Sollae Systems CSE-M73G Embedded Serial to Ethernet Module with RJ-45 RS232/RS422/RS485

Compact OEM serial to Ethernet Module with Integrated RJ-45 Connector: Integrate professional-grade serial-to-Ethernet connectivity directly into your products with this compact 64mm x 40mm module featuring a built-in RJ-45 connector and multiple serial interface options.

The Sollae Systems CSE-M73G is an industrial-grade embedded serial-to-Ethernet module designed for OEM integration into equipment, instruments, and devices. With its compact footprint (64.3mm x 40mm x 17mm), integrated RJ-45 connector, built-in RS-232/RS-422/RS-485 interfaces, pin-compatible design with CSE-M73/M73A, and support for both IPv4 and IPv6, the CSE-M73G delivers enterprise-level networking performance in a package perfect for embedded applications requiring ready-to-use Ethernet connectivity.

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Why Choose the CSE-M73G?

🔌 Integrated RJ-45 Connector

Built-in RJ-45 connector with integrated magnetics eliminates the need for external Ethernet components. Simply plug in a standard Ethernet cable and you're connected—no additional circuitry required.

🔧 Built-In Serial Interfaces

Complete RS-232, RS-422, and RS-485 interface circuitry built into the module. No external level shifters or transceivers needed—just connect your serial device to the appropriate header.

📦 Compact OEM Design

At 64.3mm x 40mm x 17mm and weighing only 17g, the CSE-M73G provides a complete serial-to-Ethernet solution in a compact package perfect for embedding directly into your products.

🔄 Pin-Compatible with CSE-M73/M73A

Drop-in compatible design allows easy migration from CSE-M73 or CSE-M73A modules. Standardize on one footprint across your product line while leveraging the latest features.

🔌 Versatile Serial Interfaces

Support for RS-232, RS-422, RS-485, AND 3.3V UART—all from one module. Choose the interface that matches your application with simple connector selection.

🌐 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.

🏭 Industrial-Grade Reliability

Extreme temperature range (-40°C to +85°C) and robust design make this module perfect for harsh industrial environments where consumer-grade components fail.

🔒 Enhanced Security

Built-in TLS v1.2 encryption, IP/MAC filtering, and password protection ensure your serial data remains secure across the network.

🔄 Multiple Connection Support

Monitor and control from up to 8 locations simultaneously. Multiple clients can connect to a single CSE-M73G for distributed monitoring and control applications.

⚡ High-Speed Performance

UART support up to 230.4 kbps ensures fast, reliable data transfer for even the most demanding serial applications.

🎯 Easy Integration

Standard 2.54mm pitch pin headers, integrated RJ-45 connector, comprehensive documentation, and free configuration software make integration straightforward.

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CSE-M73G Technical Specifications

Serial Interface

Physical Interfaces:

• RS-232: JP1/JP2 (6-pin, 2.54mm pitch)
• RS-422/RS-485: JP4/JP5 (6-pin, 2.54mm pitch)
• 3.3V UART: JP3 (6-pin, 2.54mm pitch, 5V tolerant input)

Serial Parameters:

• Baud Rate: 300 to 230,400 bps
• Data Bits: 8 bits, 7 bits (with parity)
• Parity: None, Even, Odd, Mark, Space
• Stop Bits: 1, 2
• Flow Control: None, RTS/CTS, XON/XOFF

Note:

• 7 data bits with NONE parity is not supported
• A single idle bit is automatically added after every stop bit by the MCU function

RS-232 Interface (JP1/JP2)

Pin Assignment (6-pin, 2.54mm pitch):

1. VCC - DC 5V Power
2. RXD - Receive Data (RS-232 level, Input)
3. TXD - Transmit Data (RS-232 level, Output)
4. GND - Ground
5. RTS - Request To Send (RS-232 level, Output)
6. CTS - Clear To Send (RS-232 level, Input)

Features:

• Full RS-232 signal support with built-in level shifters
• Hardware flow control (RTS/CTS)
• Pins with same number on JP1 and JP2 are connected
• No external components required

RS-422/RS-485 Interface (JP4/JP5)

Pin Assignment (6-pin, 2.54mm pitch):

1. VCC - DC 5V Power
2. TRX+ - TX+ (RS-422) / Data+ (RS-485)
3. TRX- - TX- (RS-422) / Data- (RS-485)
4. GND - Ground
5. RX+ - RX+ (RS-422 only)
6. RX- - RX- (RS-422 only)

Features:

• Built-in RS-422/485 transceivers
• RS-422: Full-duplex, point-to-point or multi-drop
• RS-485: Half-duplex, multi-drop up to 32 devices
• Pins with same number on JP4 and JP5 are connected
• Note: Module does not include termination resistors (add externally as needed)

3.3V UART Interface (JP3)

Pin Assignment (6-pin, 2.54mm pitch):

1. VCC - DC 5V Power
2. RXD - Receive Data (3.3V level, 5V tolerant input)
3. TXD - Transmit Data (3.3V level, Output)
4. GND - Ground
5. RTS - Request To Send (3.3V level, Output)
6. CTS - Clear To Send (3.3V level, Input)

Electrical Characteristics:

• VIH (High-level input): 1.5V to 5.5V
• VIL (Low-level input): -0.3V to 0.9V
• VOH (High-level output): 2.3V min
• VOL (Low-level output): 0.2V max
• 5V Tolerant Input: Safe for direct connection to 5V microcontrollers

Network Interface

Ethernet:

• Port: Integrated RJ-45 connector with built-in magnetics
• Speed: 10Base-T or 100Base-TX (Auto-Sensing)
• Cable Detection: Auto MDI/MDIX (works with straight or crossover cables)
• Pin Assignment:
  • Pin 1: TX+ (Output)
  • Pin 2: TX- (Output)
  • Pin 3: RX+ (Input)
  • Pin 6: RX- (Input)

Network Protocols:

• IPv4: TCP, UDP, IP, ICMP, ARP, DHCP, PPPoE, DNS, DDNS
• IPv6: ICMPv6, TCPv6, UDPv6, IPv6 fragmentation
• IPv6 Configuration: Stateless and Stateful (DHCPv6) auto-configuration
• Security: TLS v1.2 (Secure Socket Layer)
• Management: Telnet
• 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
• Supports up to 8 simultaneous connections
• 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 ±10% (4.5V to 5.5V)
• Current Consumption: 95mA typical
• Power Input: All VCC/GND pins on JP1-JP5 can be used
• Power Connector: Standard 2.54mm pin headers

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: RoHS compliant

Physical Specifications

• Dimensions: 64.3mm (W) x 40mm (L) x 17mm (H) (2.53" x 1.57" x 0.67")
• Weight: Approximately 17g (0.6 oz)
• Mounting: Surface mount via pin headers
• Connectors:
  • 5 x 6-pin headers (2.54mm pitch)
  • 1 x RJ-45 connector (integrated)
  • 1 x ISP jumper (JP6)

Status Indicators (LEDs)

RJ-45 Connector LEDs:

• Yellow LED (STS):

  • Blinks every second: Obtaining IP address
  • Blinks 4 times: No IP address (DHCP/PPPoE failure)
  • ON: TCP connection established
  • Blinks shortly: Sending TCP data
  • OFF: ISP mode
  • Simultaneous blink with Green: Serial Configuration mode

• Green LED (LINK):

  • ON: Ethernet connected
  • OFF: No Ethernet connection
  • Blinks shortly: Receiving TCP data

Power LED:

• Red LED: ON when power supplied

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Real-World Applications

🏭 Industrial Equipment OEM Integration

• Embed networking into PLCs, controllers, and industrial instruments
• Factory automation equipment
• Process control devices
• Manufacturing machinery
• Industrial sensors and actuators

🔬 Medical & Laboratory Equipment

• Diagnostic equipment networking
• Laboratory instruments
• Medical imaging devices
• Patient monitoring systems
• Analytical equipment

🏗️ Building Automation

• HVAC controllers
• Lighting control systems
• Access control panels
• Fire alarm systems
• Energy management devices

⚡ Energy & Utilities

• Smart meters
• Power monitoring devices
• Substation equipment
• Solar inverters
• Battery management systems

🚗 Transportation & Automotive

• Vehicle telematics
• Fleet management devices
• Parking systems
• Traffic control equipment
• Railway signaling

📡 Telecommunications

• Network equipment
• Base station controllers
• Telecom infrastructure
• Remote monitoring devices

🎮 Consumer Electronics

• Gaming peripherals
• Home automation devices
• Smart appliances
• IoT devices
• Entertainment systems

🔧 Test & Measurement

• Oscilloscopes
• Data loggers
• Environmental monitors
• Quality control equipment
• Calibration devices

The CSE-M73G is especially suitable for:

• Multi Monitoring
• Solar Energy Management Systems

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What's Included

✓ CSE-M73G Serial to Ethernet Module (1 unit)
✓ Documentation:

• User Manual (PDF)
• Datasheet (PDF)
• Integration guide

✓ Software available for download:

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

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

Note: This is an OEM module. Power supply (5V DC) required. RS-232/422/485 interface circuitry is built-in—just connect your serial device.

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Quick Integration Guide

Step 1: Hardware Connection

Power:

• Connect regulated 5V DC to any VCC/GND pins on JP1-JP5
• Typical current: 95mA

Ethernet:

• Connect standard Ethernet cable to integrated RJ-45 connector
• Auto MDI/MDIX supports both straight and crossover cables

Serial Interface (Choose One):

• RS-232: Connect to JP1 or JP2 (6-pin header)
• RS-422/RS-485: Connect to JP4 or JP5 (6-pin header)
• 3.3V UART: Connect to JP3 (6-pin header)

Step 2: Initial 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-232
• Baud Rate: 19,200 bps
• Data Format: 8-N-1 (8 data bits, No parity, 1 stop bit)

Configuration Methods:

1. Via Ethernet: Use ezManager to discover and configure
2. Via Serial: Enter Serial Configuration mode (ISP jumper < 1 second)
3. AT Commands: Set communication mode to AT Command and use serial terminal

Step 3: Testing

1. Power on the module
2. Verify LED indicators (Power, LINK, STS)
3. Use ezManager to discover module on network
4. Configure network and serial parameters
5. Test data communication using ezTerm or Simple Test feature
6. Verify bidirectional data flow

Total integration time: 1-2 hours (experienced engineers)

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Advanced Features & Capabilities

Multiple Connection Support (Up to 8 Simultaneous)

Simultaneous Monitoring:

• Up to 8 TCP clients can connect to one CSE-M73G 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
• Primary + backup + cloud logging

IPv6 Dual Stack Implementation

The CSE-M73G 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 for OEM Products:

• Future-proof your product line
• Larger address space for IoT deployments
• Improved security with IPsec integration
• Better support for mobile and distributed devices
• Simplified network configuration

TLS v1.2 Security

Secure Socket Layer Protection:

• Encrypt serial data over the network
• Protect sensitive information in transit
• Industry-standard TLS v1.2 protocol
• 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 field service 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

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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-M73G 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

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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 any serial port (RS-232, RS-422, RS-485, or 3.3V UART)
• Serial parameters: 115,200 bps, 8-N-1
• Use ezManager Serial tab
• No network connection required
• Perfect for initial setup or network troubleshooting

How to Enter:

• Connect ISP jumper (JP6) for less than 1 second
• Both LEDs blink simultaneously
• Connect via serial port at 115,200 bps

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:

• Connect ISP jumper (JP6) for more than 1 second during power-on
• Both LEDs turn OFF
• Upload firmware via ezManager

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Pin-Compatibility Notes

CSE-M73 vs CSE-M73A vs CSE-M73G

Physical Compatibility:

• All three modules share the same pin-out
• Same 64.3mm x 40mm footprint
• Same connector layout and positions
• Drop-in replacement possible

Functional Differences:

• CSE-M73G: Latest generation, TLS v1.2, enhanced features, up to 8 connections
• CSE-M73A: Previous generation
• CSE-M73: Original version

Important:

• MCU functions differ between versions
• Firmware is NOT interchangeable
• Test compatibility thoroughly before substitution
• Some timing characteristics may vary
• Consult datasheets for specific differences

Migration Recommendations:

• Test CSE-M73G in your application before mass production
• Verify all features work as expected
• Update firmware to latest version
• Review any application-specific timing requirements

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Frequently Asked Questions

Q: What's the difference between CSE-M73G and CSE-M53G?
A: The CSE-M73G includes an integrated RJ-45 connector and built-in RS-232/422/485 interface circuitry (64.3 x 40 x 17mm, 17g). The CSE-M53G requires external Ethernet components and serial interface circuitry (20 x 24 x 9.1mm, 3.2g). Choose CSE-M73G for easier integration with ready-to-use Ethernet and serial interfaces, CSE-M53G for smallest possible footprint.

Q: What's the difference between CSE-M73G and the standalone CSE-H53N converter?
A: The CSE-M73G is an OEM module for embedding into your products. The CSE-H53N is a complete standalone converter with enclosure, connectors, and power adapter. Choose CSE-M73G for OEM integration, CSE-H53N for standalone applications.

Q: Does the module include RS-232/422/485 interface circuitry?
A: Yes! Unlike the CSE-M53G which requires external level shifters, the CSE-M73G includes built-in RS-232, RS-422, and RS-485 interface circuitry. Just connect your serial device to the appropriate header (JP1/JP2 for RS-232, JP4/JP5 for RS-422/485, JP3 for 3.3V UART).

Q: Can I use multiple serial interfaces simultaneously?
A: No, the module has one UART that can be configured for RS-232, RS-422, RS-485, or 3.3V operation. Choose the interface that matches your application and connect to the appropriate header.

Q: Does the module include termination resistors for RS-485?
A: No, the CSE-M73G does not include built-in termination resistors. Add external 120Ω termination resistors at both ends of your RS-485 bus as needed.

Q: Is the module pin-compatible with CSE-M73 and CSE-M73A?
A: Yes, physically pin-compatible with the same footprint and connector layout. However, there are functional differences due to different MCUs. Always test CSE-M73G in your application before using as a drop-in replacement. Firmware is NOT interchangeable.

Q: Does the CSE-M73G support IPv6?
A: Yes! 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: How many devices can connect to the module simultaneously?
A: Up to 8 TCP clients can connect simultaneously. All connected clients receive the same serial data, perfect for distributed monitoring applications.

Q: What is the maximum baud rate?
A: Up to 230.4 kbps for all serial interfaces (RS-232, RS-422, RS-485, and 3.3V UART).

Q: How do I configure the module?
A: Three methods: (1) ezManager via Ethernet (easiest), (2) ezManager via serial port in Serial Configuration mode, (3) AT commands via serial terminal. Choose the method that works best for your development workflow.

Q: What are the default settings?
A: Default IP: 10.1.0.1, Subnet: 255.0.0.0, Port: 1470, Mode: TCP Server, Serial: RS-232, 19200 bps, 8-N-1. These can be changed via ezManager.

Q: Can I use this in outdoor applications?
A: The module is rated for industrial temperatures (-40°C to +85°C) but is not waterproof. For outdoor use, install in a weatherproof enclosure with proper sealing and environmental protection.

Q: What security features are included?
A: TLS v1.2 encryption, IP/MAC address filtering, password-protected configuration, and secure firmware updates. This provides enterprise-grade security for sensitive applications.

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Technical Support & Resources

CSE-M73G Embedded Serial Ethernet Module with RJ45 Product Page

EZTCP Utility Downloads

CSE-M73G Embedded Serial to Ethernet Module Datasheet

CSE-M73G Embedded Serial to Ethernet Module User Manual

Videos

CSE-M73 Serial Ethernet Module

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Product specifications subject to change without notice. Please verify compatibility with your specific application before production. Sollae Systems and ezTCP are registered trademarks of Sollae Systems Co., Ltd. All product names and trademarks are the property of their respective owners.