Sunny Island
Installation & Operating Instructions
BWRI33-12:EE
- 44 -
SMA Regelsysteme GmbH
COM3 is an RS232 interface used exclusively for service. A complete software up-
date for the system management processor or the control processor can be made
via COM3. In addition to a PC and a modem elimination cable this requires a soft-
ware tool available from Sam’s website.
3.6.1 Assignment of COM1 Interface (Three-Phase Operation)
In a three-phase island grid the COM1 interface is required for synchronization of the
three phases. The three Sunny Islands in one system have to be interconnected with
special 15-pin interface cables available as an accessory (SMA order name “SI-
Synckabel-Set“). The assignment of the SYNC BUS interface is shown in Table 3.2.
Each Sunny Island is equipped both with a plug connector (A) and a socket connec-
tor (B).
PIN
Plug connector A (RS485) top
Socket connector B (RS485) bottom
1
+5 V
+5 V
2 Sync
Sync
3 /Sync
/Sync
4 DO/DI
DO/DI
5 /DO/DI
/DO/DI
6 SPICLK
SPICLK
7 /SPICLK
/SPICLK
8 SPIMAOUT/SIN
SPIMAOUT/SIN
9 /SPIMAOUT/SIN
/SPIMAOUT/SIN
10 SPIMAIN/SOUT
SPIMAIN/SOUT
11 /SPIMAIN/SOUT
/SPIMAIN/SOUT
12
AB CONFIG A
GND
13
GND
AB CONFIG E
14 GND
GND
15 GND
GND
Table 3.2: Assignment of COM1 (SYNC BUS) interface
