SMA Sunny Data Control V.4.2 User Manual
Page 25
SMA
Technologie AG
Connecting the PC to a Communication Device
User Manual
SDC-TEN080642
Page 25
•
We recommend the following cable types for indoors:
SMA data cable: COMCAB-INxxx*
*available in the following lengths xxx = 100 m/200 m/500 m und 1000 m.
Lappkabel: UNITRONIC Li2YCY (TP) 2 x 2 x 0,22 mm
2
Helukabel: PAAR-TRONIC-Li-2YCY 2 x 2 x 0,22 mm
2
Jumper Functions
Termination
To increase the signal quality of the RS485 data bus, it must be terminated at both ends.
Each termination occurs with a 120 W resistor between the two data lines. Terminate
the last Sunny Boy Control / Plus by means of a jumper. The position of the jumper is
described in the user manual of the Sunny Boy Control / Plus.
Signal Biasing
To increase the signal quality of the RS485 data bus, a maximum of one bias can be
connected in the data bus. We recommend connecting the bias at the PC.
Pin Assignment of the Connection Cable
Sunny Boy Control
PC
Signal
Pin
Pin
Signal
Data +
3
Data +
Data-
8
Data-
GND
5
GND