NPort S8000 Series Combo switch / serial device server

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 (S8455 only)
    • Adjustable pull high/low resistor for RS-485 ports (S8455 only) 
  • Built-in managed Ethernet switch 
    • S8455I Fiber: Two fiber Ethernet ports and three Ethernet ports
    • S8455I All Copper: 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 S8000 series combines an industrial device server with a full-function managed Ethernet switch 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 S8000 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 S8000 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 S8000 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 S8000 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.

Rugged Design with Complete Protection 
























General Specifications
• Port Summary
Serial Ports 4 RS-232/422/485 ports
Ethernet Switch Ports NPort S8455I all copper: 5 RJ45 copper ports
NPort S8455I fiber: 3 RJ45 copper ports and 2 fiber ports
NPort S8458: 4 RJ45 copper ports and 4 fiber ports
Console Ports 1 (8-pin RJ45 connector)
• Physical Characteristics
Housing Metal
Weight NPort S8455I: 578 g (1.27 lb)
NPort S8458: 1,105 g (2.44 lb)
Dimensions NPort S8455I: 73.1 x 134 x 125 mm (2.88 x 5.27 x 4.92 in)
NPort S8458: 93 x 144 x 125 mm (3.66 x 5.64 x 4.92 in)
• Environmental Limits
Operating Temperature Standard Models: 0 to 60°C (32 to 140°F)
Wide Temp. Models:
NPort S8455I-T: -40 to 75°C (-40 to 167°F)
NPort S8458-T: -40 to 85°C (-40 to 185°F)
Storage Temperature -40 to 75°C (-40 to 167°F)
Ambient Relative Humidity 5 to 95% (non-condensing)
• Power Requirements
Input Voltage 12 to 48 VDC
Input Current NPort S8455I: 935 mA @ 12 VDC
NPort S8458: 940 mA @ 12 VDC
• Standards and Certifications
Safety UL 508, UL 60950-1
EMC EN 55022/24
EMI CISPR 22, FCC Part 15B Class A
EMS NPort S8455I:
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: Power: 2 kV; Signal: 1 kV
IEC 61000-4-5 Surge: Power 1 kV (4 kV for all copper models); Signal: 0.25 kV
IEC 61000-4-6 CS: 150 kHz to
Hazardous Location UL/cUL Class I Division 2 Groups A/B/C/D (S8455I all copper model only)
• Warranty
Warranty Period 5 years
Details See
• Device Server Specifications
• Serial Interface
Number of Ports 4
Serial Standards RS-232/422/485
Connector DB9 male
Serial Line Protection 2 kV isolation protection (NPort S8455I 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-485 120 Ω
Console Port Dedicated RS-232 console port (8-pin RJ45)
• Serial Communication Parameters
Data Bits 5, 6, 7, 8
Stop Bits 1, 1.5, 2
Parity None, Even, Odd, Space, Mark
Flow Control RTS/CTS and XON/XOFF
Baudrate 50 bps to 921.6 Kbps
• Serial Signals
RS-422 Tx+, Tx-, Rx+, Rx-, GND
RS-485-4w Tx+, Tx-, Rx+, Rx-, GND
RS-485-2w Data+, Data-, GND
• Software
Configuration Options Web Console, Telnet Console, Serial Console, Windows Utility
Windows Real COM Drivers Windows 95/98/ME/NT/2000, Windows XP/2003/Vista/2008/7/8/8.1/10 (x86/x64), Windows 2008 R2/2012/2012 R2 (x64), Windows Embedded CE 5.0/6.0, Windows XP Embedded
Fixed TTY Drivers SCO Unix, SCO OpenServer, UnixWare 7, QNX 4.25, QNX 6, Solaris 10, FreeBSD, AIX 5.x, HP-UX 11i, Mac OS X
Linux Real TTY Drivers Linux 2.4.x, 2.6.x, 3.x, 4.x
Android API Android 3.1.x and later
Operation Modes Real COM, TCP Server, TCP Client, UDP, RFC2217
Management SNMP MIB-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)
Time NPort S8455I Single-mode: 286,993 hrs
NPort S8455I Multi-mode: 200, 951 hrs
NPort S8455I All copper: 287,354 hrs
NPort S8458: 163,624 hrs
Standard Telcordia (Bellcore) Standard TR/SR
• Ethernet Switch Specifications
• Ethernet Interface
Standards IEEE 802.3 for 10BaseT
IEEE 802.3u for 100BaseT(X) and 100BaseFX
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 Authenti
Network Protocols ICMP, IPv4, TCP, UDP, ARP, Telnet, DNS, HTTP, SMTP, SNTP, IGMPv1/v2, GVRP, SNMPv1/v2c/v3, DHCP Server/Client, DHCP Option 82, BootP, TFTP, SNTP, SMTP, RARP, GMRP, LACP, RMON
MIB 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
• Switch Properties
Priority Queues 4
Max. Number of Available VLANs 64
VLAN ID Range VID 1 to 4094
IGMP Groups 256
• Optical Fiber Interface



• 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

Available Models

  Model No. Description
NPort S8455I 4 RS-232/422/485 ports, 5 10/100M Ethernet ports, 12 to 48 VDC, 2 kV isolation protection, 0 to 60°C operating temperature
NPort S8455I-T 4 RS-232/422/485 ports, 5 10/100M Ethernet ports, 12 to 48 VDC, 2 kV isolation protection, -40 to 75°C operating temperature
NPort S8455I-MM-SC 4 RS-232/422/485 ports, 3 10/100M Ethernet ports, 2 100M multi-mode fiber ports with SC connector, 15 KV ESD, 12-48 VDC, 0 to 60°C
NPort S8455I-SS-SC 4 RS-232/422/485 ports, 3 10/100M Ethernet ports, 2 100M single-mode fiber ports with SC connector, 15 KV ESD, 12-48 VDC, 0 to 60°C
NPort S8455I-MM-SC-T 4 RS-232/422/485 ports, 3 10/100M Ethernet ports, 2 100M multi-mode fiber ports with SC connector, 15 KV ESD, 12-48 VDC, -40 to 75°C
NPort S8455I-SS-SC-T 4 RS-232/422/485 ports, 3 10/100M Ethernet ports, 2 100M single-mode fiber ports with SC connector, 15 KV ESD, 12-48 VDC, -40 to 75°C
NPort S8458-4S-SC-T 4 RS-232/422/485 ports, 4 10/100M Ethernet ports, 4 100M single-mode fiber ports with SC connector, 12-48 VDC, -40 to 85°C operating temperature

Optional Accessories

 Power Adaptors
  Model No. Description
PWR-12125-WPEU-S1 Non-locking barrel plug, 12VDC 1.25A, 100-240VAC with Continental European (EU) Plug, 0 to 40°C
PWR-12125-WPAU-S1 Non-locking barrel plug, 12VDC 1.25A, 100-240VAC with Australian (AU) Plug, 0 to 40°C
PWR-12125-WPCN-S1 Non-locking barrel plug, 12VDC 1.25A, 100-240VAC with China (CN) Plug, 0 to 40°C
PWR-12125-WPUK-S1 Non-locking barrel plug, 12VDC 1.25A, 100-240VAC with United Kingdom (UK) Plug, 0 to 40°C
PWR-12125-WPUSJP-S1 Non-locking barrel plug, 12VDC 1.25A, 100-240VAC with US/JP Plug, 0 to 40°C
  Model No. Description
Mini DB9F-to-TB DB9 Female to Terminal Block connector
 Trial Software
  Model No. Description
MXview Industrial network management software designed for converged automation networks