43 lines
1.9 KiB
Python
Executable File
43 lines
1.9 KiB
Python
Executable File
#!/usr/bin/env python3
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from time import sleep, time
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from sys import exit
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import minimalmodbus
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import serial
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slave_address_list = [ 252, 253 ]
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# read
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while True:
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for slave_address in slave_address_list:
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# initialize modbus
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instrument = minimalmodbus.Instrument('/dev/rs485', slave_address, close_port_after_each_call=True) # port name, slave address (in decimal)
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instrument.serial.baudrate = 115200
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instrument.serial.bytesize = 8
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instrument.serial.parity = serial.PARITY_EVEN
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instrument.serial.stopbits = 1
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instrument.serial.timeout = 0.05 # seconds
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instrument.mode = minimalmodbus.MODE_RTU # rtu or ascii mode
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instrument.clear_buffers_before_each_transaction = True
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try:
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CO2_addr = 9
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CO2 = instrument.read_register(CO2_addr, 1, functioncode=4) * 10
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T_SHT4x_addr = 10
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T_SHT4x = instrument.read_register(T_SHT4x_addr, 1, functioncode=4)
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RH_SHT4x_addr = 11
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RH_SHT4x = instrument.read_register(RH_SHT4x_addr, 1, functioncode=4) * 10
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T_SCD4x_addr = 12
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T_SCD4x = instrument.read_register(T_SCD4x_addr, 1, functioncode=4)
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RH_SCD4x_addr = 13
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RH_SCD4x = instrument.read_register(RH_SCD4x_addr, 1, functioncode=4) * 10
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T_SHT4x_signed_addr = 14
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T_SHT4x_signed = instrument.read_register(T_SHT4x_signed_addr, 1, functioncode=4, signed=True)
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T_SCD4x_signed_addr = 15
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T_SCD4x_signed = instrument.read_register(T_SCD4x_signed_addr, 1, functioncode=4, signed=True)
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with open(f'measurement_device_{slave_address}.csv', 'a+') as f:
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f.write(f'{time():.1f} {CO2} {T_SHT4x} {RH_SHT4x} {T_SCD4x} {RH_SCD4x} {T_SHT4x_signed} {T_SCD4x_signed}\n')
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except minimalmodbus.NoResponseError:
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print(f'Read error for device {slave_address} at {time()}')
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continue
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sleep(10)
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