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4 port Modbus TCP to RTU/ASCII Gateway


  • Wide input range DC power supply.
  • Provide 3KV optical isolation protection.
  • Supports Ethernet Mode like TCP Server, TCP Client, and UDP.
  • Support Auto-MDIX twisted pair crossover detection and auto-correction.
  • Maximum allowed bandwidth is 460 Kbps per Serial Port.
  • Supports PPPoE , DDNS , NTP , FTP , Telnet.
  • Runs in Stand Alone Mode.
  • Built in Restore Factory default push button.
  • Auto direction RS485 flow control by hardware.
  • Power/Link and 4 pairs serial RX/TX mode LED indicator.
  • Support screw terminal and standard external DC power adaptor.
  • Panel mounts and Din-Rail Support.


  • CPU:32 bit 580MHZ with MMU.
  • Power Input Voltage: DC +9V to +24V.
  • LAN: Auto-MDIX, 10/100 Mbps Auto-detecting.
  • RS-232: TX, RX, GND.
  • RS-422: TX+, TX-, RX+, RX-.
  • RS-485: Data +, Data –.
  • Data Rate: 75~230.4Kbps.
  • Parity: none, even, odd.
  • Data Bits: 5, 6, 7 or 8.
  • Stop Bits: 1, 2.
  • Configuration through Windows Admin Utility / Web Console / Telnet Console.
  • Protocol: ARP , IP , ICMP , UDP , TCP , HTTP , DHCP,PPPoE , DDNS , NTP , FTP , Telnet.
  • Power supply: Screw terminal, or standard external DC adapter.
  • Serial interface: +/-15 KV ESD.
  • RS422/485 interface: Surge, over current, over voltage protection.
  • Serial terminal and Ethernet with 3KV Optical Isolation.
  • Power consumption: 12V/400 mA .
  • Operating Temperature: -20 °C to 65 °C.
  • Humidity: 0~90% Non-Condensing.
  • Dimensions: 224(L)*107(W)*33(H) /mm.
  • Weight: 400g (W/Packing).


TRP-C34M is a 4-Port Modbus gateway. There are two functions below: Modbus RTU/ASCII serial master to Modbus TCP slave bi-diction. Modbus TCP master to Modbus RTU/ASCII slave bi-direction.

The TRP-C34M is able to run under industrial environment stable, it provides 3KV optical isolated protection between Ethernet interface and 4-port serial interface.

The TRP-C34M provides a watchdog timer function that allows the system to automatically recover from a system crash. When the TRP-C34M microprocessor stop working correctly, the watchdog timer waits for a preset period of time and performs a hardware reset.