Product Overview

KPS3101, KPS3102, KPS3204 Serial Device Server supports 1 or 2 Ethernet port and 1, 2, or 4 RS-232/422/485 ports, which provides serial-to-Ethernet connectivity for industrial applications.

KPS3101, KPS3102, KPS3204 supports socket operation mode, including TCP Server, TCP Client and UDP.

KPS3101, KPS3102, KPS3204 provides 12-48 VDC redundant power inputs.

The top panel of the device has DIP switches, DIP switch can be achieved RS485 serial terminal matching resistor enable and disable. It can guarantee the stability and reliability of RS485 serial communication.

KPS3101, KPS3102, KPS3204 can be widely applied in all kinds of applications in factory automation and industrial segments.

Key Features
  • 1 or 2 Ethernet port and 1, 2, or 4 RS-232/422/485 ports
  • Supports socket operation modes, including TCP Server, TCP Client and UDP
  • Supports one-key recovery
  • Build-in 2KV serial Isolation protection
  • IP40 protection class
  • Metal housing with wide temperature rating (-40 to +75℃)
  • Certificates:UL61010, Class I Div 2, CE, FCC, RoHS
Technical SpecificationEthernet Interface

Number of ports:
KPS3101/KPS3102: 1
KPS3204: 2
Speed: 10/100 Mbps, Auto MDI/MDIX
Connector: RJ45
Magnetic Isolation Protection: 1.5 kV (built-in)

Serial Interface

Number of ports:
KPS3101: 1
KPS3102: 2
KPS3204: 4
Serial Standards: RS-232/422/485, software selectable
Connector: DB9 male
ESD Protection: 15 kV for all signals
Isolation Protection: 2 kV (build-in)
DIP-Switch: Enable/Disable 120Ω matching resistor for RS485

Serial Communication Parameters

Data Bits: 5, 6, 7 or 8
Stop Bits: 1, 1.5 or 2
Parity: None, Even, Odd, Space, Mark
Flow Control: XON/XOFF, RTS/CTS, None
Baudrate: 300bps to 460.8kbps


Security Protocols:HTTPS, SSH2


System: PWR1, PWR2, Run
Serial port: S1-T/R, S2-T/R, S3-T/R, S4-T/R


Reset: Supports "reset to factory default settings"

Power Requirements

Input voltage:12 to 48 VDC, recommended 24 VDC
Power plug: 4-pin terminal block
Power Consumption:
KPS3101/3102: 1.8W
KPS3204: 3.2W
Overload protection: Support
Reverse protection: Support
Redundancy protection: Support

Physical Characteristics

Housing: Aluminum
KPS3101: 165g
KPS3102: 170g
KPS3204: 320g
KPS3101/KPS3102: 30×115×68 mm(W×H×D)
KPS3204: 54×134×106 mm(W×H×D)
Protection level: IP40
Installation: DIN-rail mounting

Environmental Limits

Operating temperature: -40 to 75℃
Storage temperature: -40 to 85℃
Operating humidity: 5 to 95% RH

Quality Assurance

Warranty: 5 years


UL61010, Class I Div 2, CE, FCC, RoHS
IEC 60950-1, EN 60950-1

Industrial Standard
  • EMI

EN 55032

FCC Part 15 Subpart B Class A

  • EMS

EN 55024

IEC61000-4-2(ESD): ±6kV(contact),±8kV(air)

IEC 61000-4-3(RS): 10V/m (80MHz–2GHz,)

IEC61000-4-4(EFT): Power Port:±2kV;Data Port:±1kV IEC61000-4-5(Surge): PowerPort: ±1kV/DM, ±2kV/CM; Data Port:±1kV

IEC 61000-4-6(CS): 10V(150KHz-80MHz)

  • Machinery



IEC60068-2-32(Free Fall)

Ordering Information
Available Models 
KPS3101-1T1D-L17-L171-port Serial Device Servers
KPS3102-1T2D-L17-L172-port Serial Device Servers
KPS3204-2T4D-L17-L174-port Serial Device Servers
NameTypeFile Size
User Manual

Unmanaged Switches


DIN Rail Ethernet Switches

Select the fields to be shown. Others will be hidden. Drag and drop to rearrange the order.
  • Image
  • SKU
  • CPU
  • pa_height
  • Memory
  • Storage
  • Unmanaged/managed
  • Installation
  • Operation Temperature
  • Interface
  • Network Interface
  • Number of Ports
  • Power Supply
  • Certificate
  • Connectors
  • CPU
  • Display Port
  • Expansion
  • Features
  • Highlight Functions
  • I/O
  • IP Class
  • Memory
  • Port Numbers
  • Redundancy
  • Serial Port
  • Storage
  • USB