diff --git a/MkpWIFI/commands.py b/MkpWIFI/commands.py
index e1e4cc5..27e6368 100644
--- a/MkpWIFI/commands.py
+++ b/MkpWIFI/commands.py
@@ -44,7 +44,7 @@ MKPcommands = {
         'defPrefix': False,
         'begin': '\x02', #STX
         'end': '\x03',   #ETX 
-        'command': 'TZ{imagename};{printMode};{queueNo};{delay}\r{fieldContent}{counterStart}',
+        'command': 'TZ{imagename};{printMode};{queueNo};{delay}\r{fieldContent}\r{counterStart}',
         'success': '\x06\x02([0-9])OK\x03',
         'error': '([0-9])E([0-9])',
         'args': ['imageName', 'printMode', 'fieldContent'],
diff --git a/MkpWIFI/protocol.py b/MkpWIFI/protocol.py
index ad85272..471eb34 100644
--- a/MkpWIFI/protocol.py
+++ b/MkpWIFI/protocol.py
@@ -10,11 +10,20 @@ import commands as cmd
 import re
 
 
-def cmdString(cmdName, cmdArgs=None):
+def cmdString(cmdName, **cmdArgs):
     cmdDict = cmd.MKPcommands[cmdName]
+    mandatory_args = set(cmdDict['args'])
+    optional_args = set(cmdDict['optargs'])
+    my_args = set(cmdArgs.keys())
+    if my_args.intersection(mandatory_args) != my_args:
+        raise ValueError('Argomenti obbligatori errati o mancanti.')
+    if len(my_args-mandatory_args-optional_args) > 0:
+        raise Warning('Forniti argomenti sconosciuti!')
+    argDict = {**{a: cmdArgs[a] for a in mandatory_args}
+               ** {a: cmdArgs[a] if a in my_args else '' for a in optional_args}
+               }
     return str(cmd.DEFprefix['begin'] if cmdDict['defPrefix'] else cmdDict['begin']) \
-        + str(cmdDict['command']) \
-        + str(';'.join([cmdArgs[k] for k in cmdDict['args']]) if cmdArgs is not None else '') \
+        + re.sub(r';+', ';', cmdDict['command'].format(argDict)) \
         + str(cmd.DEFprefix['end']
               if cmdDict['defPrefix'] else cmdDict['end'])