VCS II User Guide – Bergey WindPower Co.
Rev: 0
June 17, 2016
12
VCS II Can Bus Interface
The CAN Bus utilizes an isolated input to provide a galvanic isolation rating of 2500 V
RMS
. An RJ45
connection (CN20) is provided on the controller with a pinout of:
Pin 1 – NC
Pin 2 – NC
Pin 3 – V+
Pin 4 – CANH
Pin 5 – CANL
Pin 6 – GND
Pin 7 – NC
Pin 8 - NC
VCS II CAN Bus Message Specification
1.
The baud rate is fixed to 250k.
2.
“Little endian” is used for CAN transmission — least significant byte is
transmitted/received first.
3.
Only standard identifier (11bit) is supported.
4.
Message ID Specifications:
Message
ID
Request
Response
Comment
1
DLC: 1
Mailbox 0 is reserved
to receive this
message.
DLC: 1
Mailbox 16 is reserved
to echo back the
original message
This message is for command:
1 = Start (Reset), 0 = Stop.
•
If the system is in regular charge
or equalizer mode, the “Stop”
command will stop the system
operation.
•
If the system is in stop mode, the
“Start” command will start the
system.
•
If the system is in fault state, the
“Start(Reset” command will clear
the fault and prepare the system to
go to run state.
2
DLC: 4
Mailbox 1 is reserved
to receive this
message.
Data format: single
precision float.
DLC: 4
Mailbox 17 is reserved
to echo back the
original message.
Data format: single
precision float.
This message sets the battery
regulation voltage for normal
operation.
