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Serial communication
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The serial communication can be used for different purposes, which enable better ac-
cess to the information stored in the terminals. The serial communication is also used
for communication directly between terminals (bay-to-bay communication).
The serial communication can be used with a station monitoring system (SMS) or with
a substation control system (SCS). Normally, SPA communication is used for SMS and
SCS; LON communication is used for SCS. Additionally, LON communication can
also be used for SMS 510. SPA communication is also applied when using the front
communication port, but for this purpose, no special serial communication function is
required in the terminal. Only the software in the PC and a special cable for front con-
nection is needed.
The rear SPA-port can alternatively be set up for IEC 60870-5-103 communication.
IEC 60870-5-103 is a standard protocol for protection functions.
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