KPM204 MODBUS gateway

KPM204 Modbus gateway is an important part of the intelligent distribution automation system to complete the power distribution room microcomputer protection,automatic devices,monitoring and other intelligent devices and computer systems,power grid automation system to achieve the exchange of information between the far station information to the host exchange and network exchange,thus forming a fully decentralized RTU and MQTT communication system.

KPM204 is with 4 RS485 port and 2 RJ45 port. Optional WIFI, GPRS, 4G wireless connection method. 


  • Modbus gateway Hardware: 
  • NUC 970 CPU
  • Built in 64M DDR2, WDT, RTC, etc. 
  • 128M NAND Flash (support 128M/256M/512M)
  • Supports PRNG/DES/3DES/AES/SHA/HMAC encryption with up to 256-bit encryption mode.
  • Communication interface:
  • Downlink: MODBUS protocol, 4 RS485 port, 1 RS232 port, built-in ESD protection.
  • Uplink:
  • 2*10M/100M internet with RJ45 interface. 
  • 1 USB interface, 1 SIM card interface, 1 antenna interface
  • Optional WIFI, radio frequency 850/900/1800/1900MHz (2G/3G/4G). 
  • Optional function:
  • 4 digital input, dry contact input.
  • 4 relay output, max drive current 200mA.
  • 4 analog input, support 0-5VDC and 4-20mA. 
  • Power supply 9-35VDC, 12VDC/3A or 24VDC/1.5A. 
  • Mechanical properties:
  • Metal shell, DIN rail mounted
  • 135mm * 110mm * 42mm
  • Operating temperature: -40~85℃
  • IP63


Function type    
Working power Rated voltage DC 9-48V
Power consumption <3VA
Capacity index Network interface  2 * 10/100M RJ45 interface
Serial port  4 * RS485 port
Communication master station protocols <16/pc
Serial port rate 300bps to 38.4kbps, programmable
Transmission mode Full or half duplex
Performance index Dual machine switching time <5s
MTBF >50000h
Status indication Panel LED, reflecting the serial port data transmission and reception status
Protocol Standard protocol IEC60870-5-101/103/104,MODBUS,CDT,
Special protocol DNP3.0 and other over 30 protocols,can be developed according to on site needs
EMC Fast pulse group immunity IEC61000-4-5, level 3
Surge immunity IEC61000-4-2, level 3
Electrostatic immunity IEC61000-4-4, level 3
Working environment Ambient temperature -25℃~+70℃
Relative temperature 5%~95%, no condation
Storage temperature -30℃~+75℃
Mounting size Mounting type DIN rail / Wall mounted
Size L×W×H 135mm×110mm×50mm

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