SMA Sunny Data Control V.5.0 - Manual (Page 22)

Connecting the PC to a Communication Device SMA Technologie AG
24 SDC-TEN081450 Technical Description
• We recommend the following cable types for indoors.
SMA communications cable: COMCAB-INxxx*
*Available in the following lengths: xxx = 100 m/200 m/500 m and 1000
Lappkabel cables: UNITRONIC Li2YCY (TP) 2 x 2 x 0.22 mm
2
Helukabel cables: 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 is made 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