Rockwell Automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM - Manual (Page 322)

Publication AG-UM008C-EN-P - February 2005
10-2 Using Dial-up Telephone Communication
Overview You can implement dial-up communication in a telemetry system as
shown in the following configurations (Figure 10.1 and Figure 10.2).
Use dial-up communication for peer-to-peer communication between
processors, as shown below. This is most appropriate for applications
that do not require extensive communication time.
Figure 10.1 Dial-up Communication
Use the public switched telephone network to communicate between
a master station and multiple remote stations.
A master station can contact each remote station through the
telephone lines on a scheduled basis and/or the remote stations can
dial-up the master station on a report-by-exception basis.
Figure 10.2 Public Switch Telephone Network
41192
Enhanced
PLC-5
Processor
SLC 5/03
Processor
Modem
Modem
RS-232
RS-232
41193
RS-232
remote station remote station remote station remote station
dial-up modems
dial-up modem
RS-232
master station