SMA Sunny Boy Control - Manual (Page 35)

Sunny Boy Control
SMA Technologie AG
User Manual SUNBC-14:NE0206 31
3.2.2 RS485 Connection Between a PC and a Sunny Boy
Control
PC
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Sunny Boy
Control
RS232
PAC 1273 W
max. 50
RS485 / RS232
interface converter
RS485
Fig. 3.13: RS485 connection to a PC
To overcome long distances, for example, it can be useful to connect an RS485 inter-
face to the "PC (COM2)" connector of the Sunny Boy Control. Compared with
RS232, which allows a maximum cable length of approx 15 m / 50 ft, RS485 allows
a total cable length of 1,200 m / 4,000 ft.
To establish an RS485 connection with a PC, you will need an RS485 Piggy-Back
installed to the Sunny Boy Control and an external RS232-RS485 interface converter.