General
Serial ports	8 RS-232/422/485
Ethernet interfaces	2 10/100BaseT(X), RJ45
Operating temperature	0–55 °C
Air humidity	5–95 %, nicht kondensierend

The Moxa CN2650-8-2AC is an industrial terminal server designed for integrating serial devices into IP-based networks. It features eight serial ports supporting RS-232, RS-422, and RS-485, and is specifically designed for applications requiring high availability and redundancy. The device is housed in a 48,3 cm ( 19 inch ) metal rack enclosure and is suitable for use in critical infrastructures such as power supply, automation systems, and industrial communication networks. The integrated Dual-LAN function enables the use of two independent network connections, thereby increasing network availability. Additionally, the model features Dual-AC power supply, ensuring continuous power even if one of the two inputs fails.

Applications

The terminal server is designed for use in industrial environments where reliable and disturbance-free serial communication over IP networks is required. Typical application scenarios include networking of measuring devices, controls, sensors, and other serial end devices in power plants, factories, transportation infrastructure, and building technology. Redundancy features such as Dual-LAN, Dual-Host Fallback, and Dual-AC inputs make the device particularly suitable for critical applications where communication failure is not tolerable.

Functions and Equipment in Detail

The CN2650-8-2AC supports various operating modes, including Real COM, TCP/UDP Server/Client, RFC2217, PPP, Reverse Telnet, DRDAS, and the Redundant COM mode. The latter transmits incoming serial data simultaneously over two separate networks, with duplicate packets automatically detected and discarded. This function is configured via a software tool and ensures high availability of serial communication. Configuration is performed via a Web-GUI (HTTP/HTTPS), Telnet, Serial Console, DSU, or a Windows utility. The devices are equipped with an LCD display that facilitates IP configuration directly on the device—except for models with -T designation.

Technology Explained Simply

The serial ports support RS-232, RS-422, and RS-485 standards, suitable for different transmission distances and environmental conditions. The Ethernet interfaces operate with 10/100BaseT(X) and are equipped with RJ45 connectors. The 1.5 kV isolation protects the device against transient voltage spikes. The Dual-LAN function allows connection to two independent networks, increasing availability. MAC/IP separation ensures that the two network connections can be addressed independently. The Dual-Host function enables automatic switching to a secondary host if the primary host is unreachable. The Dual-AC power supply provides redundant power, ensuring operational safety in case one of the two inputs fails.

Compatibility and Accessories

The terminal server is compatible with a wide range of operating systems, including Windows (95 to 10), server systems (2003 to 2019), Linux, UNIX, macOS, and Android from version 3.1. Security features include HTTPS, AES-128/256, RADIUS, SSHv2, PAP, and CHAP. Configuration is performed via various interfaces, including Web-GUI, Telnet, Serial Console, DSU, and a Windows utility. The devices are certified with EN 55032, CISPR 32, FCC Part 15B, UL 60950-1 / UL 62368-1, and RoHS. The operating temperature for standard models is 0 to 55 °C, and for -T models, -40 to 85 °C. Humidity ranges from 5 to 95 %, non-condensing. The MTBF is up to 831,925 hours, depending on the model.

Mounting and Installation

The device is housed in a 48,3 cm ( 19 inch ) metal rack enclosure and can be mounted in standard racks. The delivery includes the terminal server device, an RJ45-to-DB9 console cable, 1 to 2 network cables (model-dependent), a rack mounting kit, installation instructions, and a warranty card. Installation is performed using the provided mounting components, enabling secure fixation in the rack. Configuration can be done directly on the device via the LCD display (for models without -T designation) or using the provided software tools.

Operational Advantages

The CN2650-8-2AC offers high operational reliability through integrated redundancy functions such as Dual-LAN, Dual-Host Fallback, and Dual-AC power supply. Support for various operating modes and compatibility with numerous operating systems increase flexibility when integrating into existing systems. The Web-GUI and software tools simplify configuration and maintenance. Certifications and high MTBF underscore the device's reliability for industrial use. The operating temperature ranges allow use in a variety of environments, including extreme temperatures for -T models.