HIK VISION DS-KB2421-IM User manual

Video Door Phone
Door Station and Indoor Station
User Manual
UD05714B

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User Manual
© 2017 Hangzhou Hikvision Digital Technology Co., Ltd.
This user manual is intended for users of the models below:
Series
Model
Door Station
DS-KB2421-IM
Indoor Station
DS-KH2220
It includes instructions on how to use the Product. The software embodied in the
Product is governed by the user license agreement covering that Product.
About this Manual
This Manual is subject to domestic and international copyright protection. Hangzhou
Hikvision Digital Technology Co., Ltd. (“Hikvision”) reserves all rights to this manual. This
manual cannot be reproduced, changed, translated, or distributed, partially or wholly, by
any means, without the prior written permission of Hikvision.
Trademarks
and other Hikvision marks are the property of Hikvision and are
registered trademarks or the subject of applications for the same by Hikvision and/or its
affiliates. Other trademarks mentioned in this manual are the properties of their
respective owners. No right of license is given to use such trademarks without express
permission.
Disclaimer
TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, HIKVISION MAKES NO WARRANTIES,
EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, REGARDING THIS MANUAL.
HIKVISION DOES NOT WARRANT, GUARANTEE, OR MAKE ANY REPRESENTATIONS REGARDING THE
USE OF THE MANUAL, OR THE CORRECTNESS, ACCURACY, OR RELIABILITY OF INFORMATION
CONTAINED HEREIN. YOUR USE OF THIS MANUAL AND ANY RELIANCE ON THIS MANUAL SHALL BE
WHOLLY AT YOUR OWN RISK AND RESPONSIBILITY.
TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, IN NO EVENT WILL HIKVISION, ITS
DIRECTORS, OFFICERS, EMPLOYEES, OR AGENTS BE LIABLE TO YOU FOR ANY SPECIAL,
CONSEQUENTIAL, INCIDENTAL, OR INDIRECT DAMAGES, INCLUDING, AMONG OTHERS, DAMAGES
FOR LOSS OF BUSINESS PROFITS, BUSINESS INTERRUPTION, SECURITY BREACHES, OR LOSS OF DATA
OR DOCUMENTATION, IN CONNECTION WITH THE USE OF OR RELIANCE ON THIS MANUAL, EVEN IF
HIKVISION HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
SOME JURISDICTIONS DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY OR CERTAIN
DAMAGES, SO SOME OR ALL OF THE ABOVE EXCLUSIONS OR LIMITATIONS MAY NOT APPLY TO YOU.
Support
Should you have any questions, please do not hesitate to contact your local dealer.

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Regulatory Information
FCC Information
Please take attention that changes or modification not expressly approved by the party
responsible for compliance could void the user’s authority to operate the equipment.
FCC compliance: This equipment has been tested and 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.
FCC Conditions
This device complies with part 15 of the FCC Rules. Operation is subject to the following
two conditions:
1. This device may not cause harmful interference.
2. This device must accept any interference received, including interference that may
cause undesired operation.
EU Conformity Statement
This product and - if applicable - the supplied accessories too are
marked with "CE" and comply therefore with the applicable
harmonized European standards listed under the EMC Directive
2014/30/EU, the RoHS Directive 2011/65/EU.
2012/19/EU (WEEE directive): Products marked with this symbol cannot
be disposed of as unsorted municipal waste in the European Union. For
proper recycling, return this product to your local supplier upon the
purchase of equivalent new equipment, or dispose of it at designated
collection points. For more information see: www.recyclethis.info
2006/66/EC (battery directive): This product contains a battery that
cannot be disposed of as unsorted municipal waste in the European
Union. See the product documentation for specific battery information.
The battery is marked with this symbol, which may include lettering to
indicate cadmium (Cd), lead (Pb), or mercury (Hg). For proper recycling,
return the battery to your supplier or to a designated collection point.
For more information see: www.recyclethis.info
Industry Canada ICES-003 Compliance
This device meets the CAN ICES-3 (A)/NMB-3(A) standards requirements.

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Symbol Conventions
The symbols that may be found in this document are defined as follows.
Symbol
Description
NOTE
Provides additional information to emphasize or
supplement important points of the main text.
CAUTION
Indicates a potentially hazardous situation, which
if not avoided, could result in equipment damage,
data loss, performance degradation, or
unexpected results.
DANGER
Indicates a hazard with a high level of risk, which
if not avoided, will result in death or serious
injury.
Safety Instruction
All the electronic operation should be strictly compliance with the electrical safety
regulations, fire prevention regulations and other related regulations in your local
region.
Please use the power adapter, which is provided by normal company. The power
consumption cannot be less than the required value.
Do not connect several devices to one power adapter as adapter overload may cause
over-heat or fire hazard.
Please make sure that the power has been disconnected before you wire, install or
dismantle the device.
When the product is installed on wall or ceiling, the device shall be firmly fixed.
If smoke, odors or noise rise from the device, turn off the power at once and unplug
the power cable, and then please contact the service center.
If the product does not work properly, please contact your dealer or the nearest
service center. Never attempt to disassemble the device yourself. (We shall not
assume any responsibility for problems caused by unauthorized repair or
maintenance.)
Do not drop the device or subject it to physical shock, and do not expose it to high
electromagnetism radiation. Avoid the equipment installation on vibrations surface or
places subject to shock (ignorance can cause equipment damage).
Do not place the device in extremely hot (refer to the specification of the device for
the detailed operating temperature), cold, dusty or damp locations, and do not
expose it to high electromagnetic radiation.
The device cover for indoor use shall be kept from rain and moisture.
Exposing the equipment to direct sun light, low ventilation or heat source such as
heater or radiator is forbidden (ignorance can cause fire danger).
Do not aim the device at the sun or extra bright places. A blooming or smear may
occur otherwise (which is not a malfunction however), and affecting the endurance of
sensor at the same time.

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Preventive and Cautionary Tips
Please use the provided glove when open up the device cover, avoid direct contact
with the device cover, because the acidic sweat of the fingers may erode the surface
coating of the device cover.
Please use a soft and dry cloth when clean inside and outside surfaces of the device
cover, do not use alkaline detergents.
Please keep all wrappers after unpack them for future use. In case of any failure
occurred, you need to return the device to the factory with the original wrapper.
Transportation without the original wrapper may result in damage on the device and
lead to additional costs.
Do not expose the device to the explosive situation.
Do not expose the device to the corrosive gas. Otherwise the equipment damage may
occur.
Please wire the power cable according to the instruction as wrong wiring may cause
equipment damage.
Do not allow the child to push the device from the bottom just in case the device
drops and hits the child.
Do not splash the water on the device. Device short circuit or other damages may
occur if the water enters into the device.
Do not expose the device to the sun bright for a long time, otherwise the screen of
the device may fall off.
Please watch out for the glass fragments if the device drops. Avoid scratched or
damaged by the glass fragments and do not allow the child to touch the glass
fragments.
It is suggested that you should smear the glass glue around the device after
installation.
Please make sure no child stands under the device when installing the device. The
device may hit the child in case the device drops in the installation process.
Do not expose the device to high electromagnetism radiation.

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Table of Contents
1 Introduction .................................................................................................1
1.1 Overview.............................................................................................................1
1.2 Features ..............................................................................................................1
2 Appearance Description ...............................................................................2
2.1 Indoor Station .....................................................................................................2
2.2 Door Station........................................................................................................2
3 Terminals and Wirings..................................................................................3
3.1 Terminals and Interfaces ......................................................................................3
3.1.1 Terminals of Indoor Station............................................................................3
3.1.2 Terminals of Door Station ..............................................................................3
3.2 Wiring Description...............................................................................................4
3.2.1 Wiring 1 (1 Door Station and 1 Indoor Station)...............................................6
3.2.2 Wiring 2 (1 Door Station and 3 Indoor Stations) .............................................7
3.2.3 Wiring 3 (2 Door Stations and 3 Indoor Stations)............................................8
4 Installation ................................................................................................... 9
4.1 Indoor Station Installation....................................................................................9
4.2 Door Station Installation ....................................................................................10
5 Local Operation .......................................................................................... 12
5.1 Door Station Local Operation .............................................................................12
5.2 Indoor Station Local Operation...........................................................................12
Appendix....................................................................................................... 13
Installation Notice ...................................................................................................13

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1Introduction
1.1 Overview
The video door phone is composed of
a four-wire indoor station and a
four-wire door station. Featuring in
the convenient installation and easy
operation, it is mainly applied in the
buildings for improving the living
security.
1.2 Features
Indoor Station Features
Hands-free video intercom communication
Supports three indoor stations simultaneously in the intercom system
Supports monitoring the door station and the external analog camera
Remote unlocking
Convenient installation and easy operation
Door Station Features
Hands-free video intercom communication
Supports two door stations simultaneously in the intercom system
Self-adaptive IR supplement (with photoresistor)
One-touch calling
Pinhole camera with 720 x 576 @ 25 fps
Unlock controlling
Anti-oxidant aluminium alloy
Convenient installation and easy operation

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2Appearance Description
2.1 Indoor Station
Figure 2-1 Indoor Station Appearance
Table 2-1 Components Description
No.
Description
1
Power Supply Indicator
2
Call Accept/Decline Key
3
Unlock Key
4
Live View Key
5
Switch Key
6
LCD Screen
7
Microphone
8
Terminals and Interfaces
9
Loudspeaker
10
Volume Control Knob
2.2 Door Station
Figure 2-2 Door Station Appearance
Table 2-2 Components Description
No.
Description
1
Microphone
2
Built-in Camera
3
IR Supplement Lights
4
Photoresistor
5
Call Button
6
Loudspeaker

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3Terminals and Wirings
3.1 Terminals and Interfaces
3.1.1 Terminals of Indoor Station
On the rear panel of the indoor station, there are 4 groups of four-wire terminals for
connecting indoor station or door station, 1 terminal for accessing the camera, and 1
terminal for power supply.
Figure 3-1 Terminals of Indoor Station
Table 3-1 Descriptions of Terminals (Indoor Station)
Name
No.
Interface
Description
Camera
1
CAM
Analog Camera Access
Power Supply
2
12 VDC
12 VDC Power Supply Input
Four-Wire
Interface
A1/B1/C1/D1
B1+/B2+
Power Supply for Door Station
A2/B2/C2/D2
V1/V2
Video Input
A3/B3/C3/D3
A1/A2
Audio Input/Output
A4/B4/C4/D4
G
Grounding Signal
3.1.2 Terminals of Door Station
On the rear panel of the door station, there are 2 wire groups. 1 wire group is used to
connect the indoor station, and another wire group is used to connect the lock.

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Figure 3-2 Wire of Door Station
Table 3-2 Descriptions of Terminals and Interfaces (Door Station)
Name
No.
Color
Interface
Description
Wire
Group
(Four-Wir
e)
E1
Red
5V
Power Supply (from Indoor Station)
E2
Blue
CVBS
Video Output
E3
Yellow
AUIDO
Audio Input/Output
E4
Black
GND
Grounding Signal
Wire
Group
(Lock)
F1
Red
NO
Door Lock Relay Output/Normally Open
F2
Blue
COM
Door Lock Relay Output/Common
F3
Yellow
NC
Door Lock Relay Output/Normally Closed
3.2 Wiring Description
Purpose:
The four-wire indoor station and the four-wire door station are 2 basic but major
components in a four-wire video intercom system. As for extended components, the
analog camera and the electric bolt can be connected to the indoor station and the door
station respectively in a four-wire video intercom system.
Up to 2 door stations are supported simultaneously in the intercom system.
Up to 3 indoor stations are supported simultaneously in the intercom system.
Here take 3 wirings as example.

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NOTE
According to different transmission distances among door stations and indoor
stations, different RVV4 cable specifications are demanded.
Transmission Distance (TD)
RVV4 Cable Specification
TD ≤10 m
RVV4 * 0.2 mm ^2
10 m < TD ≤30 m
RVV4 * 0.5 mm ^2
30 m < TD ≤50 m
RVV4 * 0.75 mm ^2
50 m < TD ≤100 m
RVV4 * 1.5 mm ^2
On the rear panel of the indoor station,
four-wire interface A and four-wire
interface C compose a cascading group;
and four-wire interface B and four-wire
interface C compose a cascading group.
The communication between A and B/D
cannot be realized.
The communication between C and B/D
cannot be realized.
CAUTION
Do not connect the power wire of the four-core cable to the V pin (video wire) or A pin
(audio wire) of the four-wire interface.

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3.2.1 Wiring 1 (1 Door Station and 1 Indoor Station)
CAUTION
Do not pull power cables on the rear panel of the door station hard to avoid the
disconnection of power cables.
Use the insulated tape to tape the bare wires, so as to avoid the short circuit.
Indoor Station
Analog Camera Electric Bolt
Door Station
Red —— NO
Blue —— COM
Yellow —— NC
Red —— Wire for power supply
Blue —— Wire for video output
Yellow —— Wire for audio input/output
Black —— Wire for grounding
B+ —— Wire for power supply
V —— Wire for video input
A —— Wire for audio input
G —— Wire for grounding
Figure 3-3 Wiring 1 (1 Door Station and 1 Indoor Station)

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3.2.2 Wiring 2 (1 Door Station and 3 Indoor Stations)
CAUTION
Do not pull power cables on the rear panel of the door station hard to avoid the
disconnection of power cables.
Use the insulated tape to tape the bare wires, so as to avoid the short circuit.
Indoor
Station 1 B+ —— Wire for power supply
V —— Wire for video input
A —— Wire for audio input
G —— Wire for grounding
Analog Camera 1
Indoor
Station 2
Analog Camera 2
Indoor
Station 3
Analog Camera 3
Door
Station
Electric Bolt
Red —— Wire for power supply
Blue —— Wire for video output
Yellow —— Wire for audio input/output
Black —— Wire for grounding
Red —— NO
Blue —— COM
Yellow —— NC
Figure 3-4 Wiring 2 (1 Door Station and 3 Indoor Stations)

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3.2.3 Wiring 3 (2 Door Stations and 3 Indoor Stations)
CAUTION
Do not pull power cables on the rear panel of the door station hard to avoid the
disconnection of power cables.
Use the insulated tape to tape the bare wires, so as to avoid the short circuit.
Indoor
Station 1
Analog Camera 1
Indoor
Station 2
Analog Camera 2
B+ —— Wire for power supply
V —— Wire for video input
A —— Wire for audio input
G —— Wire for grounding
Indoor
Station 3
Analog Camera 3
Door Station 2
Electric Bolt
Red —— Wire for power supply
Blue —— Wire for video output
Yellow —— Wire for audio input/output
Black —— Wire for grounding
Red —— NO
Blue —— COM
Yellow —— NC
Door Station 1
Electric Bolt
Red —— NO
Blue —— COM
Yellow —— NC
Figure 3-5 Wiring 3 (2 Door Stations and 3 Indoor Stations)

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4Installation
Before you start:
Make sure the device in the package is in good condition and all the assembly parts
are included.
The power supply the indoor station supports is 12 VDC. Please make sure your
power supply matches your indoor station.
Make sure all the related equipment is power-off during the installation.
Check the specification of the product for the installation environment.
4.1 Indoor Station Installation
The indoor station supports the wall mounting, including the wall mounting with the
junction box, and the wall mounting without the junction box.
For the wall mounting with junction box, the wall mounting plate and the junction box
are required. And for the wall mounting without junction box, only the wall mounting
plate is required.
(Optional) The dimension of the junction box is 75 mm (width) x 75 mm (length) x 50
mm (depth).
The dimension of the wall mounting plate is shown in Figure 4-1.
Wall Mounting Plate (Indoor Station)
127 mm
102 mm
60 mm
33 mm
46.4 mm
100 mm
2 mm
Figure 4-1 Wall Mounting Plate
Wall Mounting (Indoor Station)
You can follow the following steps to install the indoor station.
Here we take the wall mounting with the junction box as example.
Steps:
1. Insert the junction box to the hole chiseled on the wall.
2. Fix the wall mounting plate to the junction box with 2 screws.

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Screws
Wall Mounting Plate
Junction
Box
Figure 4-2 Installing the Plate
3. Hook the indoor station to the wall mounting plate tightly by inserting the plate hooks
into the slots on the rear panel of the indoor station, during which the lock catch will
be locked automatically.
Hooks
Slot Slot
Lock Catch
Figure 4-3 Hooking the Indoor Station to the Plate
NOTE
For the installation without the junction box, you should fix the wall mounting plate to
the wall with 2 expansion screws first, and then hook the indoor station.
4.2 Door Station Installation
Accessoris (Door Station)
To install the door station, the wall mounting shield and the wall mounting plate are
required.

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Wall Mounting (Door Station)
You can follow the following steps to install the door station.
Steps:
Figure 4-4 Install the Door Station
1. Fix the wall mounting plate to the wall with 2 screws.
2. Hook the door station to the shield tightly by inserting the hooks of shield panel into
the slots on the rear panel of the door station.
3. Secure the door station with the mounting shield with the set screw.
4. Use 3 screws to secure the wall mounting shield with the door station.
Figure 4-5 Secure Wall Mounting Shield

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5Local Operation
5.1 Door Station Local Operation
Figure 5-1 Call Button of Door Station
Steps:
Press the call button to call the
resident.
NOTE
When press the call button to
call the resident, the maximum
ring duration of the indoor
station is 30s.
5.2 Indoor Station Local Operation
Table 5-1 Indoor Station Local Operation Description
Keys
Description
Accept or decline the incoming call.
Unlock the door.
Open or close the live view.
Switch the live view among the first door station, the second door station,
and the analog camera.
Counterclockwise rotation
Increase the volume.
Clockwise rotation
Decrease the volume.
NOTE
The maximum live view duration is 60s; and the maximum speaking duration is 60s.
During the ring duration, speaking duration, or live view duration, the resident can
unlock the door. The unlocking status can maintain 5 seconds after pressing the
Unlock key.
To achieve the optimal pickup effect, the recommended distance range between the
speaker and the microphone of the indoor station or the door station is 30 to 40 cm.

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Appendix
Installation Notice
While installing the indoor station, make sure that the distance between any two
devices is far enough to avoid the howling and echo. The distance between two devices
is recommended to be longer than 10 meters.
NOTE
Here devices refer to indoor stations, and door stations.
0100001070504

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