SMA Sunny Island 4248U, Installation & Operating Instructions Manual

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Installation SI4248U Manual
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Serial Port
The Serial Port is used to communicate with external metering devices such as the Sunny Boy
Control. Use of this port requires that the optional communications Piggy-Back unit be installed.
This port can be configured for RS485 or RS232 formats.
Controller Area Network (CAN)
The CAN connections are used when two Sunny Island 4248U’s are used in split-phase
configuration. Please see the split-phase section of this manual for further details.
Terminal RS485 RS232
2 A + RXD
3 not used TXD
5 GND GND
7 B - not used
Table 1-6: Serial Port
Terminal Function
SHIELD Communication cable shield
CAN_H CAN Bus High
C_GND CAN Bus Common
CAN_L CAN Bus Low
Table 1-7: Controller Area Network (CAN)