diff --git a/enums.py b/enums.py
new file mode 100644
index 0000000..f864d76
--- /dev/null
+++ b/enums.py
@@ -0,0 +1,23 @@
+#!/usr/bin/env python3
+
+# SPDX-FileCopyrightText: 2020 Andrius Štikonas <andrius@stikonas.eu>
+# SPDX-License-Identifier: LGPL-3.0-or-later
+
+import enum
+
+
+class ScheduleFormat(str, enum.Enum):
+    """
+    Enum to specify Schedule Format
+    ZERO  - non programmable (time clocks cannot be non programmable)
+    ONE   - same format every day of the week
+    TWO   - 5 day / 2 day
+    SEVEN - 7 day (every day different)
+
+
+    """
+
+    ZERO = "NONPROGRAMMABLE"
+    ONE = "24HOURSFIXED"
+    TWO = "5DAY/2DAY"
+    SEVEN = "7DAY"
diff --git a/neohub.py b/neohub.py
index 7993282..a181d7b 100644
--- a/neohub.py
+++ b/neohub.py
@@ -5,8 +5,10 @@ import asyncio
 import json
 import logging
 
+from enums import ScheduleFormat
 from system import System
 
+
 class NeoHub:
     def __init__(self):
         self._logger = logging.getLogger('neohub')
@@ -122,14 +124,11 @@ class NeoHub:
         return result
 
 
-    async def set_format(self, format):
+    async def set_format(self, format: ScheduleFormat):
         """
-        Sets timer format
+        Sets schedule format
 
-        "NONPROGRAMMABLE" - non programmable (time clocks cannot be non programmable)
-        "24HOURSFIXED" - same format every day of the week
-        "5DAY/2DAY" - 5 day / 2 day
-        "7DAY"      - 7 day (every day different)
+        Format is specified using ScheduleFormat enum:
         """
 
         message = {"SET_FORMAT": format}
diff --git a/system.py b/system.py
new file mode 100644
index 0000000..eee146e
--- /dev/null
+++ b/system.py
@@ -0,0 +1,35 @@
+#!/usr/bin/env python3
+
+# SPDX-FileCopyrightText: 2020 Andrius Štikonas <andrius@stikonas.eu>
+# SPDX-License-Identifier: LGPL-3.0-or-later
+
+from enums import ScheduleFormat
+
+
+def schedule_format(int_format):
+    if int_format == 0:
+        return ScheduleFormat.ZERO
+    elif int_format == 1:
+        return ScheduleFormat.ONE
+    elif int_format == 2:
+        return ScheduleFormat.TWO
+    elif int_format == 4:
+        return ScheduleFormat.SEVEN
+    else:
+        raise ValueError('Unrecognized ScheduleFormat')
+
+
+class System:
+    def __init__(self, system_info):
+        self.dst_auto = system_info['DST_AUTO']
+        self.dst_on = system_info['DST_ON']
+        self.timer_format = schedule_format(system_info['FORMAT'])
+        # If system timer format is set to non programmable, then any time clock remain
+        # in the previous setting which is stored in ALT_TIMER_FORMAT.
+        self.alt_timer_format = schedule_format(system_info['ALT_TIMER_FORMAT'])
+        self.ntp = system_info['NTP_ON'] == "Running"
+        self.hub_type = system_info['HUB_TYPE']
+        self.hub_version = system_info['HUB_VERSION']
+        self.temperature_unit = system_info["CORF"]
+        self.timezone = system_info['TIME_ZONE']
+        self.time = system_info['UTC']
diff --git a/test.py b/test.py
index 6bb042f..3f35a2f 100755
--- a/test.py
+++ b/test.py
@@ -8,13 +8,14 @@ import asyncio
 import neohub
 import logging
 
+from enums import ScheduleFormat
 
 async def run():
     hub = neohub.NeoHub()
     await hub.connect()
     system = await hub.get_system()
     print(vars(system))
-    result = await hub.set_format("NONPROGRAMMABLE")
+    result = await hub.set_format(ScheduleFormat.ZERO)
     print(result)