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When communicating locally in the station using a Personal Computer (PC) or a
Remote Terminal Unit (RTU) connected to the Communication and processing
module, the only hardware needed is optical fibres and an opto/electrical converter
for the PC/RTU, or a RS-485 connection depending on the used IED
communication interface.
1MRK 511 394-UEN A
Section 2
IEC 60870-5-103 overview
670 series 2.2 IEC
15
Communication protocol manual