104 lines
3.2 KiB
Python
Executable File
104 lines
3.2 KiB
Python
Executable File
'''
|
|
Script to get NPM data via Modbus
|
|
need parameter: port
|
|
/usr/bin/python3 /var/www/nebuleair_pro_4g/NPM/get_data_modbus.py ttyAMA5
|
|
|
|
Modbus RTU
|
|
[Slave Address][Function Code][Starting Address][Quantity of Registers][CRC]
|
|
|
|
Pour récupérer les 5 cannaux (a partir du registre 0x80)
|
|
|
|
Request
|
|
\x01\x03\x00\x80\x00\x0A\xE4\x1E
|
|
|
|
\x01 Slave Address (slave device address)
|
|
\x03 Function code (read multiple holding registers)
|
|
\x00\x80 Starting Address (The request starts reading from holding register address 0x80 or 128)
|
|
\x00\x0A Quantity of Registers (Requests to read 0x0A or 10 consecutive registers starting from address 128)
|
|
\xE4\x1E Cyclic Redundancy Check (checksum )
|
|
|
|
'''
|
|
|
|
import serial
|
|
import requests
|
|
import json
|
|
import sys
|
|
import crcmod
|
|
|
|
parameter = sys.argv[1:] # Exclude the script name
|
|
#print("Parameters received:")
|
|
port='/dev/'+parameter[0]
|
|
|
|
ser = serial.Serial(
|
|
port=port,
|
|
baudrate=115200,
|
|
parity=serial.PARITY_EVEN,
|
|
stopbits=serial.STOPBITS_ONE,
|
|
bytesize=serial.EIGHTBITS,
|
|
timeout = 0.5
|
|
)
|
|
|
|
# Define Modbus CRC-16 function
|
|
crc16 = crcmod.predefined.mkPredefinedCrcFun('modbus')
|
|
|
|
# Request frame without CRC
|
|
data = b'\x01\x03\x00\x80\x00\x0A'
|
|
|
|
# Calculate CRC
|
|
crc = crc16(data)
|
|
crc_low = crc & 0xFF
|
|
crc_high = (crc >> 8) & 0xFF
|
|
|
|
# Append CRC to the frame
|
|
request = data + bytes([crc_low, crc_high])
|
|
print(f"Request frame: {request.hex()}")
|
|
|
|
ser.write(request)
|
|
|
|
while True:
|
|
try:
|
|
byte_data = ser.readline()
|
|
formatted = ''.join(f'\\x{byte:02x}' for byte in byte_data)
|
|
print(formatted)
|
|
|
|
# Extract LSW (first 2 bytes) and MSW (last 2 bytes)
|
|
lsw_channel1 = int.from_bytes(byte_data[3:5], byteorder='little')
|
|
msw_chanel1 = int.from_bytes(byte_data[5:7], byteorder='little')
|
|
raw_value_channel1 = (msw_chanel1 << 16) | lsw_channel1
|
|
|
|
lsw_channel2 = int.from_bytes(byte_data[7:9], byteorder='little')
|
|
msw_chanel2 = int.from_bytes(byte_data[9:11], byteorder='little')
|
|
raw_value_channel2 = (msw_chanel2 << 16) | lsw_channel2
|
|
|
|
lsw_channel3 = int.from_bytes(byte_data[11:13], byteorder='little')
|
|
msw_chanel3 = int.from_bytes(byte_data[13:15], byteorder='little')
|
|
raw_value_channel3 = (msw_chanel3 << 16) | lsw_channel3
|
|
|
|
lsw_channel4 = int.from_bytes(byte_data[15:17], byteorder='little')
|
|
msw_chanel4 = int.from_bytes(byte_data[17:19], byteorder='little')
|
|
raw_value_channel4 = (msw_chanel1 << 16) | lsw_channel4
|
|
|
|
lsw_channel5 = int.from_bytes(byte_data[19:21], byteorder='little')
|
|
msw_chanel5 = int.from_bytes(byte_data[21:23], byteorder='little')
|
|
raw_value_channel5 = (msw_chanel5 << 16) | lsw_channel5
|
|
|
|
print(f"Channel 1 (0.2->0.5): {raw_value_channel1}")
|
|
print(f"Channel 2 (0.5->1.0): {raw_value_channel2}")
|
|
print(f"Channel 3 (1.0->2.5): {raw_value_channel3}")
|
|
print(f"Channel 4 (2.5->5.0): {raw_value_channel4}")
|
|
print(f"Channel 5 (5.0->10.): {raw_value_channel5}")
|
|
|
|
|
|
|
|
break
|
|
except KeyboardInterrupt:
|
|
print("User interrupt encountered. Exiting...")
|
|
time.sleep(3)
|
|
exit()
|
|
except:
|
|
# for all other kinds of error, but not specifying which one
|
|
print("Unknown error...")
|
|
time.sleep(3)
|
|
exit()
|
|
|