ABB Relion 650 Series Technical Manual page 550

Section 13
Station communication
544
IEC05000720 V1 EN-US
Figure 249: The download configuration window in LNT
Communication ports
The serial communication module (SLM) is a mezzanine module placed on the first
analog digital conversion module (ADM), and it is used for LON, SPA, IEC
60870-5-103 and DNP communication.
In the following figure, X311 ports A/B are for SPA, IEC103 or DNP3 and X311
ports C/D are for LON protocol.
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Technical manual