SMA Sunny Data Control V.4.2 - Manual (Page 26)

Connecting the PC to a Communication Device SMA Technologie AG
Page 26 SDC-TEN080642 User Manual
Wiring Diagram
1. Plug the 9-pin D-Sub female con-
nector into a free COM port on
your PC. For the pin assignment of
the RS485 connection, please re-
fer to the PC's documentation, or
the plug-in card's documentation.
When connecting the cable, make
sure that Data+ and Data- are a
twisted pair. Shorten the wire of the
fourth, unused conductor, so that
short circuits cannot arise. Take
note of the conductors' color cod-
ing:
2. If the PC is situated at one of the
two ends of the RS485 data bus,
terminate the end of the cable as
described in the PC's documenta-
tion, or in the plug-in card's docu-
mentation.
3. Configure the RS485 data bus'
bias as described in the PC's docu-
mentation, or the plug-in card's
documentation.
4. Lay the cable properly so that there
is no risk of persons tripping over it.
Observe all safety instructions in the Sunny Boy Control / Plus
documentation, and in the PC documentation.
Shut down the PC before you connect the Sunny Boy Control / Plus, as
otherwise one or both COM ports may become damaged.
Data + ____________________
Data- ____________________
GND ____________________
Sunny Boy Control Sunny Boy Control Plus