Analog 4-Wire Video Intercom

Foreword

General

This manual mainly introduces structure, installation, wiring and menu operations of the analog 4-wire video intercom. Read carefully before using the device, and keep the manual safe for future reference.

Model

7-inch and 4.3-inch VTH

Safety Instructions

The following categorized signal words with defined meaning might appear in the manual.

Revision History

Privacy Protection Notice

As the device user or data controller, you might collect the personal data of others such as their face, fingerprints, and license plate number. You need to be in compliance with your local privacy protection laws and regulations to protect the legitimate rights and interests of other people by implementing measures which include but are not limited: Providing clear and visible identification to inform people of the existence of the surveillance area and provide required contact information.

About the Manual

• The manual is for reference only. Slight differences might be found between the manual and the product.
• We are not liable for losses incurred due to operating the product in ways that are not in compliance with the manual.
• The manual will be updated according to the latest laws and regulations of related jurisdictions. For detailed information, see the paper user's manual, use our CD-ROM, scan the QR code or visit our official website. The manual is for reference only. Slight differences might be found between the electronic version and the paper version.
• All designs and software are subject to change without prior written notice. Product updates might result in some differences appearing between the actual product and the manual. Please contact customer service for the latest program and supplementary documentation.
• There might be errors in the print or deviations in the description of the functions, operations and technical data. If there is any doubt or dispute, we reserve the right of final explanation.
• Upgrade the reader software or try other mainstream reader software if the manual (in PDF format) cannot be opened.
• All trademarks, registered trademarks and company names in the manual are properties of their respective owners.
• Please visit our website, contact the supplier or customer service if any problems occur while using the device.
• If there is any uncertainty or controversy, we reserve the right of final explanation.

Important Safeguards and Warnings

This section introduces content covering the proper handling of the device, hazard prevention, and prevention of property damage. Read carefully before using the device, comply with the guidelines when using it.

Operation Requirements

• Check whether the power supply is correct before use.
• Do not unplug the power cord on the side of the device while the adapter is powered on.
• Operate the device within the rated range of power input and output.
• Transport, use and store the device under allowed humidity and temperature conditions.
• Do not drop or splash liquid onto the device, and make sure that there is no object filled with liquid on the device to prevent liquid from flowing into it.
• Do not disassemble the device without professional instruction.

Installation Requirements

• ⚡ WARNING Do not connect the power adapter to the device while the adapter is powered on.
• Strictly comply with the local electric safety code and standards. Make sure the ambient voltage is stable and meets the power supply requirements of the device.
• Do not connect the device to two or more kinds of power supplies, to avoid damage to the device.
• Improper use of the battery might result in a fire or explosion.
• Personnel working at heights must take all necessary measures to ensure personal safety including wearing a helmet and safety belts.
• Do not place the device in a place exposed to sunlight or near heat sources.
• Keep the device away from dampness, dust, and soot.
• Install the device on a stable surface to prevent it from falling.
• Install the device in a well-ventilated place, and do not block its ventilation.
• Use an adapter or cabinet power supply provided by the manufacturer.
• Use the power cords that are recommended for the region and conform to the rated power specifications.
• The power supply must conform to the requirements of ES1 in IEC 62368-1 standard and be no higher than PS2. Please note that the power supply requirements are subject to the device label.
• The device is a class I electrical appliance. Make sure that the power supply of the device is connected to a power socket with protective earthing.

1 Structure

1.1 Introduction

The analog 4-wire video intercom consists of a door station ("VTO") and an indoor monitor ("VTH"). It is applicable to buildings, such as residential buildings, for people to do voice and video calls. The VTO is installed outdoors and VTH is installed indoors.

1.2 Features

VTH

• Real-time video/voice communication
• Can be connected to three VTOs
• Can be connected to cameras (CVBS)
• Plug-and-play

VTO

• Real-time voice communication
• Self-adaptive IR illumination

1.3 Front Panel

1.3.1 7-inch VTH

Figure 1-1 Front panel shows the layout of the 7-inch VTH. It includes numbered components such as microphone, buttons for call/hang-up/snapshot, screen, power indicator, and speaker.

1.3.2 4.3-inch VTH

Figure 1-2 Front panel shows the layout of the 4.3-inch VTH. It includes numbered buttons for various functions.

Table 1-1 Front panel description

1.4 Rear Panel

There might be slight differences in the real panel among different models. But they have the same function ports.

Figure 1-3 Rear panel shows the rear view with numbered ports for analog camera, VTO, power input, and cascading connections. It also indicates the VTO hanging slot.

Table 1-2 Rear panel

2 Installation

• Do not install devices in harsh environment with condensation, high temperature, dust, corrosive substance and direct sunlight.
• In case of abnormality after powering on the device, cut off the power supply at once, and unplug the network cable. Power on after troubleshooting.
• Installation should be done by professional teams. Do not dismantle or repair the device by yourself in case of device failure. Contact after-sales service if you need any help.
• The recommended installation height of the device is 1.6 m from the ground.

Figure 2-1 Installation height illustrates the recommended installation height of 1.6 meters from the ground, with a 0.5-meter distance indicated.

2.1 VTH

Fix the bracket on the wall by screws, hang the VTH on the bracket, and then apply silicone sealant to the gap between the device and the wall.

Figure 2-2 VTH installation shows the process of mounting the VTH unit.

2.2 VTO

Install the VTO bracket on the wall, and then hang the VTO on the bracket; or install the VTO cover on the wall, and then hang the VTO on the cover. Finally, apply silicone sealant to the gap between the device and the wall.

Figure 2-3 VTO installation illustrates the mounting of the VTO unit.

Figure 2-4 Apply silicone sealant to the gap between the device and the wall shows how to apply sealant for weatherproofing.

3 Wiring

At most 2 VTOs and 3 VTHs can be wired in one communication system.

3.1 Preparations

3.1.1 Port Connection Rules

Figure 3-1 Port connection rules illustrates the connectivity between ports A, B, C, and D on VTH units for data communication.

• Port A of an VTH can be connected to Port C of another VTH to do data communication.
• Port B of an VTH can be connected to Port D of another VTH to do data communication.
• Port A of an VTH cannot be connected to Port B or D of another VTH to do data communication.
• Port C of an VTH cannot be connected to Port B or D of another VTH to do data communication.

3.1.2 Cord Specification

Depending on the distance between the VTO and VTH, you need to select RVV4 cords of different specifications.

Table 3-1 Cord specification

If the distance between the VTO and VTH is more than 50 m, use coaxial cables.

• Do not pull the cords violently.
• During wiring, wrap the cord joints with insulated rubber tape to prevent short circuit.

3.2 Wiring One VTO and One VTH

Figure 3-2 Wiring (1) shows the wiring configuration for connecting one VTO and one VTH, including connections to an analog camera, electric lock, and exit button. It details the wire color coding for power, video, audio, ground, and exit button functions.

3.3 Wiring Three VTOs and One VTH

Figure 3-3 Wiring (2) illustrates the wiring setup for connecting three VTOs and one VTH, along with analog cameras, electric locks, and exit buttons, detailing the connections and wire color codes.

3.4 Wiring Two VTOs and Three VTHs

Figure 3-4 Wiring (3) depicts the wiring configuration for connecting two VTOs and three VTHs, including connections to analog cameras, electric locks, and exit buttons. It also mentions that recommended analog cameras (CVBS) are HAC 1230 series.

4 Menu Operations

You can configure the functions of the VTH, such as volume, brightness, and more.

• Only VTH1020J-T supports the Snapshots and Time functions.
• All configurations will be saved after you exit the menu.

Table 4-1 Menu operations

4.1 Snapshots

You can take snapshots during monitoring, and view the snapshots you have taken.

The VTH can store up to 200 snapshots. If storage is full, the earlier ones will be overwritten.

Taking Snapshots

• During monitoring.

Step 1: Press [Monitoring Button] to go to the monitoring image that you want.

Step 2: Press [Snapshot Button], and then "Successful" will appear on the screen.

When a VTO is calling or in a call with a VTO, press [Call/Voice Button], and then "Successful" will appear on the screen.

If the calling lasts more than 1 second, a snapshot will be automatically taken.

Viewing Snapshots

Step 1: Press [Menu Button] to bring up the menu.

Step 2: Press [Select Button], select Snapshots, and then press [Confirm Button].

Figure 4-2 List of snapshots shows a list of captured snapshots with filenames and timestamps.

Step 3: Press [Select Button] to select the one that you need, and then press [Confirm Button].

To delete a snapshot, press [Delete Button]. "Detele?" will appear on the screen, and then press [Confirm Button] to confirm.

4.2 Time

Step 1: Press [Menu Button] to bring up the menu.

Step 2: Press [Select Button] to select the part of the time that you want.

Step 3: Press [Adjust Button] or [Adjust Up Button] to adjust the number.

4.3 Restoring to Default Settings

Step 1: Press [Menu Button] to bring up the menu.

Step 2: Press [Select Button] to select FactoryReset.

Step 3: Press [Confirm Button], and then the device will restart.

Figure 4-4 Confirm your operation shows the confirmation screen for actions like factory reset.

Appendix 1 Cybersecurity Recommendations

Mandatory actions to be taken for basic device network security:

1. Use Strong Passwords
   Please refer to the following suggestions to set passwords:
   
   • The length should not be less than 8 characters;
   • Include at least two types of characters; character types include upper and lower case letters, numbers and symbols;
   • Do not contain the account name or the account name in reverse order;
   • Do not use continuous characters, such as 123, abc, etc.;
   • Do not use overlapped characters, such as 111, aaa, etc.;
2. Update Firmware and Client Software in Time
   According to the standard procedure in Tech-industry, we recommend to keep your device (such as NVR, DVR, IP camera, etc.) firmware up-to-date to ensure the system is equipped with the latest security patches and fixes. When the device is connected to the public network, it is recommended to enable the "auto-check for updates" function to obtain timely information of firmware updates released by the manufacturer.
   We suggest that you download and use the latest version of client software.

"Nice to have" recommendations to improve your device network security:

1. Physical Protection
   We suggest that you perform physical protection to device, especially storage devices. For example, place the device in a special computer room and cabinet, and implement well-done access control permission and key management to prevent unauthorized personnel from carrying out physical contacts such as damaging hardware, unauthorized connection of removable device (such as USB flash disk, serial port), etc.
2. Change Passwords Regularly
   We suggest that you change passwords regularly to reduce the risk of being guessed or cracked.
3. Set and Update Passwords Reset Information Timely
   The device supports password reset function. Please set up related information for password reset in time, including the end user's mailbox and password protection questions. If the information changes, please modify it in time. When setting password protection questions, it is suggested not to use those that can be easily guessed.
4. Enable Account Lock
   The account lock feature is enabled by default, and we recommend you to keep it on to guarantee the account security. If an attacker attempts to log in with the wrong password several times, the corresponding account and the source IP address will be locked.
5. Change Default HTTP and Other Service Ports
   We suggest you to change default HTTP and other service ports into any set of numbers between 1024~65535, reducing the risk of outsiders being able to guess which ports you are using.
6. Enable HTTPS
   We suggest you to enable HTTPS, so that you visit Web service through a secure communication channel.
7. MAC Address Binding
   We recommend you to bind the IP and MAC address of the gateway to the device, thus reducing the risk of ARP spoofing.
8. Assign Accounts and Privileges Reasonably
   According to business and management requirements, reasonably add users and assign a minimum set of permissions to them.
9. Disable Unnecessary Services and Choose Secure Modes
   If not needed, it is recommended to turn off some services such as SNMP, SMTP, UPnP, etc., to reduce risks.
   If necessary, it is highly recommended that you use safe modes, including but not limited to the following services:
   
   • SNMP: Choose SNMP v3, and set up strong encryption passwords and authentication passwords.
   • SMTP: Choose TLS to access mailbox server.
   • FTP: Choose SFTP, and set up strong passwords.
   • AP hotspot: Choose WPA2-PSK encryption mode, and set up strong passwords.
10. Audio and Video Encrypted Transmission
    If your audio and video data contents are very important or sensitive, we recommend that you use encrypted transmission function, to reduce the risk of audio and video data being stolen during transmission.
    Reminder: encrypted transmission will cause some loss in transmission efficiency.
11. Secure Auditing
    
    • Check online users: we suggest that you check online users regularly to see if the device is logged in without authorization.
    • Check device log: By viewing the logs, you can know the IP addresses that were used to log in to your devices and their key operations.
12. Network Log
    Due to the limited storage capacity of the device, the stored log is limited. If you need to save the log for a long time, it is recommended that you enable the network log function to ensure that the critical logs are synchronized to the network log server for tracing.
13. Construct a Safe Network Environment
    In order to better ensure the safety of device and reduce potential cyber risks, we recommend:
    
    • Disable the port mapping function of the router to avoid direct access to the intranet devices from external network.
    • The network should be partitioned and isolated according to the actual network needs. If there are no communication requirements between two sub networks, it is suggested to use VLAN, network GAP and other technologies to partition the network, so as to achieve the network isolation effect.
    • Establish the 802.1x access authentication system to reduce the risk of unauthorized access to private networks.
    • Enable IP/MAC address filtering function to limit the range of hosts allowed to access the device.