- 115200 baud
- one stop bit
- no parity
5a0071050000dc07a5
## -> start
## -> request
#### -> command
#### -> request payload length
#### -> crc: modbus
## -> end
5aff7105000c0000000000000000017e4cc02057a5
## -> start
## -> response
#### -> response to command
#### -> response payload length
######################## -> payload
#### -> crc: modbus
## -> end
See prpd_usb/schema.py for known payloads