General
Number of serial ports	8
Ethernet isolation	1.5 kV
Data bits	5, 6, 7, 8
Stop bits	1, 1.5, 2
Air humidity	5–95 %
Dual-LAN
Redundant COM
Dual-host support
Watchdog timer

The CN2650I-8 terminal server from Moxa is an industrial network adapter that integrates serial devices into Ethernet networks. It belongs to the CN2600 series and is specifically designed for applications requiring uninterrupted and reliable data transmission. The device features eight serial ports, which depending on model variants support RS-232 or RS-232/422/485, enabling the connection of various industrial peripheral devices such as sensors, controls, or measuring instruments to an IP-based network.

Applications

The CN2650I-8 is suitable for industrial environments where serial communication over Ethernet networks is required. Typical use cases include networking machines in production facilities, integrating legacy devices into modern networks, or remote maintenance of devices in distributed infrastructure. Its robust construction and support for redundancy functions make it particularly suitable for critical applications where downtime must be avoided.

Functions and Equipment in Detail

The device offers two Ethernet interfaces with 10/100BaseT(X) and 1.5 kV isolation, ensuring secure and interference-free data transmission. The serial interfaces support baud rates from 50 bps to 921.6 kbps, data bits from 5 to 8, stop bits of 1, 1.5, or 2, and parity types including None, Even, Odd, Space, and Mark. Operating modes include Real COM, TCP Server/Client, UDP, RFC2217, Terminal, Reverse Telnet, PPP, DRDAS, and Redundant COM, allowing flexible adaptation to various application scenarios.

Technology Explained Simply

The Redundant COM mode ensures that the same serial data is transmitted simultaneously over both LAN connections, increasing communication reliability. In the event of a network connection failure, the other connection continues to transmit data. Dual-Host redundancy allows simultaneous connection to two host systems, so that if one host fails, the other automatically takes over. Dual power supply (available only on AC models) provides additional security in case of power outages. The integrated watchdog timer (WDT) monitors operation and can trigger a restart in case of failure, while the real-time clock (RTC) provides timestamping for events. An acoustic alarm (buzzer) signals error conditions.

Compatibility and Accessories

The terminal server is compatible with operating systems such as Windows, Linux, macOS, Android, and Unix derivatives. Configuration is performed via web interface, Telnet, or a console connection. Serial-to-network integration is achieved using DB9 connectors, suitable for connecting to industrial devices. The devices are designed for mounting in 19-inch racks and feature a robust metal housing.

Mounting and Installation

Installation is carried out in a 19-inch rack using the included mounting kit. Configuration can be performed via the web interface, Telnet, or console connection. The quick installation guide supports the setup process. Power supply is provided via 100–240 VAC or 88–300 VDC (for HV models), with a maximum power consumption of 200 mA.

Operational Advantages

The combination of Dual-LAN, Dual-Host support, and Dual power supply (on AC models) ensures high availability. The MTBF (Mean Time Between Failures) is up to 831,925 hours, indicating high reliability. Support for various protocols and operating modes enables flexible integration into existing networks. Integrated functions such as watchdog timer, real-time clock, and buzzer simplify maintenance and fault diagnosis.

Certifications and Environmental Conditions

The device complies with EMC standards EN 55032 and EN 55024/35, as well as safety standards UL 60950-1 and UL 62368-1. It is also RoHS-, WEEE-, and CRoHS-compliant. Operating temperature ranges from 0–55 °C or -40–85 °C depending on the model, with humidity levels of 5–95 %, non-condensing. The devices are designed for industrial environments and offer high mechanical and electrical stability.

Scope of Delivery

The device is delivered with a rack mounting kit, an RJ45-to-DB9 console cable, one or two network cables (depending on the model), a quick installation guide, and a warranty card. The warranty period is five years.