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Fixed character as preamble to indicate start of package
Destination address byte
Source address byte
Command byte
Size byte
Data payload
Simple checksum byte, the sum of previous bytes
Carriage return character
The package is minimum 7 bytes and maximum 262 bytes in size. DATA is
transmitted only if NBYTES is nonzero.
Example: Send 2 bytes from PC to Electronic Load.
SYNC
U
0x55
ADDRESS
E
0x45
SENDER
P
0x50
COMMAND
C
0x43
NBYTES
2
0x02
DATA
int mA
0x04B0
CS
Calc
0xE3
CR
?
0x0D
14.1.1 Source and destination ADDRESS.
Address (ASCII)
C
D
E
M
P
S
Address (hex)
0x43
0x44
0x45
0x4D
0x50
0x53
HW Module
Charger
DB101 Display
Electronic Load
Main Controller
PC
SB20x
14.2 Global COMMAND
The commands for the different hardware modules are covered in the sections below.
Commands can be uses in both read and write mode: if a command code (ASCII) is
sent as upper case it is a WRITE, and if in lower case it is a READ. Each module has
its own unique commands (commands not shared for different hardware modules).
In the following explanations, the COMMAND is marked yellow.
14.3 COMMAND to Constant Current Load.
The Constant Current Load only supports write commands: It is implemented with a
14-bit DAC and the Board Controller will process the requested current level to
achieving the correct current level for the Constant Current Load.
The Board Controller will also monitor the PCB temperature and shut off the Constant
Current Load if the PCB temperature is higher than 125°C.
Example: Set Constant Current Load to 2450mA
SYNC
U
0x55
ADDRESS
E
0x45
SENDER
P
0x50
COMMAND
C
0x43
NBYTES
2
0x02
DATA
int mA
0x0992
CS
Calc
0xCA
CR
?
0x0D
10
AVR459
8132A-AVR-10/08
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