--- a/iec1107.py	Wed Nov 20 23:26:45 2013 +1030
+++ b/iec1107.py	Wed Nov 20 23:44:55 2013 +1030
@@ -30,6 +30,7 @@
 
 import datetime
 import exceptions
+import optparse
 import re
 import serial
 import sys
@@ -153,41 +154,19 @@
         return 'Time: %s, Meter: %s, Import: %d Wh, Export: %d Wh' % (self.readdate.strftime('%Y/%m/%d %H:%M'),
                                                              self.meterid, self.importWh, self.exportWh)
 def main():
-    if len(sys.argv) != 2:
-        print 'Bad usage'
-        print '\t%s portname' % (sys.argv[0])
-        sys.exit(1)
+    parser = optparse.OptionParser(usage = 'usage: %prog [options] port',
+                                   epilog = 'Read out from an IEC1107 meter')
+    parser.add_option('-r', '--rrd', dest = 'rrd', action = 'store_true', default = False, help = 'Output in a format suitable for rrdtool')
+    (opt, args) = parser.parse_args()
+    if len(args) != 1:
+        parser.error('Need to specify port')
 
-    res = IEC1107Reading(sys.argv[1])
-    print res
+    res = IEC1107Reading(args[0])
+    if opt.rrd:
+        print '%s:%d:%d' % (res.readdate.strftime('%s'), res.importWh, res.exportWh)
+    else:
+        print res
 
 if __name__ == '__main__':
     main()
 
-# Meter number is 1288004
-# 1.8.0 is import
-# 1.8.1 is ??
-# 1.8.2 is ??
-# 1.8.3 is ??
-# 2.8.0 is export
-
-# C.1(12880041.0(22:25 18-11-13)
-# 1.8.1(0000000597*Wh)
-# 1.8.2(0000000000*Wh)
-# 1.8.3(0000264238*Wh)
-# 1.8.0(0000264835*Wh)
-# 2.8.0(0000511354*Wh)
-
-# ==> /?!<0D><0A>
-# <== /ACE5SMLCD
-# ==> <06>050<0D><0A>
-# <==  -- STX -- 
-# <== C.1(12880041.0(22:48 18-11-13)
-# <== 1.8.1(0000000597*Wh)
-# <== 1.8.2(0000000000*Wh)
-# <== 1.8.3(0000264460*Wh)
-# <== 1.8.0(0000265057*Wh)
-# <== 2.8.0(0000511354*Wh)
-# <== !
-# <==  -- ETX -- 
-# <==  -- BCC --