The Moxa NPort S8455I-MM-SC-T is an industrial Device-Server from the NPort S8000 series, combining four serial interfaces with RS-232/422/485 support and an integrated, fully manageable Ethernet-Switch in a compact metal housing. The device is designed for use in industrial environments where a reliable connection between serial devices and an Ethernet network is required. The combination of device server and switch reduces space requirements and installation effort, as multiple functions are consolidated into a single module.

Applications
The NPort S8455I-MM-SC-T is suitable for applications in industrial automation, such as in production facilities, energy supply, building technology, or transportation. It enables the integration of older, serially connected devices such as sensors, controls, or measuring instruments into modern Ethernet-based networks. The fiber optic ports (2 x 100BaseFX SC multimode) provide a robust, interference-free transmission over long distances, especially in environments with electromagnetic interference. The DIN rail mounting simplifies installation in enclosures.

Functions and Features in Detail
The device features four serial ports with DB9 connectors, supporting RS-232, RS-422, or RS-485 depending on configuration. The baud rate can be set between 50 bps and 921.6 kbps. The serial signals are galvanically isolated (2 kV isolation), ensuring high immunity to interference and protection against voltage surges. Configuration of the serial interfaces is done via DIP switches. For RS-485, a configurable pull-up/pull-down resistor is available to optimize signal quality. The serial ports are equipped with overvoltage protection.

Technology Explained Simply
The integrated Ethernet switch provides two fiber optic ports (100BaseFX SC multimode) and three RJ45 ports (10/100BaseT(X)), enabling a total of five network connections. Network connectivity can be secured using redundant protocols such as Turbo Ring, Turbo Chain (recovery in <20 ms), and RSTP/STP (IEEE 802.1w/D) to minimize network outages. Management is performed via HTTP(S), Telnet, SNMPv1/v2c/v3, and RMON. Features such as VLAN, QoS, and IGMP Snooping support structured network organization. Support for 802.1Q and 802.1X enables network segmentation and authentication implementation.

Compatibility and Accessories
The NPort S8455I-MM-SC-T is designed for use with serial devices communicating via RS-232, RS-422, or RS-485. The integrated fiber optic ports are designed for multimode fiber optic cables and enable connections over long distances. The RJ45 ports are suitable for standard Ethernet cables (Cat5e or higher). Power supply is via 12 to 48 VDC, with redundant power input possible through two removable 6-pin terminal blocks. The devices are designed for industrial environments and comply with standards EN 55032/24, CISPR 32, FCC Class A, as well as IEC 61000-4-x for EMC/EMI and EMS. Safety certifications include UL 508, EN 60950-1, and Class I Division 2 (C1D2).

Mounting and Installation
The device is installed in enclosures using DIN rail mounting. Installation is done by simply clipping it onto the rail. Power supply is connected via the terminal blocks, which are designed for redundant power input. Serial devices are connected via DB9 connectors, and network connections via RJ45 or fiber optic cables. Configuration is performed via the integrated web interface, Telnet, or SNMP. The quick installation guide included in the delivery supports setup.

Operational Advantages
The NPort S8455I-MM-SC-T offers high operational reliability through galvanic isolation, overvoltage protection, and redundant network protocols. The integrated management functions enable centralized network control. The operating temperature range for the T model is from -40 to 75 °C, enabling use in extreme environments. The MTBF is up to 287,354 hours, indicating high reliability. The digital input and relay output functions (2 channels each) extend functionality for alarm and control tasks.

Scope of Delivery
The scope of delivery includes the NPort S8000 device server, a quick installation guide, and a warranty card.