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import re
from serial import Serial
parameters = {
'acvoltsin': (1, '01 V In +([0-9]+[.]?[0-9]*)'),
'acvoltsout': (2, '02 V Out +([0-9]+[.]?[0-9]*)'),
'vaout': (5, '05 VA Out +([0-9]+[.]?[0-9]*)'),
'vbattery': (7, '07 V Batt +([0-9]+[.]?[0-9]*)'),
'frequency': (8, '08 Freq ([0-9]+[.]?[0-9]*) Hz'),
'fullload': (16, '16 FullLoad% ([0-9]+[.]?[0-9]*)'),
'watts': (17, '17 Watts +([0-9]+[.]?[0-9]*)'),
'powerfactor': (18, '18 PF +([0-9]+[.]?[0-9]*) ----'),
'crestfactor': (19, '19 CrestF +([0-9]+[.]?[0-9]*)'),
'powerout': (20, '20 #PwrOut +([0-9]+[.]?[0-9]*)'),
'inverterminutes': (23, '23 InvMin +([0-9]+[.]?[0-9]*)')
}
class UsvSerialHandler(object):
def __init__(self, device_path):
""" Handles the serial connection to the usv """
self._serial_port = Serial(device_path,
baudrate=600,
timeout=0.8)
# force clean prompt
self._serial_port.write('\r')
self._serial_port.read(100)
def request(self, index):
""" Write and read until prompt """
self._serial_port.write('d {}\r'.format(index))
return self._serial_port.read(21)
class Usv(UsvSerialHandler):
def __init__(self, device_path):
super().__init__(device_path)
def read(self):
fields = {}
for name, (index, regex) in parameters.items():
result = self.request(index)
match = re.search(regex, result, re.MULTILINE)
if match:
value = float(match.group(1))
fields[name] = value
return fields
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