diff --git a/README.md b/README.md
index dc4ce48..792a8d0 100644
--- a/README.md
+++ b/README.md
@@ -34,16 +34,41 @@ Otherwise the connection fails.
 
 ### Library
 
+#### Use send (low level)
+
 ``` python
 from lmwsip import LmwSip
 
-lmwsip = LmwSip(ssl=True, host="sip-lmw.ad.rws.nl", port=443)
-lmwsip.send("LI user,pass\r")
-print("< [%s]" % (lmwsip.recv().strip('\r')))
-lmwsip.send("TI LMW\r")
-print("< [%s]" % (lmwsip.recv().strip('\r')))
-lmwsip.send("LO\r")
-print("< [%s]" % (lmwsip.recv().strip('\r')))
+sip = LmwSip(ssl=True, host="sip-lmw.rws.nl", port=443)
+sip.send("LI user,pass\r")
+print("< [%s]" % (sip.recv().strip('\r')))
+sip.send("TI LMW\r")
+print("< [%s]" % (sip.recv().strip('\r')))
+sip.send("LO\r")
+print("< [%s]" % (sip.recv().strip('\r')))
+```
+
+#### Use value
+
+``` python
+from lmwsip import LmwSip
+sip = LmwSip("USER", "PASS")
+print(sip.ti())
+print(sip.value("WN", "HOEK", "H10"))
+sip.logout()
+```
+
+#### Use timeseries
+``` python
+from lmwsip import LmwSip
+from datetime import datetime, timedelta
+from pprint import pprint
+
+end   = datetime.now()
+start = end - timedelta(hours=1)
+
+sip = LmwSip("USER", "PASS")
+pprint(sip.timeSerie("WN", "HOEK", "H10", start, end).ts)
 ```
 
 ### siprun
diff --git a/dumpserie b/dumpserie
new file mode 100755
index 0000000..74ab4c0
--- /dev/null
+++ b/dumpserie
@@ -0,0 +1,30 @@
+#!/usr/bin/env python3
+
+from lmwsip import LmwSip
+from datetime import datetime, timedelta
+from pprint import pprint
+
+def printLocPar(sip, proces, loc, par, start, end):
+    try:
+        r = sip.timeSerie(proces, loc, par, start, end)
+    except Exception as e:
+        print(e)
+    print("\n%s %s %s:\n" % (proces, loc, par))
+    pprint(r.ts)
+
+def main():
+    end   = datetime.now() + timedelta(minutes=10)
+    start = end - timedelta(hours=1)
+
+    try:
+        sip = LmwSip("<user>", "<pass>")
+    except Exception as e:
+        print(e)
+    
+    printLocPar(sip, "WN", "HOEK", "H10", start, end)
+    printLocPar(sip, "WN", "LEG1", "Czz10", start, end)
+    printLocPar(sip, "VW", "HOEK", "H10V", start, end)
+    printLocPar(sip, "AS", "HOEK", "H10A", start, end)
+
+if __name__ == "__main__":
+    main()
diff --git a/lmwsip.py b/lmwsip.py
index 73c8262..c44802e 100644
--- a/lmwsip.py
+++ b/lmwsip.py
@@ -8,6 +8,8 @@ import select
 import time
 import re
 import logging
+from datetime import datetime, timedelta
+from dateutil import tz
 
 class LmwSip:
     """Class to connect to the LMW Standard Interface prototcol (sip)
@@ -272,6 +274,77 @@ Returns a single string value or None
         #
         return(value)
 
+    def _lmwdelta_(self, window):
+        h = 24*window.days + window.seconds // 3600
+        m = (window.seconds % 3600)//60
+        return("+%02i:%02i" % (h, m))
+
+    def timeSerie(self, process, location, parameter,
+                        startTime, endTime, cmd_type="DATB"):
+        """timeSerie(process, location, parameter, startTime, endTime, cmd_type="DATA")
+
+Parameters:
+    process:      <WN|VW|AS>
+    location:     <lmw location (e.g. HOEK)>
+    parameter:    <lmw parameter (e.g. H10)>
+    startTime:    Start time (datetime)
+    endTime:      End time (datetime)
+    cmd_type:     [DATA|DATB]
+
+startTime is rounded up to the next measurement time.
+So 12:00:00.000001 --> 12:00:10.00.0
+
+The times should have correct timezone information. Otherwise local timezone
+is assumed. Timezones are converted to 'GMT+1' for the sip commands.
+
+Example:
+    lmw.data_string("WN", "HOEK", "H10", ...)
+ 
+Returns a LmwtimeSerie object
+
+Errors:
+    startTime > endTime
+    endTime - startTime > 24 hour
+    now - startTime < 30 days
+"""
+        startTime = startTime.astimezone(tz.gettz('GMT+1'))
+        endTime   = endTime.astimezone(tz.gettz('GMT+1'))
+
+        startTime += timedelta(microseconds=1000000-startTime.microsecond)
+        startTime += timedelta(seconds=60-startTime.second)
+        if (parameter.find("10") != -1):
+            if startTime.minute % 10 != 0:
+                delta = timedelta(minutes=10)
+                startTime += timedelta(minutes=(10-startTime.minute%10))
+        else:
+            delta = timedelta(minutes=1)
+
+        if startTime > endTime:
+            raise sipTimeSeriesError(startTime, endTime,
+                                     "starttime > endtime")
+        if datetime.now(tz=tz.gettz('GMT+1')) - startTime > timedelta(days=30): 
+            raise sipTimeSeriesError(startTime, endTime,
+                                     "now - starttime > 30 days")
+        if process == "VW":
+            cmd_type="DATA"
+
+        res = lmwTimeSerie(startTime, delta, "")
+
+        while startTime < endTime:
+            if endTime - startTime > timedelta(days=1):
+                window = timedelta(days=1) - delta
+            else:
+                window = endTime-startTime
+            values = self.cmd(process, location, parameter,
+                              self._lmwdelta_(window),
+                              startTime.strftime("%d-%m-%Y"),
+                              startTime.strftime("%H:%M"),
+                              cmd_type)
+            res.addvalues(startTime, values)
+            startTime += window + delta
+            
+        return(res)
+
     def logout(self):
         """logout()
 
@@ -280,6 +353,63 @@ Logs of
         self.send("LO\r")
         self.closesocket()
 
+class lmwTimeSerie:
+    """Class for lmw results.
+
+The result are in lmwTimeSerie.ts as array
+
+    [ <time1>, [<value1 a, value1 b, ...], kwaliteit1, additionele kwaliteit1],
+    [ <time2>, [<value2 a, value2 b, ...], kwaliteit2, additionele kwaliteit2],
+    ...
+
+Note:
+    * For most measurements there is only one value (e.g H10).
+    * Additionale kwaliteit is optional and may contain None.
+    * Result times in UTC
+
+"""
+
+    def __init__(self, start, delta, values=""):
+        """lmwTimeSerie(start, delta, values)
+
+Create a lmwTimeSerie object with:
+    start:  Start time
+    delta:  Period of the measurements
+    values: lmw result string
+"""
+        self.ts    = []
+        self.delta = delta
+        if values != "":
+            self.addvalues(start, values)
+
+    def addvalues(self, start, values):
+        """addvalues(start, delta, values)
+
+Add values to a timeserie
+    start:  Start time
+    delta:  Period of the measurements
+    values: lmw result string
+
+"""
+        start = start.astimezone(tz.gettz('UTC'))
+        for e in values.split(";"):
+            v = e.split("/")
+            v[0] = v[0].split(",")
+            if len(v) == 2:
+                v.append(None)
+            self.ts.append([start, v[0], v[1], v[2]])
+            start += self.delta
+
+class sipTimeSeriesError(Exception):
+    """Parameter errors for timeSeries"""
+    def __init__(self, startTime, endTime, message):
+        self.startTime = startTime
+        self.endTime   = endTime
+        self.message   = message
+
+    def __str__(self):
+        return("%s\n  starttime: %s\n  end time:  %s" %
+                              (self.message, self.startTime, self.endTime))
 
 class LmwSipConnectError(Exception):
     """Connection exceptions for LmwSip"""
@@ -298,13 +428,13 @@ class LmwLoginFailure(Exception):
         self.message = message
 
     def __str__(self):
-        return("Login with user %s failed: %s", self.user, self.message)
+        return("Login with user %s failed: %s" % (self.user, self.message))
 
 class LmwCmdWarn(Warning):
     """Exception fro LmwSip on a cmd"""
     def __init__(self, cmd, message):
-        self.cmd     = cmd
+        self.cmd     = cmd.replace('\r', '')
         self.message = message
 
     def __str__(self):
-        return("Cmd %s failed: %s", self.cmd, self.message)
+        return("Cmd %s failed: %s" %(self.cmd, self.message))
diff --git a/siprun b/siprun
index f74e0ed..d41a828 100755
--- a/siprun
+++ b/siprun
@@ -2,74 +2,46 @@
 
 import sys
 import getopt
+import argparse
 from lmwsip import LmwSip
 
-def usage():
-    print("siprun [-H] [-s] [-d <date>] [-t <time>] [-h <host>] [-p <port>] [<files>]")
-    print("\t-H: Show usage")
-    print("\t-s: SSL connection")
-    print("\t-d <date>: Date replacement string (2019-02-14)")
-    print("\t-t <time>: Time replacement string (17:00)")
-    print("\t-h <host>: Connect to host")
-    print("\t-p <port>: Connect to port")
-    print("\t-<files>: LMW commando files")
-
 def main():
+    lastTime=LmwSip.lasttime(None, "H10")
+    parser = argparse.ArgumentParser(description="Run a sip file.")
+    parser.add_argument("-u", "--unencrypted", action="store_true",
+                        help="Run a sip connection without ssl")
+    parser.add_argument("-H", "--host", action='store',
+                        default="sip-lmw.rws.nl",
+                        help="Host to connect to")
+    parser.add_argument("-p", "--port", action='store', type=int, default=443,
+                        help="Port to connect to")
+    parser.add_argument("-d", "--date", action='store',
+                        default=lastTime["day"],
+                        help="Date replacement string [DD-MM-YYYY]")
+    parser.add_argument("-t", "--time", action='store',
+                        default=lastTime["time_of_day"],
+                        help="Time replacement string [HH:MM]")
+    parser.add_argument("files", type=argparse.FileType('r'), nargs="+",
+                        help="Sip files to run")
+    args = parser.parse_args()
+
     try:
-        opts, args = getopt.getopt(sys.argv[1:], "sh:p:d:t:", ["help", "output="])
-    except getopt.GetoptError as err:
-        # print help information and exit:
-        print(err)  # will print something like "option -a not recognized"
-        usage()
-        sys.exit(2)
-    ssl=False
-    time=None
-    date=None
-    host=None
-    port=None
-    for o, a in opts:
-        if o == "-H":
-            usage()
-            sys.exit(0)
-        elif o == "-s":
-            ssl=True
-        elif o == "-d":
-            date=a
-        elif o == "-t":
-            time=a
-        elif o == "-h":
-            host=a
-        elif o == "-p":
-            port=a
-    if (host==None or port==None):
-        print("Set host and port")
-        usage()
-        sys.exit(3)
-    try:
-        lmwsip = LmwSip(ssl=ssl, host=host, port=port)
+        lmwsip = LmwSip(host=args.host, port=args.port,
+                        ssl=not args.unencrypted)
     except Exception as e:
         print("Connect to lmw failed: %s" % e)
         exit(1)
-    if (date == None or time == None):
-        # We assume a 10 minut interval so we use H10
-        r = lmwsip.lasttime("H10")
-        if (date == None):
-            date = r["day"]
-        if (time == None):
-            time = r["time_of_day"]
-    for cmdfile in args:
-        with open(cmdfile, "r") as f:
-            for cmd in f:
-                cmd = cmd.replace('{DATE}', date)
-                cmd = cmd.replace('{TIME}', time)
-                cmd = cmd.replace('\n', '\r')
-                print("> [%s]" % (cmd.strip('\r')))
-                try:
-                    lmwsip.send(cmd)
-                    print("< [%s]" % (lmwsip.recv().strip('\r')))
-                except:
-                    pass
-            f.close()
+    for f in args.files:
+        for cmd in f:
+            cmd = cmd.replace('{DATE}', args.date)
+            cmd = cmd.replace('{TIME}', args.time)
+            cmd = cmd.replace('\n', '\r')
+            print("> [%s]" % (cmd.strip('\r')))
+            try:
+                lmwsip.send(cmd)
+                print("< [%s]" % (lmwsip.recv().strip('\r')))
+            except:
+                pass
 
 if __name__ == "__main__":
     main()