General
Model	CN2650I-8-2AC
Serial standard	RS-232/422/485
Frequency	50/60 Hz
Air humidity	5–95 % (nicht kondensierend)
Real-time clock

The Moxa CN2650I-8-2AC is an industrial-grade terminal server with eight serial interfaces, designed for use in critical infrastructures and industrial automation environments. The device features Dual-LAN and Dual-AC power inputs, ensuring high fault tolerance and continuous availability. The integrated redundancy allows the use of two independent network connections and power supplies, minimizing operational interruptions. The robust metal housing and 19-inch rack mounting enable easy integration into existing enclosures and network infrastructures.

Applications

The terminal server is suitable for applications requiring reliable and continuous communication between serial devices and networks. These include, for example, monitoring and control of machines in manufacturing industries, integration of legacy devices into modern networks, and remote maintenance of industrial systems. Support for protocols such as SNMP, TCP/IP, and DHCP ensures compatibility with a wide range of operating systems and network environments. Security features such as HTTPS, SSH, and RADIUS are particularly relevant for environments where data integrity and access control are important.

Functions and Equipment in Detail

The CN2650I-8-2AC offers eight galvanically isolated serial ports with RS-232/422/485 standards, accessible via DB9 male connectors. The isolation is 2 kV, ensuring high immunity to interference and protection against voltage surges. The serial interfaces support operating modes such as Real COM, TCP/UDP Client/Server, Terminal, RFC2217, PPP, DRDAS, and Redundant COM. The baud rate can be set between 50 bps and 921,600 bps, allowing flexible adaptation to different devices and transmission speeds. Signals include TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND for RS-232, as well as differential signals and GND for RS-422/485. Control is achieved via ADDC®, pull-up/down resistors, and 120 Ohm termination.

Technology Explained Simply

The Dual-LAN function enables connection via two separate Ethernet ports (10/100BaseT(X), RJ45), each with 1.5 kV isolation. The two LAN interfaces can be configured independently, enabling redundant network connectivity. Power supply is provided via two independent AC inputs with a voltage of 100 to 240 VAC (50/60 Hz), allowing continuous operation in case of failure of one power source. Power consumption is 130 mA at 110 VAC. The integrated real-time clock (RTC) and watchdog timer (WDT) ensure stable system monitoring, while an acoustic alarm is triggered in case of errors or disturbances.

Compatibility and Accessories

The terminal server supports a wide range of network protocols, including TCP/IP, UDP, DHCP, RIP v1/v2, HTTP, Telnet, and SNMP v1/v2c/v3. Configuration is possible via various interfaces: Web-UI (HTTP/HTTPS), Telnet, serial console, DSU, and Windows tools. Security features include HTTPS, SSH, RADIUS, PAP/CHAP, AES-128/256, and RSA-1024. Certifications include EMV/EMI (EN 55032/35, CISPR 32, FCC Part 15B), EMV immunity (IEC 61000-4-x), safety (UL 62368-1), mechanical durability (Vibration IEC 60068-2-6, Free fall IEC 60068-2-32), and environmental standards (RoHS, CRoHS, WEEE). The MTBF is 370,752 hours according to Telcordia Standard TR/SR.

Mounting and Installation

The device is designed for mounting in 19-inch racks and features mounting ears. The metal housing provides mechanical protection and is designed for industrial environments. Dimensions are 480 x 198 x 45.5 mm (with mounting ears), and weight is 4,284 g. Operating temperature ranges from 0 to 55 °C, and storage temperature is also 0 to 55 °C. Humidity is 5–95 % (non-condensing). Installation is performed via designated mounting points in the rack, with power supply via the two AC inputs.

Advantages in Operation

The combination of Dual-LAN, Dual-AC power input, and galvanic isolation of the serial ports ensures high availability and reliability. Flexible configuration via various interfaces and support for many protocols simplify integration into existing systems. Security features protect against unauthorized access and data manipulation. The integrated real-time clock and watchdog timer enhance system stability. Certifications and high MTBF underscore the quality and longevity of the device. The 5-year manufacturer's warranty provides additional security for operation.