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4.3 Connection to a Sunny Boy Control
(Light, Standard, Plus) using RS-232
The RS-232 interface is intended to connect a correspondingly equipped Sunny Boy
Control using an RS-232 connection for cable lengths up to 15 m max.
Important Notice:
The Sunny Boy Control must be configured for operation with
the large display panel.
Settings: Display type HvG, baud rate 2400
(for details, see Sunny Boy Control Operating Instructions, section 'Terminals', key-
word 'large display panel' and keyword 'communication')
4.3.1 Connection information
The included supply is connected with correct polarity to
terminals 1 and 2
. If the
power supply cable needs to be lengthened, the wires should have about a 0.75 mm
2
cross section. Please note that the power supply must only be used in dry places!
The RS-232 output (COM 2 or 3) of the Sunny Boy Control is connected to
terminals 3
and 4
. A shielded cable must be used to connect to the Sunny Boy Control. The size of
the cable is not important.
RxD
of the large display panel (terminal 3) is connected to TxD (COM2/3 pin 3) of the
Sunny Boy Control.
GND
of the large display panel (terminal 4) is connected to TxD (COM2/3 pin 5) of the
Sunny Boy Control.
The shield is connected only to 0V (terminal 2) of the large display panel and remains
open on the Sunny Boy Control side.
