Siemens 7SR21 Manual page 3

List of Figures
Figure 2-1 Communication to Front USB Port ......................................................................................6
Figure 2-2 Communication to Multiple Devices from Control System using RS485.............................6
Figure 2-3 Communication to Multiple Devices using Fibre-optic Ring Network ................................10
Figure 2-4 Communication to Multiple Devices from Control System and Laptop using
Fibre-optic Star Network ....................................................................................................10
Figure 2-5 Additional (Optional) Rear RS485 + IRIG-B Connection to a PC......................................11
Figure 2-6 Additional (Optional) Rear RS232 + IRIG-B Connection to a PC......................................11
Figure 2-7 RS232 Data Comms Pin Connections...............................................................................11
Figure 3-1 Communication to Device using 7SG24 and Modem........................................................13
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7SR21 & 7SR22 Data Communications
Chapter 4 Page 3 of 15