General
Number of serial ports	8
Data buffer per port	64 KB
Air humidity	5–95 % (nicht kondensierend)
IPv4/IPv6

The Moxa NPort 6650-8 is a Device-Server for industrial applications, enabling the connection of serial devices to an Ethernet network. It features 8 serial ports, configurable for RS-232, RS-422 or RS-485 (2- and 4-wire). These interfaces are implemented via 8-pin RJ45 connectors, allowing compact and standardized cabling in industrial environments. The server acts as a bridge between legacy devices with serial interfaces and modern network infrastructures, facilitating integration into existing IT systems.

Applications
The NPort 6650-8 is suitable for applications in industrial automation, building automation, energy technology, and transportation, where serial devices such as sensors, controllers, printers, or measuring instruments need to be integrated into a network. The high port density and support for various serial standards make it particularly suitable for systems with multiple serial end devices. Integration into Ethernet networks also enables centralized monitoring and control via network protocols.

Functions and Features in Detail
The server supports a variety of communication modes, including Real COM, TCP/UDP Server/Client, Pair Connection, Terminal Mode, and Reverse SSH/Telnet. This allows flexible use, whether for emulating a serial port on a computer (Real COM) or for direct network connections. Support for non-standard baud rates from 50 bps to 921.6 kbps ensures compatibility with a wide range of serial devices, including those with unusual transmission rates. Serial data communication is protected by TLS 1.2, SSHv2, and AES-128/256 encryption, ensuring data transmission security in sensitive environments. Authentication is performed via local database, RADIUS, or TACACS+, enabling centralized user management.

Technology Explained Simply
The serial ports are equipped with a local buffer of 64 KB per port, ensuring that data is not lost even if the Ethernet connection fails. Once the network connection is restored, stored data is transmitted without loss. This is particularly important in environments with unstable network conditions. The network connection is made via a 10/100BaseT(X) RJ45 connector with 1.5 kV isolation, providing high electrical safety. Support for IPv4 and IPv6, as well as protocols such as TCP/IP, UDP, SNMP, DHCP, DNS, HTTP/S, and LLDP, enables flexible integration into existing networks. Configuration is performed via a web-based interface or an integrated LCD display (on standard temperature models), making IP address and other parameter settings simple and direct at the device.

Compatibility and Accessories
The NPort 6650-8 is compatible with a wide range of operating systems, including Windows (95 to 11), Windows Server (2003 to 2022), Linux (2.4 to 6.x), macOS (10.12 to 11.x), Android, and various UNIX derivatives. Driver support includes Real COM, Virtual COM, and Fixed TTY, enabling use in various environments. Integration into virtualization platforms such as VMware, Parallels, and Fusion is also possible. APIs are available from Android 3.1 for application development and control. Ethernet redundancy can be achieved via STP/RSTP/Turbo Ring, requiring an additional NM module.

Mounting and Installation
The device is housed in a metal enclosure and designed for rack mounting. Installation is performed using the designated mounting points in the rack. Power supply is via 100 to 240 VAC, with a current consumption of 285 mA at 100 VAC. Operating temperature ranges from 0 to 55 °C, and storage temperature from -40 to 75 °C. Humidity is 5–95 % (non-condensing).

Operational Advantages
Operation of the NPort 6650-8 is particularly reliable due to integrated data buffering and robust encryption. Support for modern security protocols such as TLS 1.2 and SSHv2, along with compliance with IEC 62443, meets requirements for industrial network security. The web-based configuration and LCD display (on standard models) simplify commissioning. High port density and flexible configuration make the device an efficient solution for integrating serial devices into industrial networks.

Certifications
The device meets EMC requirements according to EN 55032/35, CISPR 32, and FCC Class A. EMS certification is according to IEC 61000-4-2 to -4-11. Safety certification is according to UL 60950-1, and transportation certification according to NEMA TS2. Environmental certifications include RoHS, CRoHS, and WEEE. The MTBF is 68,707 hours according to Telcordia Standard.

Scope of Delivery
The scope of delivery includes the NPort 6650-8 Device-Server, two rack mounting brackets, a DB9 plug to RJ45 cable, a region-specific power cable, a quick start guide, and a warranty card.