SMA Wireless-Set485-01 - Manual (Page 20)

Electrical Connection SMA Solar Technology AG
20 WirelessSet485-IEN091511 Installation Guide
5.4.2 Connecting the Sunny Boy Control to the RS485-Power
Injector
RS485 Power Injector
1. Remove around 4 cm of the cable sheath at the
RS485 Power Injector end of the communication
cable.
2. Shorten the shielding to 1.5 cm, fold it back, and
wrap it with conductive adhesive foil.
3. Connect the leads to the clamps (Data+, Data--,
GND) on the plug for the RS485 Power Injector.
Data+ and Data– must be a twisted lead pair.
4. Note the connection and lead color:
3 Data+ _____________________
5 Data-- _____________________
8 GND ____________________
5. Plug the plug into the RS485 Power Injector input
port (IN).
Sunny Boy Control
6. Connect the leads on the Sunny Boy Control side to
the pins on the D-Sub plug (3, 5 and 8) - see point
4.
7. Mount jumpers at the Sunny Boy Control as is described in the Sunny Boy Control manual
8. Plug the D-Sub plug into the Sunny Boy Control.
You have successfully connected the RS485 Power Injector with the Sunny Boy Control.
If... Then...
Sunny Boy Control is at the center of the
communication bus. - Do not establish termination (jumper A).
- Establish pull-up/pull-down of signal (jumpers B
and C).
Sunny Boy Control is at the end of the RS485
communication bus. - Establish termination (jumper A)
- Establish pull-up/pull-down of signal (jumpers B
and C).