General
Number of serial ports	16
Data bits	5, 6, 7, 8
Stop bits	1, 1.5, 2
Parity	N, E, O, M, S
Insulation	1.5 kV
Auto-MDI/MDI-X
IPv4/IPv6
HTTPS
DHCP
LLDP

The Moxa NPort 6650-16 is an industrial device server that connects up to 16 serial devices via RS-232/422/485 interfaces to an Ethernet network. It serves as a bridge between legacy serial devices and modern IP-based networks, enabling integration into existing IT infrastructures. The device is designed for use in demanding industrial environments where reliability, security, and flexibility of communication are critical. The series supports various serial standards and offers comprehensive security features that ensure the protection of sensitive data and the integrity of network communication.

Applications

The NPort 6650-16 is suitable for applications where serial devices such as sensors, controls, measuring instruments, or industrial machines need to be integrated into an IP network. Typical use cases include remote monitoring, data acquisition in production facilities, machine control in manufacturing, and networking of legacy systems in Smart-Factory environments. Support for IPv6 and VLAN enables flexible network integration, even in large, heterogeneous environments.

Functions and Features in Detail

The device features 16 serial ports that can be individually configured between RS-232, RS-422, and RS-485. Data rates range from 50 bps to 921.6 kbps, including non-standard values. The serial signals include RS-232, RS-422, RS-485-4w, and RS-485-2w. Configuration of data bits (5, 6, 7, 8), stop bits (1, 1.5, 2), and parity types (N, E, O, M, S) is flexible per port. Flow control mechanisms such as RTS/CTS, DTR/DSR, and XON/XOFF are also integrated. An integrated 64-KB port buffer stores serial data during connection interruptions and ensures reliable resumption of transmission after network connection restoration.

Technology Explained Simply

The NPort 6650-16 operates as a terminal server that converts serial data into IP packets and transmits them over the network. The network interface consists of an RJ45 connector with 10/100BaseT(X) support and Auto-MDI/MDI-X function. Isolation is 1.5 kV, ensuring high electrical safety. Ethernet redundancy functions such as STP, RSTP, and Turbo Ring ensure stable network connections even during failures. Support for IPv4 and IPv6 enables use in modern networks. Protocols such as SNMPv3, HTTPS, Telnet, DHCP, and LLDP support network management and diagnostics.

Compatibility and Accessories

The terminal server is compatible with various operating systems, including Windows, Linux, macOS, Unix, Android, and virtualization environments (VMs). Security features include authentication via local users, RADIUS, and TACACS+, as well as encryption using HTTPS, AES-128/256, HMAC, RSA, and SHA. Operating modes include Secure Real COM, TCP/UDP, SSH, and Reverse Telnet/SSH. Optional NM-Fiber modules can be used for fiber optic connections to increase network reach and immunity to interference. An SD card slot (SD 2.0) allows storage expansion up to 32 GB, useful for logging, firmware updates, or additional configurations.

Mounting and Installation

The device features a metal housing and is designed for rack mounting. Dimensions are 440 x 195 x 44 mm. Mounting is done using included rack brackets. Power supply is via 100–240 VAC or -48 VDC / 110 VDC, with the appropriate power supply unit or power cable included in the delivery. IP configuration can be performed directly on the device via an integrated LCD display, simplifying installation. Configuration is done via a web interface, Telnet, SSH, or using the Moxa management software.

Operational Advantages

The NPort 6650-16 offers high operational reliability thanks to integrated security features and robust hardware. Support for Ethernet redundancy and the 64-KB port buffer ensure reliable data transmission even under challenging conditions. Compatibility with various operating systems and virtualization environments enables flexible use. Certification according to IEC 62443, UL 60950-1, and NEMA TS2 confirms suitability for industrial applications. Operating temperature ranges from -40 to +85 °C, enabling use in extreme environments. Humidity tolerance of 5–95 % (non-condensing) demonstrates the device’s high environmental resistance.

Certifications and Standards

The device meets EMC requirements according to IEC 61000, FCC, and EN 55032/35. Safety certification is according to UL 60950-1 and IEC 60068-2 (vibration/fall). Environmental compliance is ensured by RoHS and WEEE. The MTBF is up to 850,000 hours, highlighting the device’s high reliability. Certification according to IEC 62443 ensures security in industrial networks.

Delivery Contents

Included in the delivery: 1 x NPort 6650-16 terminal server, 2 x rack brackets, 1 x DB9 to RJ45 cable, 1 x power supply unit or power cable (model-dependent), 1 x quick start guide, and 1 x warranty card.