Technical Guidance Notes
©2007 Siemens Protection Devices Limited
Page 5 of 29
Section 1: Introduction
This note describes the connection of the RUGGEDCOM RMC30 external Ethernet interface to the
RS485 port of Reyrolle Relays.
The new generation of Reyrolle relays support the DNP3 communications standard, in addition to
MODBUS and IEC60870-5-103 provided previously. Each communications port allows the user to
select a protocol, independent of the other ports, via a setting accessed through the Relay’s fascia. In
a communications system the Relay will be the slave device. There is a requirement for Ethernet
access to these relays and the RMC30 device provides a solution to accomplish this requirement.
The RMC30 can be configured as a dedicated MODBUS server, DNP3 SERVER, or a simple Ethernet
tunnel. Examples of all three methods are described below.
The information for the RMC30 was taken from [1] Rugged Operating System v3.2 User Guide, please
refer to that document for a more detailed description of configuration.
