Specifications

7SR242 Duobias Data Communications
©2010 Siemens Protection Devices Limited Chapter 4 Page 42 of 43
6.1.3 Connecting to the Remote Modem
Once the remote modem has been configured correctly, it should be possible to dial up the modem and make
connection to the relay. As the settings on the remote modem are fixed the local modem should negotiate with it
on connection, choosing suitable matching settings. If it cannot do this, the local modem should be set with
settings equivalent to those of the remote modem as described above.
Figure 6-1 Communication to Device using Sigma 4 and Modem