7SR220 Technical Manual
Chapter 4 - Page 8 of 96 © 2017 Siemens Protection Devices Limited
2.2 USB Interface (COM2)
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. When connecting to Reydisp using this connection the default settings can be used without
the need to first change any settings.
Access to the communication settings for the USB port is only available from the relay front fascia via the key pad
setting menu COMMUNICATIONS MENU.
Setting Name Range/Options Default Setting Notes
COM2-USB
Protocol
OFF
IEC60870-5-103
MODBUS-RTU
ASCII
DNP3
IEC60870-5-103
Reydisp
software requires
IEC60870-5-103.
COM2-USB
Station
Address
0 - 254 for IEC60870-5-103
1 - 247 for Modbus RTU
0 - 65534 for DNP3.0
0
An address within the
range of the relevant
protocol must be
given to identify the
relay. Each relay in a
network must have a
unique address.
COM2-USB
Mode
Local
Local or Remote
Remote
Local
Refer to Appendix
1, page 95, for
further explanation
Local Engineer Access
Fig. 2-1 Communication to Front USB Port
2.3 RS485 Interface (COM1)
The 2-wire RS485 communication port is located on the rear of the relay and can be connected using a suitable
RS485 120 Ohm screened twisted pair cable.
USB Type B
Socket on Device
USB Type A
Socket on PC
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