Hello Jim Beans，
Thanks for writing in.
The electrical level from this item is TTL,to communicate with compueter. Fistly you need to conver TTL to RS232.
Communication protocol is as followed:
Baud rate: 9600 Bps
BB CC ADDR 00 XX XX CRC (commandfor current return )
BB CC ADDR 01 XX XX CRC (commandfor voltage return )

BB CC is the frame head (2 bytes)
ADDR is the module address (1 bytes)
00 is to read the current command (1 bytes)
01 is to read the voltage command (1 bytes)
XX XX is arbitrary value (2 bytes)

Best regards.