General
Interface standards	RS-232 / RS-422 / RS-485
Connector type	DB9

The Moxa CN2650I-16 is an industrial terminal server from the CN2600 series, designed for integrating serial devices into Ethernet networks. It features 16 serial interfaces supporting RS-232, RS-422, and RS-485 standards, and is designed for applications requiring high availability and fault tolerance. The devices are suitable for use in industrial environments with high demands on network stability and communication reliability, particularly in production facilities, power supply systems, or transportation technology.

Applications
This terminal server is suitable for connecting legacy devices, such as sensors, controls, measuring instruments, or industrial machines communicating via serial interfaces, into existing IP-based networks. It enables remote control, monitoring, and configuration of these devices over Ethernet, facilitating integration into modern IT infrastructures. The high redundancy provided by dual LAN cards and dual host support makes it especially suitable for critical applications where communication interruption is not acceptable.

Functions and Features in Detail
A central feature of the CN2650I-16 is the Redundant COM mode, in which all serial data packets are transmitted simultaneously over two independent LAN connections. In the event of a network failure, communication remains active without data loss. Additionally, the device supports the Dual-Host mode, where a secondary host PC automatically takes over if the primary host fails. The serial interfaces are available via DB9 connectors, enabling direct connection to standard industrial devices. Configuration is performed via a web interface, Telnet, or a Windows utility, allowing flexible adaptation to different environments.

Technology Explained Simply
The terminal server features two 10/100BaseT(X) Ethernet ports (RJ45), providing redundant network connections. Magnetic isolation of 1.5 kV protects against electrical interference and voltage spikes, enhancing reliability in industrial environments. Operating modes include Real COM, TCP/UDP Server/Client, Terminal, PPP, DRDAS mode, Reverse Telnet, and RFC2217, ensuring broad compatibility with various application scenarios. Power supply is via an input of 100–240 VAC, enabling flexible installation at different mains voltages.

Compatibility and Accessories
The CN2650I-16 is compatible with a wide range of operating systems, including Windows (95 to 10, Server 2003–2019), Linux (kernel 2.4.x to 5.x), UNIX, macOS, and Android (from version 3.1). Security features include authentication via RADIUS and local database, encryption with HTTPS, AES-128/256, and RSA-1024, as well as protocols such as SSHv2, SNMPv1/v2c/v3, PAP, and CHAP. These features ensure secure access and data transmission. Included accessories are a rack mounting kit, an RJ45-DB9 cable, one or two network cables (depending on model), a quick start guide, and a warranty card.

Mounting and Installation
The device is housed in a metal 48,3 cm ( 19 inch ) rack enclosure and can be directly mounted in standard racks. Dimensions are 480 × 198 × 45.5 mm, with a weight ranging from 2.41 to 4.42 kg. Mounting is done using the included rack mounting kit. Installation requires no special tools, as cabling is done via standardized connectors.

Operational Advantages
Operation of the CN2650I-16 is characterized by high availability and reliability. The MTBF (Mean Time Between Failures) is up to 831,925 hours, indicating a very long service life and low failure probability. Support for extreme temperatures (up to -40 to +85 °C for -T models) extends the application range to harsh environments. Certifications include UL 60950-1, UL 62368-1, EN 55032/24/35, and FCC Part 15B, as well as compliance with RoHS, CRoHS, and WEEE, ensuring adherence to international safety and environmental standards.