SMA Sunny Boy 3000US - Communication Module

RS-485 Piggy-Back
Communication Module
Signal Symmetry and
Termination Jumpers
Terminal Block for
RS-485 Connections
Jumpers B & C Installed:Installing these jumpers puts 680
Ohm symmetry resistors between
pin 2 (Data+) and +5V and be-
tween pin 7 (Data-) and Ground.
Jumper A installed: Installing this jumper puts a 120
Ohm termination resistor across
pin 2 (Data+)and pin 7 (Data-).
NOTE: Install jumpers B & C after the inverter is on th
RS-485 bus and only if symmetry of the sign
a
is required. (Symmetry is already provided b
the Sunny Boy Control and Sunny WebBox
products).
Install jumper A only, if the inverter is on on
e
of the ends of the RS-485 bus.
Wiring the Sunny Boy Communication Wiring
5-26 SMA America SB3000US-4000US-11-SE1607
Figure 5-13 Detail of RS-485 Termination and Jumper Settings
RS-485 Pinouts
2 - A (+) (Data+)
7 - B (-) (Data-)
5 - SR (Signal Ref.)