modbus_test.py

import minimalmodbus
from serial.tools import list_ports


for d in list_ports.comports():
    if d.description.startswith('USB Serial'):
        device = d.device


class RM_PP03:
    def __init__(self, device):
        self.modbus = minimalmodbus.Instrument(device, 1)
        self.modbus.serial.baudrate = 115200
        self.modbus.serial.timeout = 0.3

    def get_volts(self):
        return self.modbus.read_register(0, 3, 4, True)
    
    def get_peak_volts(self):
        return self.modbus.read_register(1, 3, 4, True)
    
    def get_current(self):
        return self.modbus.read_register(2, 3, 4, True)
    
    def get_peak_currrent(self):
        return self.modbus.read_register(3, 3, 4, True)
    
    def set_out_enable(self):
        self.modbus.write_bit(0, 1, 5)
        
    def set_out_disable(self):
        self.modbus.write_bit(0, 0, 5)
    
    def get_out_status(self):
        return self.modbus.read_bit(0, 1)
        
    def set_eb_disable(self):
        self.modbus.write_bit(1, 0, 5)
        
    def get_eb_status(self):
        return self.modbus.read_bit(1, 1)
    
    def set_output(self, way, level):
        if not 0 <= level <= 32767:
            raise ValueError('出力範囲(0-32767)を満たしてください')
        if not type(way) is bool:
            raise ValueError('方向は真(順方向)偽(逆方向)をboolで与えてください')
        
        if not way:
            level *= -1

        self.modbus.write_register(0, level, 0, 6, True)
        print('register: ', self.modbus.read_register(0, 0, 3))


pp03 = RM_PP03(device)

pp03.set_eb_disable()
pp03.set_out_enable()

print('out: ', pp03.get_out_status())
print('eb: ', pp03.get_eb_status())

way = True
while True:
    level = input('Level(0-32767): ')
    # なにも入力しなかった場合は方向転換
    if level == '':
        way = not way
        
    try:
        level = int(level)
    except ValueError:
        continue

    pp03.set_output(way, level)
    print('level: ', level)
    print('volts: ', pp03.get_volts())
    print('current: ', pp03.get_current())