Siemens Argus 7SR21 - E8 Case

7SR21 & 7SR22 - Installation Guide
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4.2 E8 Case
Figure 4.2-1 E8 Standard Comms (USB Front Port, Rear RS485) (See Note 2)
Figure 4.2-2 E8 Standard + Additional Comms (IRIG B, 2 x F.O. (ST Connectors)) (See Note 2)