Sollae Systems ezTCP CSE-H55N2 Industrial RS-422/RS-485 to Ethernet Converter

Professional-Grade Multi-Drop Serial Networking with IPv4/IPv6 Dual Stack Support: Transform your RS-422/RS-485 serial networks into IP-enabled infrastructure with industrial-grade reliability and advanced IPv4 and IPv6 support.

The Sollae Systems CSE-H55N2 is an industrial-grade RS-422/RS-485 to Ethernet converter designed for demanding multi-drop serial networks. With support for both IPv4 and IPv6, extreme temperature range (-40°C to +85°C), and advanced features like SSL/TLS security and multiple simultaneous connections, the CSE-H55N2 delivers enterprise-level performance for mission-critical industrial automation, SCADA, and building management systems.

Why Choose the CSE-H55N2?

🔄 RS-422/RS-485 Versatility

Support for both RS-422 (full-duplex, point-to-point or multi-drop) and RS-485 (half-duplex, multi-drop up to 32 devices). One converter handles all your long-distance serial networking needs up to 4,000 feet.

🌐 Future-Proof IPv6 Support

Full IPv4/IPv6 dual stack implementation with stateless and stateful (DHCPv6) address auto-configuration. Ready for modern networks and future IPv6 deployments with ICMPv6, TCPv6, and UDPv6 support.

🏭 Industrial-Grade Reliability

Extreme temperature range (-40°C to +85°C) and enhanced noise immunity make this converter perfect for harsh industrial environments. Upgraded from CSE-H55N with improved stability against electrical damage and noise on RS-422/485 lines.

🔒 Enterprise Security

Built-in SSL/TLS encryption, IP/MAC filtering, and password protection ensure your serial data remains secure across the network. Perfect for sensitive industrial control applications.

🔄 Multiple Connection Support

Monitor and control from multiple locations simultaneously. Multiple clients can connect to a single CSE-H55N2 for distributed monitoring and control applications (firmware v2.3A or later).

⚡ High-Speed Performance

RS-422/RS-485 support up to 230.4 kbps ensures fast, reliable data transfer for even the most demanding serial applications. Long-distance capability up to 4,000 feet (1,200m).

🛡️ Enhanced Protection

Embedded 3.9kΩ biasing resistors and TVS (Transient Voltage Suppression) protection on all serial lines. Over-current, reverse voltage, and surge protection on power input.

🎯 Flexible Configuration

Configure via Ethernet (ezManager), serial port, AT commands, or Telnet. Choose the method that works best for your deployment scenario. Mobile apps available for iOS and Android.

CSE-H55N2 Technical Specifications

Serial Interface

Physical Interface:

• Type: RS-422 or RS-485 (software selectable)
• Connector: 6-pin Terminal Block (3.5mm pitch)
• Protection: Embedded 3.9kΩ biasing resistors and TVS on all lines
• Maximum Distance: 4,000 feet (1,200m)

RS-422 Configuration:

• Signals: TX+, TX-, RX+, RX-, GND (2x)
• Mode: Full-duplex
• Topology: Point-to-point or multi-drop (1:N)
• Pin Assignment:
  • Pin 1: TX+ (Transmit Data +)
  • Pin 2: TX- (Transmit Data -)
  • Pin 3: GND (Ground)
  • Pin 4: RX+ (Receive Data +)
  • Pin 5: RX- (Receive Data -)
  • Pin 6: GND (Ground)

RS-485 Configuration:

• Signals: TRX+, TRX-, GND (2x)
• Mode: Half-duplex
• Topology: Multi-drop (up to 32 devices)
• Pin Assignment:
  • Pin 1: TRX+ (Transmit/Receive Data +)
  • Pin 2: TRX- (Transmit/Receive Data -)
  • Pin 3: GND (Ground)
  • Pin 6: GND (Ground)

Serial Parameters:

• Maximum Baud Rate: 230.4 kbps
• Supported Baud Rates: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 230400 bps
• Data Bits: 8 bits, 7 bits (with parity)
• Parity: None, Even, Odd, Mark, Space
• Stop Bits: 1, 1.5, 2
• Flow Control: None, RTS/CTS

Note: When Data Bits is set to 7, NONE parity cannot be used.

Network Interface

Ethernet:

• Port: 1 x RJ-45 (10/100 Mbps)
• Speed: 10Base-T or 100Base-TX (Auto-Sensing)
• Cable Detection: Auto MDI/MDIX (works with straight or crossover cables)
• Connector LEDs:
  • Green: Link status (On = connected, Blink = data activity)
  • Yellow: Speed indicator (Off = 10Mbps, On = 100Mbps)

Network Protocols:

• IPv4: TCP, UDP, IP, ICMP, ARP, DHCP, PPPoE, DNS, DDNS, Telnet
• IPv6: ICMPv6, TCPv6, UDPv6, IPv6 fragmentation
• IPv6 Configuration: Stateless and Stateful (DHCPv6) auto-configuration
• Security: SSL/TLS (Secure Socket Layer)
• Management: Telnet, HTTP (ezManager)
• Advanced: Telnet COM Port Control Option (RFC 2217)

Communication Modes

TCP Server (T2S):

• Passive connection mode
• Waits for incoming TCP client connections
• Default local port: 1470
• Ideal for centralized monitoring applications

TCP Client (COD):

• Active connection mode
• Initiates connection to remote TCP server
• Configurable peer IP address and port
• Perfect for data logging and cloud integration

AT Command Mode (ATC):

• Control connections dynamically via AT commands
• Both active and passive connections supported
• Allows runtime configuration changes
• Patented Sollae Systems technology

UDP Mode (U2S):

• Connectionless communication
• Broadcast and multicast support
• Low-latency data transfer
• N:M topology (many-to-many communication)

Power Specifications

• Input Voltage: DC 5V ±0.5V (±10%)
• Current Consumption: 190mA typical
• Power Connector: DC jack (Outer: Ø3.5mm, Inner: Ø1.35mm)
• Protection: Over-current, reverse voltage, and surge protection

Environmental Specifications

• Operating Temperature: -40°C to +85°C (-40°F to 185°F)
• Storage Temperature: -40°C to +85°C
• Humidity: 5% to 95% RH, non-condensing
• Certifications: KC, CE, FCC Class A, RoHS compliant

Physical Specifications

• Dimensions: 94mm (W) x 57mm (L) x 24mm (H) (3.7" x 2.24" x 0.94")
• Weight: Approximately 64g (2.26 oz)
• Mounting: Desktop (compact footprint)
• Enclosure: Industrial-grade plastic housing

Status Indicators (LEDs)

Top Panel LEDs:

• PWR (Red): Power indicator (On = power supplied)
• STS (Yellow): Status indicator
  • Blinks every second = Obtaining IP address
  • Blinks 4 times = No IP address (DHCP/PPPoE failure)
  • On = TCP connection established
  • Off = ISP mode
  • Simultaneous blink with LINK/RXD/TXD = Serial Configuration mode
• LINK (Green): Ethernet link status (On = connected)
• RXD (Yellow): Ethernet receive activity (Blinks = receiving data)
• TXD (Green): Ethernet transmit activity (Blinks = transmitting data)

Front Panel LEDs:

• Serial RXD (Yellow): Serial receive activity
• Serial TXD (Green): Serial transmit activity

Real-World Applications

🏭 Industrial Automation & SCADA

• Connect PLCs, RTUs, and industrial controllers to SCADA systems
• Multi-drop RS-485 networks for sensor arrays and I/O modules
• Remote monitoring and control of manufacturing equipment
• Building automation and energy management
• Factory floor data collection and distribution
• Process control and monitoring

⚡ Energy & Utilities

• Smart grid monitoring and control
• Substation automation (IEC 61850)
• Remote meter reading (AMR/AMI) via RS-485 networks
• Power distribution management
• Environmental monitoring stations
• Solar and wind farm monitoring

🏗️ Building Management Systems (BMS)

• HVAC control systems
• Lighting control networks
• Access control and security systems
• Fire alarm panels
• Energy management systems
• Multi-building campus networks

🚂 Transportation & Infrastructure

• Railway signaling and control systems
• Traffic management and ITS applications
• Airport ground support equipment
• Parking management systems
• Toll collection systems
• Fleet management

📡 Telecommunications

• Serial console access to network equipment
• Remote management of telecom infrastructure
• Base station monitoring and control
• Network operations center (NOC) equipment
• Multi-drop equipment monitoring

🔬 Laboratory & Research

• Network analytical instruments via RS-485
• Automated testing equipment
• Quality control systems
• Research data acquisition
• Environmental monitoring networks

🏥 Healthcare & Medical

• Laboratory automation systems
• Medical equipment networking
• Building management in healthcare facilities
• Environmental monitoring (temperature, humidity)
• Equipment status monitoring

💧 Water & Wastewater Treatment

• SCADA systems for water treatment plants
• Remote pump station monitoring
• Flow meter data collection
• Chemical dosing control
• Multi-site monitoring networks

As well as industrial environments, the CSE-H55N2 is ideal for serial RS-422 / RS-485 to Ethernet control of diverse applications such as:

What's in the Box

✓ CSE-H55N2 RS-422/RS-485 to Ethernet Converter (1 unit)
✓ Quick Start Guide
✓ Software available for download:

• ezManager (Configuration utility for Windows)
• ezVSP (Virtual Serial Port driver for Windows)
• ezTerm (TCP/IP communication test tool)
• User manual (PDF)
• Datasheet (PDF)

All software is available for download from the Sollae Systems ezTCP website. See the link under the Technical Support & Resources section below.

Optional Accessories

Quick Setup Guide

Step 1: Physical Connections

For RS-422 (Full-Duplex):

• Connect TX+, TX-, RX+, RX- to terminal block pins 1, 2, 4, 5
• Connect GND to pins 3 and 6
• Configure as RS-422 in ezManager

For RS-485 (Half-Duplex):

• Connect TRX+, TRX- to terminal block pins 1, 2
• Connect GND to pins 3 and 6
• Configure as RS-485 in ezManager
• Enable termination resistors on first and last devices only

Network & Power:

• Connect Ethernet cable to your network (straight or crossover - auto-detected)
• Connect 5V DC power adapter
• PWR LED will illuminate when powered on

Step 2: Network Configuration

Default Settings:

• IP Address: 10.1.0.1
• Subnet Mask: 255.0.0.0
• Local Port: 1470
• Communication Mode: TCP Server
• Serial Type: RS-485
• Baud Rate: 19,200 bps
• Data Format: 8-N-1 (8 data bits, No parity, 1 stop bit)

Configuration Methods:

Option A - ezManager via Ethernet (Recommended):

1. Download and run ezManager (no installation required)
2. Click [MAC Address Search] or [IP Address Search] to discover CSE-H55N2
3. Select the device
4. Configure network, serial, and communication parameters
5. Click [Write] to save settings
6. Device will reboot automatically

Option B - Serial Configuration:

1. Press function button for 1-3 seconds to enter Serial Configuration mode
2. All LEDs (STS, LINK, RXD, TXD) blink simultaneously
3. Open ezManager, select [Serial] tab
4. Select COM port and click [Open]
5. Click [Read] to load current settings
6. Modify parameters as needed
7. Click [Write] to save

Option C - AT Commands:

1. Set communication mode to "AT Command" via ezManager
2. Connect via serial terminal (matching baud rate, 8-N-1)
3. Use AT commands to configure parameters
4. Save with AT+PWP command

Step 3: Test Communication

1. Use ezManager's [Simple Test] feature
2. Configure TCP connection (IP address and port)
3. Open serial port with matching parameters
4. Send test data in both directions to verify operation

Total setup time: 5-10 minutes

Advanced Features & Capabilities

RS-422/RS-485 Flexibility

RS-422 Mode (Full-Duplex):

• Point-to-Point (1:1): Direct connection between two devices
• Multi-Drop (1:N): One master transmitter, multiple receivers
• Maximum Distance: 4,000 feet (1,200m)
• Advantages: Full-duplex, simultaneous bidirectional communication
• Use Cases: Long-distance point-to-point links, distributed monitoring

RS-485 Mode (Half-Duplex):

• Multi-Drop Network: Up to 32 devices on one bus
• Maximum Distance: 4,000 feet (1,200m)
• Topology: Daisy-chain (linear bus)
• Advantages: Multiple devices on single cable pair, cost-effective
• Use Cases: Modbus RTU, Profibus, BACnet MS/TP, building automation

Built-in Protection:

• 3.9kΩ Biasing Resistors: Embedded on all serial lines for idle state stability
• TVS Protection: Transient Voltage Suppression protects against electrical spikes
• Enhanced Noise Immunity: Upgraded design from CSE-H55N for improved stability

IPv6 Dual Stack Implementation

The CSE-H55N2 is fully IPv6-ready with comprehensive support:

IPv6 Features:

• Full IPv4/IPv6 dual stack operation
• Stateless address auto-configuration (SLAAC)
• Stateful address configuration (DHCPv6)
• IPv6 fragmentation support
• ICMPv6, TCPv6, UDPv6 protocols
• Seamless IPv4/IPv6 interoperability

Why IPv6 Matters:

• Future-proof your infrastructure
• Larger address space eliminates NAT complexity
• Improved security with IPsec integration
• Better support for IoT devices
• Simplified network configuration

Multiple Connection Support

Simultaneous Monitoring (Firmware v2.3A+):

• Multiple TCP clients can connect to one CSE-H55N2 simultaneously
• Perfect for distributed monitoring applications
• Each client receives the same serial data
• Ideal for redundant monitoring systems
• No additional hardware required

Use Cases:

• Multiple operators monitoring the same equipment
• Redundant data logging systems
• Distributed SCADA architectures
• Multi-site monitoring applications
• Backup monitoring stations

SSL/TLS Security

Secure Socket Layer Protection:

• Encrypt serial data over the network
• Protect sensitive information in transit
• Industry-standard SSL/TLS protocols
• Certificate-based authentication
• Prevents eavesdropping and tampering

Security Features:

• IP address filtering (whitelist/blacklist)
• MAC address filtering
• Password-protected configuration
• Secure firmware updates
• Access control lists

Packet Fragmentation Control

Separator Settings:

• Define custom packet delimiters
• Control when data is transmitted over network
• Optimize for different protocols and applications
• Reduce network overhead
• Improve application-level parsing

Data Frame Interval:

• Configure timeout for packet assembly
• Balance real-time performance vs. network efficiency
• Adjustable from 0ms (immediate) to custom values
• Optimize for your specific application

Telnet COM Port Control (RFC 2217)

Remote Serial Port Control:

• Change serial parameters remotely over network
• Adjust baud rate, parity, data bits, stop bits
• Control flow control settings
• Monitor serial port status
• No physical access required

Benefits:

• Remote troubleshooting and diagnostics
• Dynamic serial parameter adjustment
• Centralized serial port management
• Reduced site visits and maintenance costs

Dynamic DNS (DDNS) Support

Always Accessible:

• Automatic DNS updates when IP address changes
• Use hostname instead of IP address
• Perfect for dynamic IP environments
• Supports major DDNS providers
• Simplified remote access

PPPoE Support

Direct Internet Connection:

• Connect directly to DSL/cable modems
• No router required for simple deployments
• Automatic authentication and connection
• Ideal for remote installations
• Reduced hardware costs

AT Command Mode

Patented Dynamic Control:

• Change connection parameters at runtime
• Establish/terminate connections via serial commands
• No device reboot required
• Perfect for applications requiring dynamic connectivity
• Unique Sollae Systems technology

AT Command Capabilities:

• Configure IP addresses and ports
• Establish TCP connections
• Control DHCP and PPPoE
• Set DNS servers
• Modify timeout values
• Save settings to flash memory

Software Suite

ezManager - Configuration Utility

Comprehensive Management Tool for Windows:

Features:

• No installation required (portable application)
• Automatic device discovery via MAC or IP address
• Intuitive graphical interface
• Real-time status monitoring
• Firmware update management
• Configuration backup and restore
• Simple test utility included
• Batch configuration for multiple devices

Configuration Methods:

• Via Ethernet (LAN)
• Via Serial port
• Remote configuration via Telnet

ezVSP - Virtual Serial Port Driver

Windows Virtual COM Port Driver:

Features:

• Creates virtual COM ports on Windows PC
• Legacy applications work without modification
• Supports multiple virtual ports
• Automatic reconnection on network interruption
• Compatible with Windows 7/8/10/11
• No application changes required

How It Works: The CSE-H55N2 appears as a local COM port on your Windows PC. Your existing serial software communicates with the virtual port, and ezVSP handles all network communication transparently.

ezTerm - Communication Test Tool

Simple TCP/IP Testing:

Features:

• Quick TCP/IP communication testing
• Both TCP and UDP support
• Server and client modes
• Hex and ASCII data display
• Data logging capabilities
• Perfect for troubleshooting

Smartphone Applications

Mobile Configuration:

• ezManager app available for iOS and Android
• Configure devices from your smartphone or tablet
• Monitor status remotely
• Perfect for field installations
• Free download from app stores

RS-485 Network Configuration Guide

Termination Resistors

RS-485 networks require 120Ω termination resistors at both ends of the bus:

• Enable termination on the first and last devices only
• Disable termination on all middle devices
• Improper termination causes communication errors and reflections
• Use quality 120Ω resistors rated for your application

Biasing Resistors

The CSE-H55N2 includes embedded 3.9kΩ biasing resistors:

• Purpose: Maintain idle state voltage levels on the bus
• Benefit: Prevents false triggering and improves noise immunity
• Built-in: No external biasing resistors required

Wiring Best Practices

Cable Selection:

• Use twisted pair cable (Cat5e or better, or dedicated RS-485 cable)
• Shielded cable recommended in electrically noisy environments
• Characteristic impedance: 120Ω for proper termination

Topology:

• Use daisy-chain topology (linear bus)
• Avoid star topology (creates reflections)
• Keep stubs shorter than 1 meter
• Maximum bus length: 4,000 feet (1,200m)

Grounding:

• Connect GND at both ends (pins 3 and 6)
• Maintain proper grounding to prevent ground loops
• Use single-point ground when possible
• Shield grounding: Ground shield at one end only to prevent ground loops

Multi-Drop Addressing

For RS-485 networks with multiple devices:

• Each device needs a unique address (configured in serial device)
• CSE-H55N2 acts as transparent bridge (no addressing required)
• Use Modbus RTU, Profibus, BACnet MS/TP, or other multi-drop protocols
• Configure appropriate timeout values for polling applications
• Maximum devices: 32 per bus (standard RS-485 limit)

Signal Quality

Differential Signaling:

• RS-485 uses differential signaling (Data+ and Data-)
• Common-mode noise rejection: Excellent immunity to electrical interference
• Voltage levels: Typically ±200mV to ±6V differential

Noise Immunity:

• TVS protection: Built-in transient voltage suppression
• Biasing resistors: Embedded 3.9kΩ resistors for idle state stability
• Shielded cable: Use in high-EMI environments

RS-422 Network Configuration Guide

1:1 Configuration (Point-to-Point)

Standard RS-422 Connection:

• Connect TX+ to RX+, TX- to RX- on both ends
• Full-duplex communication
• Maximum distance: 4,000 feet (1,200m)
• No termination resistors required for short distances
• Use 120Ω termination for long distances or high speeds

1:N Configuration (Multi-Drop)

One Transmitter, Multiple Receivers:

• One CSE-H55N2 transmits (TX+, TX-)
• Multiple devices receive (RX+, RX-)
• Up to 10 receivers typical (depends on driver capability)
• Termination resistors at both ends of receive line
• Ideal for distributed monitoring applications

Signal Ground, Biasing, and Termination

Ground Connection:

• Connect GND (pins 3 and 6) at both ends
• Prevents ground potential differences
• Improves signal integrity

Biasing Resistors:

• Embedded 3.9kΩ biasing resistors included
• Maintains idle state voltage levels
• No external biasing required

Termination Resistors:

• 120Ω resistors at both ends of long cables
• Prevents signal reflections
• Required for high-speed or long-distance applications

Operation Modes

Normal Mode

Standard Operation:

• For normal data communication
• Four communication modes available (TCP Server, TCP Client, AT Command, UDP)
• Configuration via ezManager or Telnet
• Real-time status monitoring
• Default operating mode

Serial Configuration Mode

Serial Port Configuration:

• Configure via RS-422/485 port
• Use ezManager Serial tab
• No network connection required
• Perfect for initial setup or network troubleshooting

How to Enter:

• Press function button for 1-3 seconds
• All LEDs (STS, LINK, RXD, TXD) blink simultaneously
• Connect via serial port with matching parameters

ISP Mode (In-System Programming)

Firmware Updates:

• For upgrading firmware
• Bypass security settings (password recovery)
• Direct firmware upload via ezManager
• Factory reset capability
• Emergency recovery mode

How to Enter:

• Press function button for more than 3 seconds during power-on
• STS LED turns off
• Upload firmware via ezManager

Network Topology Examples

1:1 Direct Connection

Simple point-to-point connection for testing or isolated systems.

LAN Integration

Multiple PCs access RS-485 multi-drop network over local network.

Internet Access via Router

Remote access to serial devices from anywhere in the world.

Serial Tunneling

Extend serial connections over long distances via Ethernet.

Multiple Monitoring

Multiple clients simultaneously monitor one RS-485 network (firmware v2.3A+).

Multi-Drop RS-485 Network

Classic RS-485 multi-drop topology with up to 32 devices.

Frequently Asked Questions

Q: What's the difference between the CSE-H55N2 and the CSE-H53N?
A: The CSE-H55N2 supports RS-422/RS-485 (long-distance, multi-drop capable), while the CSE-H53N supports RS-232 only (short-distance, point-to-point). The CSE-H55N2 is ideal for industrial multi-drop networks up to 4,000 feet, while the CSE-H53N is for simple RS-232 device networking.

Q: What's the difference between the CSE-H55N2 and the original CSE-H55N?
A: The CSE-H55N2 is an upgraded version with improved stability against noise and electrical damage on RS-422/485 lines. It features enhanced protection with embedded TVS and better noise immunity. The software functionality remains the same.

Q: Can I use this for Modbus RTU networks?
A: Yes! The CSE-H55N2 is perfect for Modbus RTU over RS-485. It acts as a transparent bridge, allowing your Modbus master to communicate with up to 32 Modbus slave devices over Ethernet. The converter doesn't interpret Modbus protocol—it simply passes data transparently.

Q: How many devices can I connect on an RS-485 network?
A: Standard RS-485 supports up to 32 devices (unit loads) per bus. The CSE-H55N2 counts as one device. For larger networks, use RS-485 repeaters to extend beyond 32 devices.

Q: Do I need termination resistors?
A: Yes, RS-485 networks require 120Ω termination resistors at both ends of the bus (first and last devices). The CSE-H55N2 includes embedded biasing resistors but you must add external termination resistors at the bus ends.

Q: What's the maximum cable distance?
A: RS-422/RS-485 supports up to 4,000 feet (1,200m) at lower baud rates. At maximum baud rate (230.4 kbps), distance may be limited to 100-300 feet depending on cable quality and environmental noise.

Q: Does the CSE-H55N2 support IPv6?
A: Yes! The CSE-H55N2 has full IPv4/IPv6 dual stack support with both stateless (SLAAC) and stateful (DHCPv6) address auto-configuration. It's fully ready for modern IPv6 networks.

Q: Can multiple computers access the serial network simultaneously?
A: Yes, with firmware version 2.3A or later, multiple TCP clients can connect to the CSE-H55N2 simultaneously. All connected clients receive the same serial data, perfect for distributed monitoring applications.

Q: What is AT Command mode?
A: AT Command mode is a patented Sollae Systems feature that allows you to control TCP/IP connections dynamically via serial AT commands. You can establish connections, change IP addresses, modify ports, and configure network parameters without rebooting the device.

Q: How do I configure the CSE-H55N2?
A: You have multiple options: (1) ezManager via Ethernet, (2) ezManager via serial port, (3) AT commands via serial terminal, or (4) Telnet. Choose the method that works best for your deployment.

Q: What is the default IP address?
A: The default IP address is 10.1.0.1 with subnet mask 255.0.0.0. The default local port is 1470, serial type is RS-485, and the default serial settings are 19,200 bps, 8-N-1.

Q: Can I use this outdoors?
A: The CSE-H55N2 is rated for industrial temperatures (-40°C to +85°C) but is not waterproof. For outdoor use, install in a weatherproof enclosure (NEMA 4X or IP65 rated).

Q: Does it support SSL/TLS encryption?
A: Yes, the CSE-H55N2 includes SSL/TLS support for secure data transmission over the network. This protects your serial data from eavesdropping and tampering.

Q: What operating systems are supported?
A: The device works with any OS that supports TCP/IP (Windows, Linux, macOS, Unix, etc.). The ezManager and ezVSP utilities are Windows-only, but you can configure via Telnet or AT commands from any platform.

Technical Support & Resources

Videos

Sollae Systems ezTCP CSE-H55N2 Introductory video