R025 RS232 / Ethernet converter, Modbus router

RS232 / Ethernet converter, Modbus router

Same as R020, firmware extended by Modbus RTU / TCP routing functionality. Supply 10..35 V DC / 24 V AC. DIN rail mounting, dimensions 98,7 x 64 x 36,2 mm


R025 is a 10/100 Mbit Ethernet to RS232 converter, also called “terminal server”. It is configurable as Modbus RTU/TCP router. This converter is a successor of the previous type M025. 
  • remote Modbus RTU/RS232 device to SCADA Modbus TCP connection via an Ethernet network
  • bridge function – virtual channel RS232 in an Ethernet network (between two R025)
  • modem emulation - converters are connected using AT commands in an Ethernet network 

The R025 module contains all the features of the R020 module. It is able to connect a RS232 device to a PC over an Ethernet network. The Digi RealPort Software creates a virtual COM port on the host PC. This virtual port enables any software to communicate with a remote RS232 device. The COM port redirector runs under Microsoft Windows, UNIX and Linux. Maximum communication speed is 230400 bps.
The main difference between R020 and R025 is the industrial automation profile selection option for R025. This is the Modbus RTU/TCP router functionality. On the TCP side the module acts as slave (server) and sends the requests as master (client) to the serial line with Modbus RTU.
The module parameters and functions are configured over SNMP or secured web communication (HTTP / HTTPS protocols). Power presence is indicated by a green LED close to the serial connector. The Ethernet connector provides two LEDs: Link and Network activity. The network switches automatically between 10 and 100 Mbit/s. 
 2 04/2016 Subject to technical changes. domat R025
A CANON 9M device connects through a nullmodem (“crossed”) serial cable with CANON 9F connector at both sides (“terminal-terminal” connection). A CANON 9F device connects through a modem (“straight”) serial cable with CANON 9M and CANON 9F connectors. All RS232 signals except for RING (1- DCD, 2 - RXD, 3 - TXD, 4 - DTR,  5 - GND, 6 - DSR, 7 - RTS a 8 - CTS) are transmitted. Usually only RXD, TXD and GND are used.
The module is 36.2 mm wide and mounts on a standard DIN rail.