General
Number of serial ports	8
Insulation protection	1,5 kV
Maximum baud rate	921,6 kbps
Air humidity	5–95 % (nicht kondensierend)

The Moxa CN2650-8-2AC-T is an industrial terminal server designed for secure and redundant transmission of serial data over networks. It features eight serial ports supporting RS-232/422/485 interfaces, and is specifically designed for applications requiring high availability and stability of communication. The device is part of the CN2600 series and offers features such as Dual-LAN, Dual-Host, and an optional Dual-AC power input, ensuring continuous data transmission even in the event of individual component failures.

Applications
This terminal server is suitable for industrial environments where serial devices such as sensors, controls, machines, or measuring instruments need to be accessed over a network. Typical use cases include automation systems, building automation, energy supply, transportation infrastructure, or remote monitoring systems. Support for common operating systems such as Windows, Linux, UNIX, macOS, and Android enables flexible integration into existing IT infrastructures.

Functions and Equipment in Detail
The CN2650-8-2AC-T provides two independent 10/100BaseT(X) LAN ports with RJ45 connectors, enabling redundant network connections. The integrated Redundant COM function transmits data simultaneously over both networks, so that in the event of a connection failure, the other automatically takes over without data loss. The Dual-Host mode allows parallel connection to two host computers, which is advantageous for highly available systems. The serial interfaces support operating modes such as Real COM, TCP Server/Client, UDP, RFC2217, Terminal, Reverse Telnet, PPP, DRDAS, and Redundant COM. The maximum baud rate is 921.6 kbps, and various flow control methods such as RTS/CTS, DTR/DSR, and XON/XOFF are available.

Technology Explained Simply
The serial ports enable connection to devices communicating via RS-232, RS-422, or RS-485, translating these signals into IP-based network protocols. The network connections are equipped with 1.5 kV isolation protection, safeguarding against electrical interference. Power supply is via a Dual-AC input supporting voltages from 100 to 240 VAC, allowing flexible installation in various regions. The -T designation in the model name indicates an extended operating temperature range from -40 to 85 °C, making the device suitable for extreme environments.

Compatibility and Accessories
The terminal server is compatible with a wide range of operating systems, including Windows 95 to 10, Server 2003 to 2019, Linux Kernel 2.4.x to 5.x, UNIX, macOS, and Android 3.1 and higher. Software support includes drivers for Real COM, TTY, and fixed TTY. For management and configuration, various methods are available, including a Web-GUI, Telnet, serial configuration, DSU, and a Windows utility. Security features include authentication via local database or RADIUS, encryption using HTTPS, AES, RSA, HMAC, and SHA-1, as well as protocols such as SNMPv3 and SSHv2.

Mounting and Installation
The device is housed in a metallic 48,3 cm ( 19 inch ) rack enclosure and can be directly mounted in standard racks. Dimensions are 440/480 mm (depending on model) in width, 198 mm in depth, and 45.5 mm in height. Mounting is done using the included rack mounting kit. Installation requires connecting serial devices via DB9 cables and network connections via RJ45 cables. The quick start guide included in the package supports setup.

Advantages in Operation
The redundancy functions ensure high communication availability, which is particularly important in critical applications. Support for many operating systems and protocols simplifies integration into existing systems. The robust design and extended temperature range make the device suitable for demanding industrial environments. The MTBF is up to 831,925 hours, indicating high reliability. Certifications UL, EN, FCC, RoHS, WEEE, and CRoHS confirm compliance with international standards.

Scope of Delivery
The scope of delivery includes the terminal server, an RJ45-DB9 cable, one or two network cables (depending on model), a rack mounting kit, a quick start guide, and a warranty card.