Hi
I'm trying to communicate with the NIRscan nano over the UART expansion connector.
I've written a python script which can open, close, write and write over the COM port to which i attached the NIRscan.
But I'm struggling with defining the bytes I have to send over to get a useful response.
Right now I'm just trying to get any response such that I can confirm that my setup is working.
According tot he documentation i need to send the following:
- Start bytes 65 66 67 68
- Checksum bytes ?? ?? ?? ??
- Flag bytes 11????0
- Sequence ??
- Length ??
- Command ?? ??
- Data 42 (I want to perform a 'Read file list')
- End bytes 68 67 66 65
import serial
import time
ser = serial.Serial(
port='COM6',
baudrate=115200,
parity=serial.PARITY_NONE,
stopbits=serial.STOPBITS_ONE,
bytesize=serial.EIGHTBITS,
timeout=1
)
ser.flushInput()
ser.flushOutput()
if ser.is_open == 1:
print("Port is open")
start_bytes = bytearray([65, 66, 67, 68])
ser.write(start_bytes)
checksum_bytes = bytearray([0, 0, 0, 0])
ser.write(checksum_bytes)
flag_byte = 112
ser.write(flag_byte)
sequency_byte = 0
ser.write(sequency_byte)
length_bytes = bytearray([0, 0])
ser.write(length_bytes)
command_bytes = bytearray([42, 0])
ser.write(command_bytes)
data_bytes = bytearray([0, 0, 0, 0])
ser.write(data_bytes)
end_bytes = bytearray([68, 67, 66, 65])
ser.write(end_bytes)
print("Data sent")
print(ser.read())
ser.close()
if ser.is_open == 0:
print("Port is closed")
