2 files changed, 57 insertions, 0 deletions
diff --git a/usv/__init__.py b/usv/__init__.py
new file mode 100644
index 0000000..d48dae4
--- /dev/null
+++ b/usv/__init__.py
@@ -0,0 +1 @@
+from .usv import Usv
diff --git a/usv/usv.py b/usv/usv.py
new file mode 100644
index 0000000..14b8735
--- /dev/null
+++ b/usv/usv.py
@@ -0,0 +1,56 @@
+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