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Chapter 4) 7SR158 - Data Communications
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
OFF
IEC60870-5-103
COM2-USB
MODBUS-RTU
Protocol
ASCII
DNP3
COM2-USB
0 - 254 for IEC60870-5-103
Station
1 - 247 for Modbus RTU
Address
0 - 65534 for DNP3.0
Local
COM2-USB
Local or Remote
Mode
Remote
Local
Engineer
Access
Chapter 4 - Page 8 of 66
Range/Options
USB Type A
socket on PC
USB Data Cable
USB Type A
Fig. 2-1 Communication to Front USB Port
Default
Setting
IEC60870-5-103
0
Local
© 2013 Siemens Protection Devices Limited
Notes
Reydisp
software requires
IEC60870-5-103.
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.
Refer to
Appendix
1, page 65, for
further explanation
USB Type B
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