General
Number of serial ports	8
Data bits	5, 6, 7, 8
Stop bits	1, 1.5, 2
RS-485 resistors	1 kΩ / 150 kΩ
RS-485 terminator	120 Ω
Ethernet ports	2
IGMP filter	v1/v2
Number of inputs	2
Dimensions with mounting bracket	229 × 46 × 125 mm
Air humidity	5–95 % (nicht kondensierend)
Reverse polarity protection

The Moxa NPort 5650I-8-DT is a compact 8-port device server that enables serial RS-232/422/485 communication over an Ethernet network. It is designed for desktop use, but its robust metal construction and versatile mounting options also make it suitable for industrial or medical environments. The galvanic isolation with 2 kV optical separation ensures signal stability and electrical safety, making it particularly suitable for critical applications. The integrated watchdog timer and alarm functions such as buzzer and RTC enhance operational reliability and enable quick response to fault conditions.

Applications
This device server is suitable for applications where serial devices such as measuring instruments, controls, sensors or medical equipment need to be integrated into an IP-based network. Support for a wide range of operating systems, including Windows, Linux, macOS, various Unix variants, ARM platforms and virtual machines, expands its application possibilities. Mounting options for desktop, DIN rail (optional) and wall (optional) allow flexible installation in different environments.

Functions and Features in Detail
The NPort 5650I-8-DT features eight serial ports with DB9 connectors supporting RS-232, RS-422 and RS-485 standards. Baud rates can be set between 50 bps and 921.6 kbps, with configurable data bits (5–8), stop bits (1, 1.5, 2) and parity types (none, even, odd, Space, Mark). Flow control is achieved via RTS/CTS, DTR/DSR or XON/XOFF. For RS-485 applications, resistors of 1 kΩ and 150 kΩ as well as a 120 Ω terminator are provided. Direction control is automatic via ADDC. The serial interface features optical isolation of 2 kV and surge protection of 0.5 kV. A separate console port with RS-232 interface (TxD, RxD, GND) in 3-pin configuration allows local configuration at a baud rate of 19200 8N1.

Technology Explained Simply
Serial signals are transmitted via the DB9 connectors, with signals defined differently depending on the standard (RS-232, RS-422, RS-485). The Ethernet interface provides two 10/100BaseT(X) RJ45 ports equipped with integrated magnetic isolation of 1.5 kV. This protects the device from interference and enables redundant network connections. Configuration can be performed via various methods: serial, Telnet, Web (HTTP/HTTPS) or using a Windows utility software. The user interface consists of an LCD display and buttons, enabling intuitive operation. The software supports numerous network protocols including ARP, BOOTP, DHCP, DNS, ICMP, IPv4, LLDP, Rtelnet, SMTP, SNMPv1/v2c, TCP/IP, Telnet, UDP, as well as IGMP v1/v2 filters and SNTP time management. MIB support includes RFC1213 and RFC1317.

Compatibility and Accessories
The device server is compatible with a wide range of operating systems, including Windows 95 to 11, Server 2003 to 2022, Embedded CE 6.0/5.0, XP Embedded, Linux kernel 2.4.x to 6.x, macOS 10.12 to 11.x, SCO UNIX, OpenServer, UnixWare 7, Solaris 10, QNX 4.25/6.x, FreeBSD, AIX 5.x, HP-UX 11i, Mac OS X, ARM platforms (kernel 4.x/5.x), VMware ESXi, Fusion, Parallels (macOS up to 11.x) and Android API from version 3.1.x. Driver support ensures seamless integration into existing system environments.

Mounting and Installation
Mounting is standard for desktop use. Optional DIN rail and wall mounting brackets can be used to secure the device in enclosures or on walls. Dimensions are 197 × 44 × 125 mm (without bracket), 229 × 46 × 125 mm (with bracket) and 197 × 53 × 125 mm (with DIN rail). Weight is 1,660 g. Power supply is via an input range of 12 to 48 VDC, with current consumption of 1066 mA at 12 VDC. Connections are made via screw terminals (TB) and a power socket. Reverse polarity protection is integrated.

Operational Advantages
The NPort 5650I-8-DT offers high reliability with an MTBF of 836,374 hours according to Telcordia (Bellcore) standard. Security features include authentication via a local database, encryption with HTTPS, AES-128, RSA-1024, SHA-1/256, as well as support for HTTPS (TLS 1.2) and SNMPv3. Operating temperature ranges from 0 to 55 °C, storage temperature from -40 to 75 °C. Humidity is 5–95 % (non-condensing). Certifications include EMC (EN 55032/35), EMI (CISPR 32, FCC Part 15B Class A), EMS (IEC 61000-4-2/-3/-4/-5/-6/-8/-11), safety (UL 60950-1, IEC 62368-1) and environmental standards (RoHS, CRoHS, WEEE). Warranty is 5 years.