Siemens Argus 7SR21 - E12 Case

7SR21 & 7SR22 - Installation Guide
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4.3 E12 Case
Figure 4.3-1 E12 Standard + Additional Comms (IRIG B, 2 x F.O. (ST Connectors)) (See Note 2)
Figure 4.3-2 E12 Standard + Additional Comms (IRIG B + RS485) (See Note 2)