General
Number of serial ports	16 Stück
SD standard	SD 2.0 -
Data bits	5, 6, 7, 8 -
Stop bits	1, 1.5, 2 -
Air humidity	5–95 % (nicht kondensierend)
MTBF	439.673 Stunden

The Moxa NPort 6650-16-T is an industrial-grade terminal server with 16 serial ports, designed to securely integrate RS-232/422/485 devices into an Ethernet network. The device is designed for use in harsh environments and is particularly suitable for automation systems, SCADA applications, and telecommunications infrastructures, where stable and secure communication between legacy serial devices and modern networks is required. Integrated security features such as SSH, HTTPS, and SNMPv3 ensure protected data access, while modular expandability via NM-series modules enables adaptation to different network conditions.

Applications
This terminal server is designed for industrial applications requiring high reliability and operational safety. It is commonly used in production facilities, power supply networks, transportation systems, and monitoring installations, where serial devices such as sensors, controls, or printers must be accessed via Ethernet. The wide operating temperature range of -40 to 75 °C makes it suitable for outdoor use or rooms with extreme climatic conditions. The power supply via 100–240 VAC ensures compatibility with various power grids.

Functions and Equipment in Detail
The device features 16 serial interfaces, each connected via 8-pin RJ45 connectors. Supported standards include RS-232, RS-422, and RS-485, with automatic data direction control (ADDC). Baud rates can be set between 50 bps and 921.6 kbps, including non-standard values. Configuration is possible via a web console (HTTP/HTTPS), Windows utility, DSU, MCC Tool, serial, Telnet, or SSH. The integrated real-time clock (RTC) and watchdog timer enhance system stability.

Technology Explained Simply
The serial ports enable connection of devices communicating via classic serial interfaces, translating these signals into Ethernet protocols. The integrated magnetic isolation of 1.5 kV protects the device against voltage surges and electrical interference. The Ethernet interface supports 10/100BaseT(X) with Auto MDI/MDI-X, enabling flexible cabling without additional crossover connections. The SD card slot (up to 32 GB, compatible with SD 2.0) is used for storing configurations, logs, or firmware updates.

Compatibility and Accessories
The terminal server is compatible with a wide range of operating systems, including Windows (95 to 11, Server 2003 to 2022, Embedded CE, XP Embedded), Linux (kernel 2.4.x to 6.x), macOS (10.12 to 11.x), as well as other systems such as SCO UNIX, Solaris, QNX, FreeBSD, AIX, HP-UX, ARM platforms (Linux kernel 4.x/5.x), VMware (ESXi, Fusion, Parallels), and Android (from 3.1.x). Expandability via NM-series modules (RJ45/Fiber) allows adaptation to different network conditions, e.g., when using fiber optic cables.

Mounting and Installation
The device is designed for rack mounting and features a metal housing. Dimensions are 480 × 195 × 44 mm (with bracket) or 440 × 195 × 44 mm (without bracket). Installation is carried out using the provided mounting brackets in a 19-inch rack. Power supply is via 100–240 VAC, 47–63 Hz, with power consumption of 192 mA at 100 VAC.

Operational Advantages
The NPort 6650-16-T offers high operational reliability through integrated security features such as authentication via local database, RADIUS, or TACACS+, and encryption using HTTPS (TLS 1.2), AES-128/256, HMAC, RSA-1024, and SHA-1/256/384. Support for protocols such as SNMPv3, DHCP, DNS, LLDP, PPPOE, SMTP, RIPV1/V2, and static routes enables flexible network configuration. The MTBF is 439,673 hours according to Telcordia standard, highlighting high reliability. 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), Transportation (NEMA TS2), and mechanical stress (Vibration, Drop). Environmental declarations include RoHS, CRoHS, and WEEE. The warranty is 5 years.

Security Features
The integrated security features include authentication via local database, RADIUS, or TACACS+, encryption via HTTPS (TLS 1.2), AES-128/256, HMAC, RSA-1024, SHA-1/256/384, and protocols such as SNMPv3 and SSHv2. The alarm output capacity is 1 A at 24 VDC (resistive load), enabling control of external warning systems. An integrated buzzer serves as an audible alarm.

Reliability and Environmental Conditions
The device is designed for operating temperatures from -40 to 75 °C, making it suitable for extreme environments. Humidity is 5–95 % (non-condensing). Storage is also within the range of -40 to 75 °C. Mechanical stress resistance is certified according to IEC 60068-2-6 (Vibration) and IEC 60068-2-34 (Drop). The MTBF is 439,673 hours according to Telcordia standard.

Certifications and Environment
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), Transportation (NEMA TS2), and mechanical stress (Vibration, Drop). Environmental declarations include RoHS, CRoHS, and WEEE. The warranty is 5 years.

Configuration and Management
Configuration is performed via a web console (HTTP/HTTPS), Windows utility, DSU, MCC Tool, serial, Telnet, or SSH. Supported protocols include ARP, BOOTP, DHCP, DNS, HTTP, ICMP, IPv4/IPv6, LLDP, PPPOE, SMTP, SNMPv1/v2c/v3, SNTP, TCP/IP, Telnet, UDP. Routing is done via RIPV1/V2 and static routes. Time synchronization is handled via SNTP client. MIB support includes MIB-II.

Serial Interfaces and Signals
The serial interfaces support RS-232 (TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND), RS-422 (Tx±, Rx±, GND), RS-485-4w (Tx±, Rx±, GND), and RS-485-2w (Data±, GND). Data direction control is automatic (ADDC). The console port interface is RS-232 (TxD, RxD, GND) via 8-pin RJ45, with a default configuration of 19200 8N1.

Power Supply and Operation
Power supply is via 100–240 VAC, 47–63 Hz. Input current is 192 mA at 100 VAC. Operating temperature is between -40 and 75 °C, humidity between 5 and 95 % (non-condensing). Storage is also within the range of -40 to 75 °C.

Mechanical Properties
The housing is made of metal and designed for rack mounting. Dimensions are 480 × 195 × 44 mm (with bracket) or 440 × 195 × 44 mm (without bracket). Weight is 3,580 g.

Reliability and Warranty
The integrated watchdog timer and alarm functions (buzzer, RTC) enhance system stability. The MTBF is 439,673 hours according to Telcordia standard. The warranty is 5 years.