Specifications

7SR242 Duobias Data Communications

2.1 Communication ports

2.1.1 USB Interface

The USB communication port is connected using a standard USB cable with a type B connection to the relay and

type A to the PC.

The PC will require a suitable USB driver to be installed, this will be carried out automatically when the Reydisp

software is installed. When the Reydisp software is running with the USB cable connected to a device an

additional connection is shown. Connections to these devices are not shown when they are not connected.

The USB communication interface on the relay is labelled Com 2 and its associated settings are located in the

Data communications menu. To enable communication with Reydisp via the USB port the following setting

changes must be made from the relay fascia.

Setting name

Range Default Setting Notes

Station Address

0 … 65534 0 0 - 254

An address between 1 and

254 must be given to identify

the relay

COM2-USB Protocol

OFF, IEC60870-5-103,

MODBUS-RTU, ASCII,

DNP3

IEC60870-5-

103

IEC60870-

5-103

Reydisp software is

compatible with IEC60870-

5-103.

Figure 2-1 Communication to Front USB Port