Simons Voss Technologies SPEL Guide Abrégé page 41

3. Connections
Connection
COM
NO
The expansion and antenna connection are only available in
the ADV version:
RS-485: COM
RS-485: A
RS-485: B
Description
Relay: COM (Common).
This contact is wired either
against an NC relay (break
contact) or against a NO
relay (closing contact).
Relay: NO (Normally open).
This contact is closed
against Relay COM when
switched.
RS-485 bus connection for
external modules.
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