樹莓派python工業數據采集系統

*DAQM-4206–>CBT-1009—>樹莓派

#!/usr/bin/env python # -*- coding: utf_8 -*- # DAQM-4206 測試程序,樹莓派4B/3B....,CBT-1009 import serial import modbus_tk import modbus_tk.defines as cst from modbus_tk import modbus_rtu import timedef sleeptime(hour, min, sec):return hour * 3600 + min * 60 + sec second = sleeptime(0, 0, 1) master = modbus_rtu.RtuMaster(serial.Serial('/dev/ttyUSB0', baudrate=9600, bytesize=8, parity='N', stopbits=1,xonxoff=0)) master.set_timeout(2.0) master.set_verbose(True)while True:data = master.execute(1, cst.READ_HOLDING_REGISTERS, 256, 8) time.sleep(second)index = 0temp= [0 for i in range(len(data ))]for index in range(len(data )):temp[index ] = data[index ]/4095.0*20.0print(temp) #打印結果DAQM-4206采集工業4~20MA信號， CBT-1009是隔離型USB轉485輸出結果：[15.789987789987789, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] [15.789987789987789, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] [15.789987789987789, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] [15.789987789987789, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] [15.789987789987789, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] [15.789987789987789, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] [15.794871794871794, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] [15.789987789987789, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] [15.789987789987789, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] [15.789987789987789, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] [15.789987789987789, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] [15.789987789987789, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] [15.794871794871794, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] [15.789987789987789, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] [15.789987789987789, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] [15.789987789987789, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] [15.789987789987789, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] [15.789987789987789, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] [15.794871794871794, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] [15.794871794871794, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] [15.794871794871794, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] [15.794871794871794, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] [15.794871794871794, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]

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