
Sunny Boy 700
Technical Description
SB700-11:EE
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57
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SMA Regelsysteme GmbH
Installation (RS485)
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Read chapter 6.3.
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Connect pin 7 and pin 9 on the end of the cable that is connected to the interface
converter.
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If you are using a PC instead of a Sunny Boy Control, switch the interface con-
verter RS485/RS232 (ordering no. 39-0020) to “DTE“.
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The transmission cable is terminated on the last Sunny Boy on the cable. There a
termination resistor is connected by mounting a jumper (no. 1, jumper directly
above the terminal strip).
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Two resistors of 680 Ohm each must be integrated into the DB9 connection at the
beginning of the cable that is connected to the Sunny Boy Control or the PC. One
is soldered from pin 3 to pin 6, the other is soldered from pin 5 to pin 8 (see Fig.
6.6). These resistors are not required for communication with the Sunny Boy Con-
trol if the corresponding jumpers were plugged on.
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The recommended cable for the RS485 connection is a LIYCY 2 x 0.25 mm
twisted pair cable. It consists of four data lines of which two are each combined
to altogether two twisted pairs. Both pairs are surrounded by a single common
shield. Maximum length of the entire RS485 connection is 1200 m (4000 ft.). It
is essential to connect the outer shielding to protective earth (PE) on both ends.
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If necessary an adapter for the RS232 plug from the interface converter to the PC
(9-pin to 25-pin)