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PSI-MODEMSHDSL/SERIAL
1-14
PHOENIX CONTACT
104275_en_c00
Structure of a head station
For the star structure, individual line structures are coupled together via a head station. In
both examples above, devices A5, B2, and C3 are connected via a DIN rail connector
(T-BUS).
Figure 1-12
Examples for RS-485 head stations
Key
①
,
②
,
③
... Segments
For a head station, we recommend connecting devices via the T-BUS. In this way, the
segments are electrically isolated.
T-BUS
①
②
③
④
⑤
⑥
①
②
③
④
⑤
⑥
⑦
⑧
Not recommended (RS-485)
Recommended (RS-485)