NPort S8455/S8458 Series

Combo switch / serial device servers

Logo UL listedLogotype CE certifikatLogotyp FCC certifikat


Features and Benefits

› 4-port RS-232/422/485 serial device server
› Serial QoS for configuring serial data transmission priority
› 2 KV (DC) isolation protection for each serial port (NPort S8455i only)
› Adjustable pull high/low resistor for RS-485 ports (NPort S8455i only)

› Built-in managed Ethernet switch
› S8455i fiber models: Two fiber Ethernet ports and three Ethernet ports
› S8455i all copper models: Five Ethernet ports
› S8458: Four fiber Ethernet ports and four Ethernet ports
› Ethernet redundancy with Turbo Ring and Turbo Chain (recovery time < 20 ms) or RSTP/STP (IEEE 802.1w/D) supported
› QoS, IGMP-snooping/GMRP, VLAN, LACP, SNMPv1/v2c/v3, RMON supported
› Surge protection for serial, power, and Ethernet


The NPort S8455/S8458 series combines an industrial device server with a full-function managed Ethernet switch by integrating a combination of fiber and Ethernet ports with 4 RS-232/422/485 serial ports, allowing you to easily install, manage, and maintain the product. Combining a device server and switch in one product allows you to save space in your cabinet, reduce overall power consumption, and reduce costs, since you will not need to purchase a switch and serial device server separately.

Supports the Full Range of NPort 5000 Series Device Server Functions
The NPort S8455/S8458 series supports the complete array of NPort 5000 series device server functions. You can network your existing serial devices by connecting up to 4 serial devices through Ethernet ports, with only basic configuration required. In addition, data transmission between the serial and Ethernet interfaces is bi-directional.

Full-function Managed Ethernet Switch
The NPort S8455/S8458 series has a built-in full-function managed Ethernet switch that supports QoS, IGMP-snooping/GMRP, VLAN, Port Trunking, SNMPv1/v2c/v3, and IEEE 802.1X, allowing you to handle virtually any kind of application. Ethernet redundancy, which is used to increase the reliability and availability of your industrial Ethernet network, is provided by Moxa’s Turbo Ring and Turbo Chain technology (recovery time < 20 ms) or RSTP/STP (IEEE 802.1w/D).

Ring Redundancy at the Device Level
Device level communication networks for industrial automation are very critical since they are used to control and monitor device processes. The reliability of these communications depends on ring redundancy at the device level. which is designed to provide fast network fault detection and reconfiguration in order to support the most demanding control applications. The NPort S8455/S8458 series integrates a full function NPort device server with an industrial switch to carry serial and Ethernet devices at the same time. In addition, the NPort S8455/S8458 can also achieve ring redundancy with standard STP/RSTP and Moxa’s proprietary Turbo Ring or Turbo Chain 2 redundancy protocols. This all-in-one design can be used to optimize and simplify your device network, and enhance reliability.

Couple Several Turbo Rings for Distributed Applications 

For some systems, it may not be convenient to connect all devices in the system to create one BIG redundant ring, since some devices could be located at a remote site. The NPort S8455I-MM-SC supports Turbo Ring’s ”Ring Coupling” function, which allows you to separate distributed devices into different smaller redundant rings, without a control line, and in such a way that the smaller rings will still be able to communicate with each other.


Rugged Design with Complete Protection 

1. UL508 safety 
To meet customers’critical application requirements, the NPort S8455/S8458 series has been certified to meet the UL 508 national and international standard. The UL 508 standard covers the safety requirements for industrial control equipment.
2. 3-way surge protection 
The NPort S8455/S8458 series is equipped with a surge protector for power, Ethernet interface, and serial interface for protection against voltage spikes.
3. Level 4 ESD 
The NPort S8455/S8458 series supports high level, 8/15 KV, ESD protection to avoid damage from static electricity.
4. 2 KV Serial Isolation (NPort S8455 only)
Each serial port is protected by 2 KV of isolation against harmful currents from high voltages caused by a difference in ground potential between points in a communications system.


Foto med beskrivning av delarna i Moxas kombinerade switch och serieportserver


Typical Applications could be:

Roadway Traffic Monitoring and Control
Intelligent transportation systems (ITS) are playing a major role in modern transportation construction, with ITS technology applied to roadway traffic control systems. In general, ITS involves integrating communication, control, and electronics technologies, and is used to monitor and manage traffic flow, reduce congestion, provide alternative routes to travelers, and enhance productivity to save lives,time, and money. Traffic monitoring and control systems are usually housed in a small cabinet located by the roadside or at an intersection.
Such systems usually include a camera for monitoring traffic, a traffic light control system, as well as other devices. The NPort S8455I-MMSC is the best choice for traffic monitoring and control applications, since the compact size and all-in-one switch/device-server design saves a significant amount of space in a small cabinet.


Solar Power Station 
All solar power stations include three major devices—a power inverter, a PLC, and meters. The power inverter converts the energy generated by the plant into the power that is transmitted to end-users.
The PLC controls the sun tracking system of the base. These devices are often serial devices, although some may be Ethernet-ready. Now you can connect all of these Ethernet and serial devices to the control center easily and economically with one With the NPort® S8455I-MMSC. The Ethernet redundancy function and ring structure increase the reliability and availability of the system. The NPort® S8000 series is definitely the best solution for this type of solar power system.

Read more in the whitepaper ”Five key requriments of Railway Backbone networks” (pdf) Whitetpaper 5 key requirements Railway Trackside
Read more in the Whitepaper ”The Advantages of RS-485 Data Direction Control” (pdf)

• Port Summary
Serial Ports
4 RS-232/422/485 ports

Ethernet Switch Ports

• NPort S8455: 3 RJ45 copper ports and 2 multi-mode fiber ports

• NPort S8458: 4 RJ45 Copper ports and 4 multi-mode fiber ports

Console Ports
1 (8-pin RJ45 connector)
• Physical Characteristics

NPort S8455: 578 g

NPort S8458: 1,105 g


• NPort S8455: 73.1 x 134 x 125 mm 

• NPort S8458: 93 x 144 x 125 mm

• Environmental Limits
Operating Temperature
Standard Models: 0 to 60°C
Wide Temp. Models:
• NPort S8455-T: -40 to +75°C

• NPort S8458-T: -40 to +85°C

Ambient Relative Humidity
5 to 95% (non-condensing)
Altitude Up to 2000 m Note: Please contact Moxa if you require products guaranteed to function properly at higher altitudes.
Storage Temperature
-40 to 85°C (-40 to 185°F)
• Power Requirements
Input Voltage
12 to 48 VDC
Power Consumption

• NPort S8455: 935 mA @ 12 V, 470 mA @ 24 V

• NPort S8458: 940 mA @ 12 V, 470 mA @ 24 V

• Regulatory Approvals
EN 55032/24 (CE, FCC)
EN 60950-1, IEC 60950, UL 508, UL 60950-1 
EN 55022 Class A, FCC Part 15 Subpart B Class A
Hazardous Locations
NPort S8455i Series: Class 1 Div 2
IEC 60068-2-6
Enviromential Testing

IEC 60068-2-1
Shock >IEC 60068-2-27

NPort S8455I Series:
IEC 61000-4-2 ESD: Contact: 6 kV; Air: 8 kV
IEC 61000-4-3 RS: 80 MHz to 1 GHz: 10 V/m
IEC 61000-4-4 EFT: Signal: 1 kV
IEC 61000-4-5 Surge: Power: 1 kV; Signal: 0.25 kV
IEC 61000-4-6 CS: 150 kHz to 80 MHz: 10 V/m; Signal: 10 V/m
IEC 61000-4-8 NPort S8458 Series:
IEC 61000-4-2 ESD: Contact: 8 kV; Air: 15 kV
IEC 61000-4-3 RS: 80 MHz to 1 GHz: 10 V/m
IEC 61000-4-4 EFT: Power: 4 kV; Signal: 2 kV
IEC 61000-4-5 Surge: Power: 4 kV; Signal: 4 kV
IEC 61000-4-6 CS: 150 kHz to 80 MHz: 10 V/m; Signal: 10 V/m
IEC 61000-4-8
Device Server Specifications
•Serial Interface
Number of Ports
Serial Standards
DB9 male
Serial Line Protection

• 15 KV ESD protection for all signals

• 2 KV isolation protection (NPort S8455 only)

RS-485 Data Direction Control
ADDC® (automatic data direction control)
Pull High/Low Resistor for RS-485
1 KΩ, 150 KΩ
Terminator for RS-485
55 Ω, 120 Ω
Console Port
Dedicated RS-232 console port (8-pin RJ45)
•Serial Communication Parameter
Data Bits
5, 6, 7, 8
Stop Bits
1, 1.5, 2
None, Even, Odd, Space, Mark
Flow Control
50 bps to 921.6 Kbps
•Serial Signals
Tx+, Tx-, Rx+, Rx-, GND
Tx+, Tx-, Rx+, Rx-, GND
Data+, Data-, GND
• Software
Configuration Options
Web Console, Telnet Console, Serial Console, Windows Search Utility
Windows Real COM Drivers
Windows 95/98/ME/NT/2000, Windows XP/2003/Vista/2008/7/8 x86/x64, 2012 x64, Embedded CE 5.0/6.0, XP Embedded
Fixed TTY Drivers
SCO Unix, SCO OpenServer, UnixWare 7, UnixWare 2.1, SVR 4.2, QNX 4.25, QNX 6, Solaris 10, FreeBSD, AIX 5.x
Linux Real TTY Drivers
Linux kernel 2.4.x, 2.6.x, 3.x
Operation Modes
Real COM, TCP Server, TCP Client, UDP, RFC2217
IP Routing
Static, RIP-I, RIP-II
• Reliability
Alert Tools
Built-in buzzer and RTC (real-time clock)
Automatic Reboot Trigger
Built-in WDT (watchdog timer)
MTBF (mean time between failures)

• NPort S8455: 200,951 hrs

• NPort S8458: 163,624 hrs

Ethernet Switch Specifications
•Ethernet Interface
IEEE 802.3 for 10BaseT
IEEE 802.3u for 100BaseT(X) and 100Base FX
IEEE 802.3x for Flow Control
IEEE 802.1D for Spanning Tree Protocol
IEEE 802.1w for Rapid STP
IEEE 802.1Q for VLAN Tagging
IEEE 802.1p for Class of Service
IEEE 802.1x for Authentication
IEEE 802.3ad for Port Trunk with LACP
Network Protocols
ICMP, IP, TCP, UDP, ARP, Telnet, DNS, HTTP, SMTP, SNTP, IGMPv1/v2 device, GVRP, SNMPv1/v2c/v3, DHCP Server/Client, DHCP Option 82, BootP, TFTP, RARP, GMRP, LACP, RMON
MIB-II, Ethernet-Like MIB, P-BRIDGE MIB, Q-BRIDGE MIB, Bridge MIB, RSTP MIB, RMON MIB Group 1, 2, 3, 9
Flow Control
IEEE 802.3x flow control, back pressure flow control interface
• Optical Fiber
 Specifikation lämpliga Fiberkabelvarianter
•Switch Properties
Priority Queues
Max. Number of Available VLANs
VID 1 to 4094
IGMP Groups
• Switch Interface
RJ45 Ports
10/100BaseT(X) auto negotiation speed, F/H duplex mode, and auto MDI/MDI-X connection
DIP Switches
Turbo Ring, Master, Coupler, Reserve
Alarm Contact
2 relay outputs with current carrying capacity of 1A @ 24 VDC
• Warranty
Warranty Period
5 years

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