General
Number of serial interfaces	8
Data bits	5, 6, 7, 8
Stop bits	1, 1.5, 2
RS-485 Pull High/Low	1 kΩ, 150 kΩ
Magnetic isolation	1,5 kV
Air humidity	5–95 % (nicht kondensierend)

The Moxa NPort 5650-8-M-SC is a Device-Server of the NPort 5600 series, specifically designed for integrating serial devices into Ethernet networks. The device features eight serial interfaces supporting RS-232, RS-422 and RS-485, enabling communication with a wide range of industrial peripheral devices such as sensors, controls or measuring instruments. Rack mounting in 19-inch standard allows flexible integration into existing network infrastructures. An integrated SC connector for multimode fiber optic provides interference-resistant data transmission over long distances, particularly in environments with high electromagnetic interference, which is typical for industrial applications.

Applications

The NPort 5650-8-M-SC is suitable for industrial networks where serial devices need to be connected via Ethernet. This includes applications in manufacturing automation, power supply, transportation technology or process industry. The fiber optic connection ensures reliable data transmission, even over several kilometers, without impairment from electromagnetic interference. The high EMC immunity and certification according to EN 55032/35 as well as IEC 61000-4-2 to -4-11 make the device suitable for critical applications.

Functions and equipment in detail

The device features eight 8-pin RJ45 ports for the serial interface, which can be configured as RS-232, RS-422 or RS-485 depending on requirements. Baud rates range from 50 to 921,600 bps, allowing flexible adaptation to different devices. Data transmission can be configured with 5, 6, 7 or 8 data bits, 1, 1.5 or 2 stop bits, and parity types such as None, Even, Odd, Space or Mark. Flow control mechanisms such as RTS/CTS, DTR/DSR and XON/XOFF are also supported. For RS-485 applications, pull-up/down resistors (1 kΩ, 150 kΩ) and a 120 Ω terminator are integrated, with data direction control automatically handled via ADDC.

Technology explained simply

The Ethernet interface includes an RJ45 connector for 10/100BaseT(X) and an SC multimode fiber optic connector, providing magnetic isolation of 1.5 kV. This isolation protects the device and connected devices from voltage surges and potential differences. Configuration is performed via a web console (HTTP/HTTPS), a Telnet console, or a Windows utility software. Network management functions include protocols such as SNMPv1/v2c, DHCP, DNS, ICMP, TCP/IP and LLDP. For time synchronization, SNTP is integrated. Security functions include authentication via a local database, encryption with AES-128, RSA-1024, SHA-1 and SHA-256, as well as HTTPS (TLS 1.2) and SNMPv3.

Compatibility and accessories

The device is compatible with operating systems such as Windows 95 to 11, Server 2003 to 2022, Linux kernel 2.4.x to 6.x, macOS 10.12 to 10.15 and 11.x, as well as Android API from 3.1.x. It can also be operated in virtual environments such as VMware ESXi, Fusion and Parallels. The serial interfaces support signals TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND (RS-232), Tx+/-, Rx+/-, GND (RS-422), Tx+/-, Rx+/-, GND (RS-485-4w), and Data+/-, GND (RS-485-2w).

Mounting and installation

The NPort 5650-8-M-SC is designed for 19-inch rack mounting. Dimensions are 480 x 45 x 198 mm (with mounting ears) or 440 x 45 x 198 mm (without ears). The housing is made of metal and provides mechanical protection. Power supply is 100–240 VAC at 47–63 Hz, with power consumption of 174 mA at 100 VAC. The user interface includes an LCD display and control buttons for local operation.

Advantages in operation

The device is characterized by high reliability, with an integrated watchdog timer for error detection and handling. The MTBF is 738,291 hours according to MIL-HDBK-217F. Operating temperature ranges from 0 to 60 °C, storage temperature from -20 to 70 °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 to -4-11), Safety (UL 62368-1), and Medical (EN 55011:2007+A2:2007 Class A, EN 60601-1-2:2007). Warranty is 5 years.