General
Number of serial ports	4
Data bits	5–8
Stop bits	1/1.5/2
Fibre optic multimode	4–5 km
Wavelength multimode	1300 nm
Switch queues	4
VLAN count	64
Air humidity	5–95 % nicht kondensierend

The Moxa NPort S8455I-SS-SC-T is an industrial Device-Server from the NPort S8000 series, combining the functions of a serial device server with a Managed Ethernet-Switch in a compact metal housing. It is specifically designed for demanding industrial environments where space-saving, high reliability, and network redundancy are important. The device features 4 serial ports (RS-232/422/485) and integrated Ethernet connections, including 3 RJ45 ports and 2 SC fiber ports for multimode and singlemode connections, making it suitable for various applications in industrial networking.

Applications

The NPort S8455I-SS-SC-T is used in industrial automation systems, manufacturing industry, energy sector, and building automation, where legacy devices with serial interfaces need to be connected to modern Ethernet networks. The integrated fiber optics enable transmission over long distances – up to 40 km with singlemode – making it ideal for distributed systems, such as in large production halls or remote monitoring systems. The DIN-rail mounting simplifies installation in enclosures, with optional wall mounting also available.

Functions and Equipment in Detail

The device offers 4 serial DB9 ports supporting RS-232, RS-422, and RS-485. The serial interfaces are equipped with 2 kV isolation, ensuring high immunity to interference and protection against overvoltage. The baud rate can be set between 50 bps and 921.6 kbps, with configurable parity and data bits (5–8 data bits, 1/1.5/2 stop bits). Operating modes include Real COM, RFC2217, TCP Client/Server, UDP, and disabled, providing flexible connectivity options for various network environments. For RS-485, adjustable pull-up/down resistors and a terminator are available to optimize signal quality for different bus topologies.

Technology Explained Simply

The integrated Managed Ethernet-Switch provides 3 RJ45 ports and 2 SC fiber ports, with the fiber ports configurable for multimode (4–5 km) and singlemode (up to 40 km). The wavelengths are 1300 nm (MM) and 1310 nm (SM). The TX power is -10 to -20 dBm (MM) and 0 to -5 dBm (SM), while the RX sensitivity is -32 dBm (MM) and -34 dBm (SM). Network redundancy is ensured by protocols such as Turbo Ring v1/v2, Turbo Chain (< 20 ms), and RSTP/STP, enabling fast recovery of network connections after a failure. Network management is performed via Web-GUI, Telnet, CLI, or a Windows utility, supporting protocols such as SNMP, LLDP, IGMP, VLAN, QoS, LACP, HTTPS, SSH, and RADIUS. Switch functions include 4 priority queues, 64 VLANs, and IGMP support for up to 256 groups, enabling efficient data prioritization and segmentation.

Compatibility and Accessories

The device is designed for use in industrial networks and supports various network protocols. It is equipped with overvoltage protection for serial interfaces, Ethernet, and power supply, increasing robustness in harsh environments. Power supply is via dual inputs with 12–48 VDC, with power consumption at 935 mA at 12 VDC. Connections are made via 2 x 6-pole detachable terminal blocks. Additionally, the device features 2 digital inputs and 2 relay outputs (1 A @ 24 VDC) for alarm applications.

Mounting and Installation

Mounting is standard on the DIN rail, with optional wall mounting also possible. The compact metal housing has dimensions of 73.1 x 134 x 125 mm and weighs 578 g. Installation is simple and quick thanks to the integrated connections and clear structure of the device. The included quick installation guide supports the installation process.

Advantages in Operation

The NPort S8455I-SS-SC-T offers high operational reliability due to integrated redundancy functions and robust construction. The operating temperature ranges from -40 to 75 °C (T models), enabling use in extreme environments. Humidity of 5–95 % (non-condensing) and certifications according to EN 55032/24, CISPR 32, FCC Part 15B, as well as UL 508 and EN 60950-1 ensure safe and reliable operation. The MTBF is up to 287,354 hours (model-dependent), indicating a long service life. The integrated fiber optics enable flexible network architecture over long distances, allowing efficient connection of distributed devices.

Scope of Delivery

The device is delivered with a quick installation guide and a warranty card. The mentioned documents support the installation and maintenance of the device.

Certifications and Environmental Conditions

The device complies with EMC directives EN 55032/24, CISPR 32, and FCC Part 15B. Safety certifications include UL 508, UL 60950-1, and EN 60950-1. It is suitable for use in hazardous areas (C1D2) and meets industrial standards IEC 61000-4-x and IEC 60068-2-x. The operating temperature for T models is between -40 and 75 °C, and the storage temperature is also between -40 and 75 °C. Humidity is 5–95 % (non-condensing).