def __init__(self):
self.power = Power()
self.L1 = Phase()
self.L2 = Phase()
self.L3 = Phase()
self.tariff_1 = Tariff()
self.tariff_2 = Tariff()
self.frequency = float('nan')
def test_add():
p1 = Power(1, 1, 1)
p2 = Power(1, 1, 1)
p_total = p1 + p2
assert isinstance(p_total, Power)
assert p_total.apparent == p1.apparent + p2.apparent
assert p_total.active == p1.active + p2.active
assert p_total.reactive != p1.reactive + p2.reactive
assert p_total.reactive == sqrt((p2.apparent + p1.apparent)**2 -
(p2.active + p1.active)**2)
def test_sub():
# Reactive power values shouldn't matter -> setting them here to something absurd.
p2 = Power(3, 2, 3)
p1 = Power(2, 1, 4)
p_total = p2 - p1
assert isinstance(p_total, Power)
assert p_total.apparent == p2.apparent - p1.apparent
assert p_total.active == p2.active - p1.active
assert p_total.reactive != p2.reactive - p1.reactive
assert p_total.reactive == sqrt((p2.apparent - p1.apparent)**2 -
(p2.active - p1.active)**2)
def test_mul():
p1 = Power(1000, 1000, 1000)
p_total = p1 * 7200
assert isinstance(p_total, Energy)
assert p_total.apparent == 1000 * 2
assert p_total.active == p1.active * 2
assert p_total.reactive == p1.reactive * 2
p_total = p1 * timedelta(minutes=30)
assert isinstance(p_total, Energy)
assert p_total.apparent == 1000 / 2
assert p_total.active == p1.active / 2
assert p_total.reactive == p1.reactive / 2
class PAC(object):
_master = None
_unit = None
def __init__(self):
self.power = Power()
self.L1 = Phase()
self.L2 = Phase()
self.L3 = Phase()
self.tariff_1 = Tariff()
self.tariff_2 = Tariff()
self.frequency = float('nan')
def _from_float(self, values):
return [unpack(str('>f'), pack(str('>HH'), *values[i:i + 2]))[0] for i in range(0, len(values), 2)]
def _from_double(self, values):
return [unpack(str('>d'), pack(str('>HHHH'), *values[i:i + 4]))[0] for i in range(0, len(values), 4)]
def read_input_register(self, register_start, count=1):
if self._master is None or self._unit is None:
raise ValueError('Connection uninitialized.')
result = self._master.execute(self._unit, READ_INPUT_REGISTERS, register_start, count)
if not result:
raise IOError('Register read failed.')
return result
def read_power(self):
self.power = Power(*self._from_float(self.read_input_register(63, 4)))
def read_phases(self):
values = self._from_float(self.read_input_register(1, 30))
# Note: PAC reports phase powers as NaN, if all phases aren't connected.
# However, the total power read with PAC.read_power() is seems valid even then.
self.L1 = Phase(values[0], values[6], values[9], values[12])
self.L2 = Phase(values[1], values[7], values[10], values[13])
self.L3 = Phase(values[2], values[8], values[11], values[14])
def read_frequency(self):
self.frequency = self._from_float(self.read_input_register(55, 2))[0]
def read_energy(self):
values = self._from_double(self.read_input_register(801, 40))
self.tariff_1 = Tariff(
Energy(values[8], values[0], values[4]),
Energy(values[8], values[2], values[6])
)
self.tariff_2 = Tariff(
Energy(values[9], values[1], values[5]),
Energy(values[9], values[3], values[7])
)
def read(self):
self.read_power()
self.read_phases()
self.read_frequency()
self.read_energy()
def clear_tariff(self, tariff):
if self._master is None or self._unit is None:
raise ValueError('Connection uninitialized.')
if tariff == 1:
start = 801
if tariff == 2:
start = 805
registers = range(start, start + 5 * 8, 8)
for x in registers:
self._master.execute(self._unit, WRITE_MULTIPLE_REGISTERS, x, output_value=[0, 0, 0, 0])
# Read energy to update values...
self.read_energy()
def close(self):
if self._master is None or self._unit is None:
return
self._master.close()
@property
def energy(self):
return self.tariff_1 + self.tariff_2
@property
def energy_balance(self):
return self.tariff_1.energy_import + self.tariff_2.energy_import - self.tariff_1.energy_export - self.tariff_2.energy_export
def as_dict(self, replace_nan=False):
return {
'power': self.power.as_dict(replace_nan=replace_nan),
'phases': {
'L1': self.L1.as_dict(replace_nan=replace_nan),
'L2': self.L2.as_dict(replace_nan=replace_nan),
'L3': self.L3.as_dict(replace_nan=replace_nan),
},
'energy': self.energy.as_dict(replace_nan=replace_nan),
'balance': self.energy_balance.as_dict(replace_nan=replace_nan),
'tariffs': [
self.tariff_1.as_dict(replace_nan=replace_nan),
self.tariff_2.as_dict(replace_nan=replace_nan),
],
'frequency': zero_if_nan(self.frequency, replace_nan),
}
def read_power(self):
self.power = Power(*self._from_float(self.read_input_register(63, 4)))
