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RS485 Communication Terminal: (RJ45 port) follow MODBUS 485 protocol, for
communication between battery system and inverter.
CAN Communication Terminal: (RJ45 port) follow CAN protocol, for communication between
battery system and inverter.
RS232 Communication Terminal: (RJ45 port) for manufacturer or professional engineer to
debug or service. The Pin1&2(12Vdc+/-) is dedicated for Sunny Boy Storage Enable Line
design.
Link0/Link1 Communication Terminal: （RJ45 port）for multi-groups operation using only,
connecting from first BMS Link 1 to second BMS Link 0, then from second BMS Link 1 to third
BMS link 0(if has), all the way to the last BMS Link 0. The BMS with Link Port 0 EMPTY is
defined as the Master string, which further communication with the inverter or upper
controller.
For multi-groups operation, please firstly make sure the communication cable between
multiple BMSs are properly connected between Link 1 and Link 0, before the start up.
Definition of RJ45 Port Pin
CAN
No.
1
GND
2
3
CANH
4
CANL
5
6
7
8
*
The Pin1&2(12Vdc IN+/ 12Vdc IN-) is dedicated for SMA Enable Line design.
2.3 System Diagram
RS485
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RS485A
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RS485B
RS232
12Vdc IN+*
12Vdc IN-*
TX
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RX
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GND
17
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