diff --git a/edl21.sh b/edl21.sh
index 23c8c8f..77bd1a2 100644
--- a/edl21.sh
+++ b/edl21.sh
@@ -1,50 +1,76 @@
 #!/bin/bash
-#Eingabegerät
+# edl21.sh reads data from the EDL21 electricity meter and writes it up to a MySQL/MariaDB.
+# https://code.hw12.org/tilman/edl21
+#
+# Version 0.5 - 03.03.2019
+#
+# License GPL3.0 or later
+# https://code.hw12.org/tilman/edl21/src/branch/master/LICENSE
+
+#Device configuration
 INPUT_DEV="/dev/ttyUSB0";
 stty -F $INPUT_DEV 1:0:8bd:0:3:1c:7f:15:4:5:1:0:11:13:1a:0:12:f:17:16:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0
 
-#Datum, Zeit und Datei.
-DATE=$(/bin/date +%Y%m%d-%H%M%S);
-PFAD=$(dirname "$(readlink -e "$0")");
+#Log file and temporary txt.
 FILE=$PFAD"/"$DATE."txt";
 LOG=$PFAD"/edl.log";
+PFAD=$(dirname "$(readlink -e "$0")");
 
-#Datenbank
-DB_USER="";
-DB_PASS="";
-DB_HOST="";
-DB_NAME="";
-DB_TAB="EdlData";
+#Database
+DB_USER="dbuser";
+DB_PASS="dbpasswd";
+DB_HOST="dbhost";
+DB_NAME="dbname";
+DB_TAB="dbtable";
 
-#Startsequenz
+#Get date and round to nearest 5min (for harmonized use with data from other scripts in pChart)
+DATE_RAW=$(/bin/date +%s);
+DATE=$(/bin/date -d @$DATE_RAW "+%Y-%m-%d %H:%M:%S");
+DATE_N5M=$(echo "($DATE_RAW % 300)"|bc);
+
+if [ $DATE_N5M -lt 150 ];then
+ DATE_N5M=$(echo "($DATE_RAW - ($DATE_RAW % 300))"|bc);
+else
+ DATE_N5M=$(echo "($DATE_RAW - ($DATE_RAW % 300) + 300)"|bc);
+fi
+DATE_N5M=$(/bin/date -d @$DATE_N5M "+%Y-%m-%d %H:%M:%S");
+
+#Starting sequence
 SEQ_START="1B1B1B1B01010101";
-#Endsequenz
+#Ending sequence
 SEQ_END="001B1B1B1B1A00";
-#Beginn Zähler 1.8.0 (Wirkarbeit Bezug)
+#Start of counter 1.8.0 (incoming active energy)
 SEQ_180="070100010800FF";
-#Beginn Zähler 2.8.0 (Wirkarbeit Lieferung)
+#Start of counter 2.8.0 (outgoing acive energy)
 SEQ_280="070100020800FF";
-#Beginn aktuelle Wirkleistung
+#Start of actual aktive power
 SEQ_PWR="070100100700FF";
-
+#Max possiple power value as mark of power direction
 INOUT=2147483647;
 
+#Read from device
 cat $INPUT_DEV 2>/dev/null | xxd -p -u -l 600 1> $FILE;
 
+#Delete line breaks
 STRING=`tr -d "\n" <  $FILE`;
+#Find first starting sequence forwards and delete everything before
 STRING=${STRING#*$SEQ_START};
+#Find last ending sequence backwards and delete everything behind
 STRING=${STRING%%$SEQ_END*};
 
+#Identify incoming active energy value and transform from hex to decimal
 STRING_180=${STRING#*$SEQ_180};
 let STRING_180=0x${STRING_180:20:10};
 
+#Identify outgoing active energy value and transform from hex to decimal
 STRING_280=${STRING#*$SEQ_280};
 let STRING_280=0x${STRING_280:20:10};
 
+#Identify active power value and transform from hex to decimal.
 STRING_PWR=${STRING#*$SEQ_PWR};
 let STRING_PWR=0x${STRING_PWR:14:8};
 
-#Richtung der Leistung abfangen und in W umrechnen..
+#Calculate direction of active power and convert in W (Watt)
 if [ $STRING_PWR -gt $INOUT ]; then
  STRING_PWR_OUT=$(echo "(4294967295 - $STRING_PWR) / (10)"|bc);
  STRING_PWR_IN=0;
@@ -52,17 +78,18 @@ else
  STRING_PWR_IN=$(echo "$STRING_PWR / 10"|bc);
  STRING_PWR_OUT=0;
 fi
-#Zählerstände in Wh!
+
+#Convert both active energy values in Wh (Watt hours)
 STRING_180=$(echo "scale=4; $STRING_180 / 10" |bc);
 STRING_280=$(echo "scale=4; $STRING_280 / 10" |bc);
 
-#LOG
-echo $DATE";"$STRING_180";"$STRING_280";"$STRING_PWR_IN";"$STRING_PWR_OUT >> $LOG ;
+#Write to log file
+echo $DATE";"$DATE_N5M";"$STRING_180";"$STRING_280";"$STRING_PWR_IN";"$STRING_PWR_OUT >> $LOG ;
 
-#DATENBANK
+#Send data to database
 mysql -u $DB_USER -p$DB_PASS -h $DB_HOST -D $DB_NAME <<EOF
-INSERT INTO $DB_TAB (TimeStamp,zaehlerstand_in,zaehlerstand_out,active_in,active_out) VALUES (CURRENT_TIMESTAMP,'$STRING_180','$STRING_280','$STRING_PWR_IN','$STRING_PWR_OUT')
+INSERT INTO $DB_TAB (TimeStamp,Nearest5min,zaehlerstand_in,zaehlerstand_out,active_in,active_out) VALUES ('$DATE','$DATE_N5M','$STRING_180','$STRING_280','$STRING_PWR_IN','$STRING_PWR_OUT');
 EOF
 
-#AUFRAEUMEN
+#Delete temporary file
 rm $FILE;
\ No newline at end of file