TRP-C37MA Modbus TCP to RTU/ASCII Gateway with Remote Monitoring


In addition to Modbus TCP to RTU/ASCII function, The TRP-C37MA is able to remote monitoring serial device. There are 2 models to choose from: Automatic monitoring mode: The Serial device must be sends a single pulse to TRP-C37MA continually per 30 seconds.   If serial device do not send a single pulse over 30 seconds ,the TRP-C37MA will be actives the relay. Manual mode: If the serial device need to restart, user can feel free to set the relay enable through the TRP-C37MA web configuration.


  • Automatic remote monitoring serial device.

  • Automatic restart the serial device.

  • Direct active the  relay by web page.

  • Read the counter value and DI status from w web based utility.

  • Adjustable relay latch time from  web based utility.

  • Wide input range DC power supply.

  • Power Input detection circuit.

  • External watchdog function prevents system or power fail. 

  • Support Auto-MDIX twisted pair crossover detection and Auto-Correction.

  • Maximum Connection 16 Client PC at Server Mode.

  • Compatible with    Modscan32 ,Modbus Poll,CAS Modbus Scanner   and SCADA .. application.

  • Maximum 8 sets host IP that limits network access.

  • Surge protection and over current and over voltage on RS-422/485 data lines.

  • Support baud rate from1200~921600Kbps.

  • Auto switching RS-232/422/485 signal interface.

  • Virtual COM drivers for Windows 98/WIN2000/WIN XP/Vista/WIN2003/WIN 7/WIN 8/WIN 8.1 and WIN10.

  • Virtual Com Support Server, Client, UDP mode.

  • Virtual Com Support Modscan32 or Modbus Poll utility.

  • Fully compatible with Ethernet and TCP/IP protocol.

  • Supports 10/100 Mbps Ethernet.

  • Power/Link/UART RX/UART TX mode LED indicator.

  • Heart Beat function ensures a reliable communicating connection.

  • Auto reconnection when power or Ethernet fail.

  • Back to factory configuration by external switch.

  • Update the firmware from LAN.

  • Dual power input select from screw terminal or DC-Jack.


  • Power Input Voltage: DC +10V to +30V.

    LAN: Auto-MDIX, 10/100 Mbps Auto-detecting.

    RS-232: TX, RX, RTS, CTS, DTR, DSR, DCD, GND.

    RS485 signal: differential 2 half-duplex wires (DATA+, DATA-).

    RS422 signal: differential 4 full-duplex wires.(TX+,RX+,TX-,RX-)

    Baud Rate: 1200,2400,4800,9600,19200,38400,57600,115200,921600 K bps.

    Parity: none, even, odd.

    Data Bits: 5, 6, 7 or 8.

    Stop Bits: 1, 1.5 or 2.

    Protocol: TCP, IP, ARP, DHCP, Telnet, HTTP, UDP, ICMP.

    Modbus TCP Type: TCP Master to Serial Slave, TCP Slave to Serial Master.

    TCP Slave to Serial Master Mode: Maximum 8 TCP Port. UID Range:00~FF.

    External switch:      OFF  OFF : Directly IP mode, RTU protocol. 

                                            ON   OFF: Virtual-Com and Paired mode .

                                            OFF  ON: Directly IP mode, ASCII protocol

                                            ON   ON: Back to Factory.

    Virtual-Com mode support RS232 TXD,RXD,GND.

                                             RS422 TX+,TX-,RX+,RX-.

                                             RS485 D+,D-.

    Heartbeat function: TCP 5300 port send a strings per 5 seconds.

    Maximum TCP connections at the same time: 16.

    Digital I / O connector: D-type 9PIN female.

    Digital input an effective voltage: DC +/- 4 ~ 30V.

    Digital Input count : 0~65535.

    Relay setting start to closing time: 1 ~ 255 (ms / unit).

    Relay specifications: two independent NC, COM, NO.

    Relay contact capacity: AC 125V / 0.5A, DC 30V / 2A, DC110V / 0.3A.

    Power supply: Screw terminal, or DC jack.

    Serial interface: +/-15 KV ESD.

    RS422/485 interface: Surge, over current, over voltage protection.

    RS422/485 interface: Industrial plug-in screw terminal.

    Plug-in screw terminal wiring: Accepts AWG #12 ~30 wires.

    Power consumption: 12V/140mA.

    Operating Temperature: -10 to 65 °C.

    Humidity: 0~90% Non-Condensing.

    Dimensions: 151(L)*75(W)*26(H) mm.

    Weight: 395g with packing.



1.8M D-SUB 9 pin female to female Null-Modem cable

Switching Adaptor

Input:100~240VAC 50/60Hz 260mA

Output: DC 12V/1A

PWR-AD12VAuto (Option)

Certificate: CE, FCC, UL, PSE

US Specification  

We also provide the EU / AUS / British specifications(MOQ:50PCS/2 Weeks)……more

DIN-RAIL-R (Option)

DIN rail mounting adapter