SMA Sunny Boy Control - Manual (Page 28)

Sunny Boy Control
SMA Technologie AG
User Manual SUNBC-14:NE0206 24
Jumper A: Termination of the RS485 cable. The data cable must
be terminated on both ends. If the Sunny Boy Control is
at the beginning or end of the cable, the cable must be
terminated by either setting jumper A or bridging pins 7
and 9 of the connector. The required resistance is
120
Ω
. Basically, jumper A is a bridge between pins 7
and 9 of the connector. The default setting is “not termi-
nated”.
Jumpers B and C: Pull-up/pull-down resistances for the RS485 signal. The
RS485 pull-up/pull-down resistances are achieved by
either setting jumpers B and C on the Sunny Boy Con-
trol or using a cable plug with integrated resistors. The
required resistances are 680
Ω
. The default setting is
“pull-up/pull-down activated”. Only one device on the
RS485 bus needs to provide the pull-up/pull-down resis-
tances.
Jumpers D, E, F, and G: Defining the type of communication. Only jumper E is
set for RS485 communication.
Establishing an RS485 connection with a Sunny Boy inverter
Use only a 2 x 2 x 0.25 mm 2 LiYCY cable for the RS485 connection.
To enable RS485 communication between the Sunny Boy and the Sunny Boy Con-
trol, all devices must be equipped with an RS485 Piggy-Back. All devices can be or-
dered with this option already installed, or they can easily be retrofitted using op-
tional extension kits.
The maximum cable length for an RS485 connection is 1,200 m /
4,000 ft.