SMA Sunny Data Control V.5.0 - Manual (Page 23)

Connecting the PC to a Communication Device SMA Technologie AG
Technical Description SDC-TEN081450 25
Wiring Diagram
PC
1.
2. Plug the 9-pin D-Sub female connector into a
free COM port on your PC.
For the pin assignment of the RS485 connection,
please refer to the PC's documentation, or the
plug-in card's documentation.
Data+ and Data– leads must be a twisted pair.
3. Shorten the wire of the fourth, unused conductor,
so that short circuits cannot arise.
4. Note down the wire color:
Termination
5. Only if the PC is at one end of the 485 data bus:
Terminate the end of the cable as described in
the instructions for the PC or the plug-in card.
Signal biasing
6. Configure the RS485 data bus' bias as
described in the PC's documentation, or the
plug-in card's documentation.
7. Lay the cable properly so that there is no risk of
persons tripping over it.
NOTICE!
Possible damage to the COM interfaces of the Sunny Boy Control/Plus and
the PC.
The COM interfaces of both devices could be damaged if the PC is turned on and
then the devices are connected to one another.
• Switch off PC
Data + ____________________
Data - ____________________
GND ____________________