Siemens Simovert Masterdrives Compendium page 317

Communication / USS
Bus connection via
connector X103
8.1-30
The following illustration shows the structure of a bus connection via
the 9-pin connector, X103 (Compact PLUS).
9-pole Sub-D
To the master
X103
RS485 N
8
No bus termination
Switch S1 "OFF"
Fig. 8.1-15 Connection of the 2-wire bus cable at terminal strip X103
(Compact PLUS)
RS485 P
3
9-pole Sub-D
At the last node on the bus cable,
switch S1 must be in the "ON" position.
6SE7087-6QX70 (Version AD)
Compendium Motion Control
02.2004
9-pole Sub-D
X103
RS485 N RS485 P
8 3
9-pole Sub-D
Siemens AG
SIMOVERT MASTERDRIVES