Product Overview

KPS3101A, KPS3102A, KPS3204A, KPS3208A Serial Device Server supports 1 or 2 Ethernet port and 1, 2, 4, or 8 RS-232/422/485 ports,which provides serial-to-Ethernet connectivity for industrial applications. KPS3X0XA series supports socket operation mode, including TCP Server, TCP Client and UDP, provides 12-48 VDC redundant power inputs. KPS3X0XA series support one-key recovery, and can send alarm message by the SMTP mail, to ensure that network problems can be found in time; at the same time, the device also supports SSH, SSL, MAC address filtering, user classification, AES/DES/3DES and other security functions, to protect the network security and stability.KPS3X0XA series 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.

KPS3101A&KPS3102A&KPS3204A&KPS3208A 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, 4, or 8 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:CE, FCC (PENDING)
Technical SpecificationEthernet InterfaceNumber of ports:
KPS3101A/KPS3102A: 1
KPS3204A/KPS3208A: 2
Speed: 10/100 Mbps, RJ45 port
Serial InterfaceNumber of ports:
KPS3101A: 1
KPS3102A: 2
KPS3204A: 4
KPS3208A: 8
Serial Standards: RS-232/422/485, software selectable
Connector: DB9 male
Isolation Protection: 2 kV (build-in)
DIP-Switch: Enable/Disable 120Ω matching resistor for RS485
Serial Communication ParametersData Bits: 5, 6, 7 or 8
Stop Bits: 1, 2
Parity: None, Even, Odd
Baudrate: 1200bps to 230.4kbps
RouteSupport static routing
Software FunctionSupport security Protocols:HTTPS, SSH2, MAC address filter, AES, DES, 3DES
Support SNMP v1/v2c, SMTP, DHCP, DNS, FTP protocols
Equipment managementWeb management (HTTP / HTTPS)
KyCMT (device search, IP address configuration and other functions)
SNMP v2c
SNMP trap
Equipment Maintenance FunctionUpgrading through web
FTP, TFTP and syslog
SMTP mail alert
Equipment alarm indicator
Automatic reconnection after disconnection
Clock CharacteristicsSupport NTP client
LED indicatorsReset LED: Reset
Power LED: Power
Run LED: Run
Alarm LED: Alarm
Tx/Rx LED: Serial port transmit /Receive data
Physical CharacteristicsHousing: Metal
KPS3101A: 31×105×77 mm(W×H×D)
KPS3102A: 40×105×77 mm(W×H×D)
KPS3204A: 40×137×86 mm(W×H×D)
KPS3208A: 40x200x104 mm(W×H×D)
Protection level: IP40
Installation: DIN-rail or Wall mount
Power RequirementsInput voltage:12 to 48 VDC
Power plug: 5-pin terminal block
Power Consumption:
KPS310A/3102A/3204A: 3W
KPS3208A: 5W
Overload protection: Support
Reverse protection: Support
Redundancy protection: Support
Environmental LimitOperating temperature: -40 to 75℃
Storage temperature: -40 to 85℃
Operating humidity: 5 to 95%, no condensation
Industry StandardEMI:
FCC CFR47 Part15, EN55022/CISPR22,ClassA
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)
IEC60068-2-32(Free Fall)
Ordering Information
ModelsEthernet PortsRS232/422/485Power
KPS3101A-1T1D-232/485/422-L17-L171112-48V DC
KPS3102A-1T2D-232/485/422-L17-L171212-48V DC
KPS3204A-2T4D-232/485/422-L17-L172412-48V DC
KPS3208A-2T8D-232/485/422-L17-L172812-48V DC
NameTypeFile Size

Modbus TCP/RTU


DIN Rail Ethernet Switches

IP Class



Full 100M

Network Interface

RJ45 Connectors

Number of Ports

0 – 8

Operation Temperature

-40°C ~ 75°C

Power Supply

12-48V DC

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