Moxa NPort S8455I-MM-SC, 4-Port Device Server RS232/422/485 content_copy

The Moxa NPort S8455I-MM-SC is a combined industrial device server integrating a full-featured Ethernet switch with a 4-port serial device server. This all-in-one design is intended for industrial automation applications requiring simultaneous serial communication and Ethernet network connectivity. The combination reduces space requirements, power consumption, and investment costs compared to separate devices. The device features four serial ports with RS-232/422/485 interfaces, connected via DB9 connectors. The baud rate can be set between 50 bps and 921.6 kbps, with galvanic isolation up to 2 kV. The serial ports support various operating modes, including Real COM, RFC2217, TCP Client/Server, UDP, and disabled. Signals include full coverage for RS-232 (TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND) as well as RS-422/RS-485. Configuration is done via DIP switches, with configurable pull-up/pull-down resistors and a 120-Ohm termination for RS-485 available.

Applications

The NPort S8455I-MM-SC is suitable for industrial environments where legacy devices with serial interfaces need to be connected to a modern Ethernet network. Typical applications include machine controls, sensors, printers, air conditioning systems, or other devices communicating via RS-232/422/485. The integrated network functionality enables remote control and monitoring of these devices via IP-based protocols. The robust construction with metal housing and DIN rail mounting makes the device suitable for use in production halls, factories, or other industrial environments.

Functions and Equipment in Detail

The device features an integrated managed 5-port Ethernet switch, consisting of three copper ports (10/100BaseT(X)) and two fiber ports (100BaseFX). The fiber ports are equipped with SC connectors and support multimode fiber, suitable for short to medium transmission distances in industrial networks. Network functions include support for Turbo Ring, Turbo Chain, and RSTP/STP redundancy protocols, enabling recovery times of under 20 ms. This ensures high network availability in case of failures. VLAN functionality allows setting up to 64 VLANs with VID 1–4094, enabling efficient network segmentation. IGMP groups are limited to 256, and QoS is implemented via four priority queues to prioritize critical data streams. Management functions include SNMPv1/v2c/v3, HTTP(S), Telnet, RMON, DHCP, LLDP, and Port Mirroring, enabling comprehensive network monitoring and control.

Technology Explained Simply

The integrated Serial QoS function ensures that serial data streams are prioritized in the network, which is especially important when transmitting time-critical control signals. The galvanic isolation of 2 kV protects internal circuits from voltage surges and electrical interference, increasing reliability in industrial environments. The digital input/output function provides two digital inputs (13–30 V High, max. 8 mA) and two alarm relays (1 A @ 24 VDC), which can be used for status monitoring or alarm functions. Power supply is via 12–48 VDC, with power consumption at 12 VDC being 935 mA. Connections are made via two 6-pole removable terminal blocks, enabling flexible and secure wiring.

Compatibility and Accessories

The device is designed for use in industrial Ethernet networks and is compatible with standard protocols such as TCP/IP, UDP, RFC2217, and SNMP. The fiber ports support multimode fiber with SC connectors, enabling connection to other fiber network devices. The serial ports are universally usable for RS-232/422/485 devices. Configuration is done via DIP switches, allowing simple, factory-based setup without additional software. The devices are designed for industrial environments and comply with standards EN 55032/24, IEC 61000-x, UL 508, EN 60950-1, C1D2, and IEC 60068 (shock/vibration).

Mounting and Installation

The device is delivered in a robust metal housing with IP30 protection rating. Dimensions are 73.1 x 134 x 125 mm, and weight is 578 g. Mounting is standard on a DIN rail, with wall mounting optionally available. Installation requires connecting serial devices via DB9 connectors and connecting to the Ethernet network via copper or fiber ports. Power supply is via terminal blocks with 12–48 VDC. Configuration can be done via DIP switches or via network management protocols (such as SNMP, HTTP(S), Telnet).

Operational Advantages

The NPort S8455I-MM-SC offers a compact, reliable, and cost-efficient solution for integrating serial devices into industrial Ethernet networks. The integrated switch functionality reduces the number of required devices and simplifies network architecture. Support for redundancy protocols such as Turbo Ring and RSTP/STP ensures high network availability. Galvanic isolation and robust construction increase the device’s lifespan and reliability in demanding industrial environments. Operating temperature ranges from -40 to 75 °C (T models), enabling broad applicability in different climatic conditions. The MTBF is up to 287,354 hours, indicating high operational reliability.

Scope of Delivery

The device is delivered with a quick installation guide and a warranty card. It is a single unit of the NPort S8000 series, intended for direct use in industrial networks.