uart/modbus_rtu/brainchild_io_16do/brainchild-io-16do-activity.py

   1 import time
   2
   3 import minimalmodbus
   4
   5 minimalmodbus.PARITY= 'E'
   6
   7 connection = minimalmodbus.Instrument("/dev/ttyUSB0", 1)
   8
   9 while True:
  10     try:
  11         time.sleep(.05)
  12
  13         # function 1
  14         a = connection.read_bit(3, functioncode=1)
  15
  16         # function 2
  17         b = connection.read_bit(0, functioncode=2)
  18
  19         # function 3
  20         connection.read_register(99, functioncode=3)
  21
  22         # function 4
  23         connection.read_register(120, functioncode=4)
  24
  25         # funciton 5
  26         connection.write_bit(3, True, functioncode=5)
  27
  28         # function 6
  29         connection.write_register(1, 0b01010101, functioncode=6)
  30
  31         # function 15
  32         connection.write_bit(2, True, functioncode=15)
  33
  34         # function 16
  35         connection.write_register(1, 0b10101010, functioncode=16)
  36
  37     except IOError:
  38         pass