VP-23C - Kramer Protocol 2000

LIMI TED WARR ANTY

WHO IS PROTECTED?

WHAT IS COVERED AND WHA T IS NOT COVERED

WHAT WE WILL P AY FOR AND WHA T WE WILL NOT P A Y FOR

HOW YOU CAN GET WARRANTY SERVICE

LIMIT A TION OF IMPLIED WA RRANTIE S

EXCLUSION OF DAMAGES

CAUTIO N!

We warrant this product free from defects in material and workmanship under the following terms.

HOW LONG IS THE WARRANTY

Labor and parts are warranted for seven years from the date of the first customer purchase.

Only the first purchase customer may enforce this warranty.

We will pay labor and material expenses for covered items. We will not pay for the following:

The liability of Kramer for any effective products is limited to the repair or replacement of the product at our option. Kramer
shall not be liable for:

This warranty gives you specific legal rights, and you may also have other rights, which vary from place to place.

: All products returned to Kramer for service must have prior approval. This may be obtained from your dealer.

This equipment has been tested to determine compliance with the requirements of:
EN-50081: "Electromagnetic compatibility (EMC);

generic emission standard.
Residential, commercial and light industry"
EN-50082: "Electromagnetic compatibility (EMC) generic immunity standard.

Part 1: Residential, commercial and light industry environment".
CFR-47: FCC* Rules and Regulations:

Part 15: “Radio frequency devices

Subpart B Unintentional radiators”

Except as below, this warranty covers all defects in material or workmanship in this product. The following are not
covered b y the warr anty:

1. An y product which is not distribu ted by us or which is not purchased from an authorized Kramer deale r. If you are

uncertain as to whether a dealer is authorized, pleas e contact Kramer at one of the agen ts listed in the Web site
www.kramerelectronics.com.

2. Any product, on which the serial number has been defaced, modif i ed or removed, or on which the WARRANTY VOID

TAMPERED sticker has been torn,

3. Damage, deterioration or malfunction resulting from:

i) Accident, misuse, abuse, neglect, fire, water, lightning or other acts of nature
ii) Product modification, or failure to follow instructions supplied with the product
iii) Repair or attempted repair by anyone not authorized by Kramer
iv) Any shipment of the product (claims must be presented to the carrier)
v) Removal or installation of the product
vi) Any other cause, which does not relate to a product defect
vii) Cartons, equipment enclosures, cables or accessories used in conjunction with the product

1. Removal or installations charges.

2. Costs of initial technical adjustments (set-up), including adjustment of user controls or programming. These costs are

the responsibility of the Kramer dealer from whom the product was purchased.

3. Shipping charges.

1. To obtain service on you product, you must take or ship it prepaid to any authori zed Kram er service center.

2. Whenever warranty ser vic e is required , the original dated invoice (or a copy) must be presented as proof of

warranty coverage, and should be included i n any shipmen t of the product. Please also include in any mailing a
contact name, company, address, and a description of the problem(s) .

3. For the name of the nearest Kramer autho rized servi ce center, consult your authoriz ed dealer.

All implied warranties, inc ludi ng warranties of merchantability and fitness for a particular purpose, are limited in duration
to the length of this warranty.

1. D amage t o o ther proper t y caused by d efects in this pro duct , dama ges bas ed upon i nconv enience, loss of use of the

product, loss of time, commercial loss; or:

2. Any other damages, whether incidental, cons equen tial or otherwise. Some countries may not allow limita tions on

how long an implied warranty lasts and/or do not allow the exclusion or limitat ion of incident al or conseq uen tial
damages, so the above limitations and exclus ions may not apply to you.

Servicing the machines c an onl y be done by an authorize d Kramer technici an. Any user who makes cha nges or
modifications t o the unit without the expressed approval of the manufacturer w ill void user authority t o oper at e the
equipment.

Use the supplied DC power supply to feed power to the machine.
Please use recommended interconnection cables to connect the machine to other components.

IF reattached, removed or otherwise i nterf e red wit h.

* FCC and CE approved using STP cable (for twisted pair products)

NOTE

Part 1:

For the latest information on our products and a list of Kramer distributors,
visit our Web site where updates to this user manual may be found.

We welcome your questions, comments, and feedback.

Web site: www.kramerelectronics.com

E-mail: [email protected]

!

SAFETY WARNING

Disconnect the unit from the power
supply before opening and servicing