Index: dialin/common/__init__.py
===================================================================
diff -u -rb543d90a50cbef509d10f4c1412d87bf6eee2e4e -r86be1988d90d18b66a746d76eb144c778be0b6b5
--- dialin/common/__init__.py	(.../__init__.py)	(revision b543d90a50cbef509d10f4c1412d87bf6eee2e4e)
+++ dialin/common/__init__.py	(.../__init__.py)	(revision 86be1988d90d18b66a746d76eb144c778be0b6b5)
@@ -1,2 +1,3 @@
 from .alarm_defs import AlarmList, AlarmPriorities
-from .msg_defs import MsgIds
\ No newline at end of file
+from .msg_defs import MsgIds
+from .prs_defs import Ranges
\ No newline at end of file
Index: dialin/common/prs_defs.py
===================================================================
diff -u
--- dialin/common/prs_defs.py	(revision 0)
+++ dialin/common/prs_defs.py	(revision 86be1988d90d18b66a746d76eb144c778be0b6b5)
@@ -0,0 +1,21 @@
+class Ranges:
+    PRESSURE_STEPS = 10
+
+    ARTERIAL_PRESSURE_MINIMUM = -400
+    ARTERIAL_PRESSURE_MAXIMUM = +600
+    ARTERIAL_PRESSURE_LOW_MIN = -300
+    ARTERIAL_PRESSURE_LOW_DEF = -300
+    ARTERIAL_PRESSURE_LOW_MAX = +200
+    ARTERIAL_PRESSURE_HIGH_MIN = -300
+    ARTERIAL_PRESSURE_HIGH_DEF = +100
+    ARTERIAL_PRESSURE_HIGH_MAX = +200
+
+    VENOUS_PRESSURE_MINIMUM = -100
+    VENOUS_PRESSURE_MAXIMUM = +700
+    VENOUS_PRESSURE_LOW_MIN = -100
+    VENOUS_PRESSURE_LOW_DEF = -100
+    VENOUS_PRESSURE_LOW_MAX = +600
+    VENOUS_PRESSURE_HIGH_MIN = +100
+    VENOUS_PRESSURE_HIGH_DEF = +400
+    VENOUS_PRESSURE_HIGH_MAX = +600
+