diff --git a/ChangeLog b/ChangeLog
index e3db988d..06794316 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,9 @@
 ebus Daemon (ebusd) - ChangeLog
 ===============================
 
+2013-11-29:
+* New daemon option nodevicecheck added.
+
 2013-11-19:
 * Data type of struct commands.s_type changed from integer to char[2]. Possible
   data types are: BR, MM, MS. (BroadCast, MasterMaster, MasterSlave)
diff --git a/contrib/etc/ebusd/ebusd.conf b/contrib/etc/ebusd/ebusd.conf
index 0b0f5145..59b12c17 100644
--- a/contrib/etc/ebusd/ebusd.conf
+++ b/contrib/etc/ebusd/ebusd.conf
@@ -21,6 +21,9 @@
 # log file (/var/log/ebusd.log)
 #logfile=/var/log/ebusd.log
 
+# don't check serial device (NO | YES/NO)
+#nodevicecheck=YES
+
 # pid file (/var/run/ebusd.pid)      
 #pidfile=/var/run/ebusd.pid
 
diff --git a/lib/ebus-bus.c b/lib/ebus-bus.c
index f194faa0..3a783b3c 100644
--- a/lib/ebus-bus.c
+++ b/lib/ebus-bus.c
@@ -52,6 +52,7 @@ static struct send_data send_data;
 
 static struct recv_data recv_data;
 
+static int nodevicecheck = NO;
 static int rawdump = NO;
 static int showraw = NO;
 
@@ -74,6 +75,14 @@ static FILE *rawfp = NULL;
 
 
 
+
+
+void
+eb_set_nodevicecheck(int check)
+{
+	nodevicecheck = check;	
+}
+
 void
 eb_set_rawdump(int dump)
 {
@@ -185,7 +194,7 @@ eb_serial_valid()
 {
 	int serial;
 
-	if (ioctl(sfd, TIOCMGET, &serial) < 0) 
+	if (ioctl(sfd, TIOCMGET, &serial) < 0 && nodevicecheck == NO) 
 		return -1;
 	else
 		return 0;	
diff --git a/lib/ebus-bus.h b/lib/ebus-bus.h
index feb9c982..b1bfa7a9 100644
--- a/lib/ebus-bus.h
+++ b/lib/ebus-bus.h
@@ -64,6 +64,15 @@ struct recv_data {
 
 
 
+
+
+/**
+ * @brief set nodevicecheck
+ * @param [in] YES | NO
+ * @return none
+ */
+void eb_set_nodevicecheck(int check);
+
 /**
  * @brief set rawdump
  * @param [in] YES | NO
diff --git a/src/ebusd.c b/src/ebusd.c
index f6c85388..03ef1ff0 100644
--- a/src/ebusd.c
+++ b/src/ebusd.c
@@ -60,6 +60,7 @@ static char extension[10];
 static int foreground = UNSET;
 static char loglevel[CFG_LINELEN];
 static char logfile[CFG_LINELEN];
+static int nodevicecheck = UNSET;
 static char pidfile[CFG_LINELEN];
 static int port = UNSET;
 static int rawdump = UNSET;
@@ -78,50 +79,52 @@ static int print_size = UNSET;
 static char options[] = "a:c:C:d:e:fl:L:P:p:rR:sStvh";
 
 static struct option opts[] = {
-	{"address",    required_argument, NULL, 'a'},
-	{"cfgfdir",    required_argument, NULL, 'c'},
-	{"cfgfile",    required_argument, NULL, 'C'},
-	{"device",     required_argument, NULL, 'd'},
-	{"extension",  required_argument, NULL, 'e'},
-	{"foreground", no_argument,       NULL, 'f'},
-	{"loglevel",   required_argument, NULL, 'l'},
-	{"logfile",    required_argument, NULL, 'L'},
-	{"pidfile",    required_argument, NULL, 'P'},
-	{"port",       required_argument, NULL, 'p'},
-	{"rawdump",    no_argument,       NULL, 'r'},
-	{"rawfile",    required_argument, NULL, 'R'},
-	{"showraw",    no_argument,       NULL, 's'},	
-	{"settings",   no_argument,       NULL, 'S'},
-	{"localhost",  no_argument,       NULL, 't'},
-	{"version",    no_argument,       NULL, 'v'},
-	{"help",       no_argument,       NULL, 'h'},
-	{NULL,         no_argument,       NULL,  0 },
+	{"address",       required_argument, NULL, 'a'},
+	{"cfgfdir",       required_argument, NULL, 'c'},
+	{"cfgfile",       required_argument, NULL, 'C'},
+	{"device",        required_argument, NULL, 'd'},
+	{"extension",     required_argument, NULL, 'e'},
+	{"foreground",    no_argument,       NULL, 'f'},
+	{"loglevel",      required_argument, NULL, 'l'},
+	{"logfile",       required_argument, NULL, 'L'},
+	{"nodevicecheck", no_argument,       NULL, 'n'},
+	{"pidfile",       required_argument, NULL, 'P'},
+	{"port",          required_argument, NULL, 'p'},
+	{"rawdump",       no_argument,       NULL, 'r'},
+	{"rawfile",       required_argument, NULL, 'R'},
+	{"showraw",       no_argument,       NULL, 's'},	
+	{"settings",      no_argument,       NULL, 'S'},
+	{"localhost",     no_argument,       NULL, 't'},
+	{"version",       no_argument,       NULL, 'v'},
+	{"help",          no_argument,       NULL, 'h'},
+	{NULL,            no_argument,       NULL,  0 },
 };
 
 static struct config cfg[] = {
 
-{"address",    STR, &address, "\tbus address (" NUMSTR(EBUS_QQ) ")"},
-{"cfgdir",     STR, &cfgdir, "\tconfiguration directory of command files (" DAEMON_CFGDIR ")"},
-{"cfgfile",    STR, &cfgfile, "\tdaemon configuration file (" DAEMON_CFGFILE ")"},
-{"device",     STR, &device, "\tserial device (" SERIAL_DEVICE ")"},
-{"extension",  STR, &extension, "extension of command files (" DAEMON_EXTENSION ")"},
-{"foreground", BOL, &foreground, "run in foreground"},
-{"loglevel",   STR, &loglevel, "\tlog level (INF | " LOGTXT ")"},
-{"logfile",    STR, &logfile, "\tlog file (" DAEMON_LOGFILE ")"},
-{"pidfile",    STR, &pidfile, "\tpid file (" DAEMON_PIDFILE ")"},
-{"port",       NUM, &port, "\tport (" NUMSTR(SOCKET_PORT) ")"},
-{"rawdump",    BOL, &rawdump, "\tdump raw ebus data to file"},
-{"rawfile",    STR, &rawfile, "\traw file (" DAEMON_RAWFILE ")"},
-{"showraw",    BOL, &showraw, "\tprint raw data"},
-{"settings",   BOL, &settings, "\tprint daemon settings"},
-{"localhost",  BOL, &localhost, "allow only connection from localhost"},
-{"get_retry",  NUM, &get_retry, NULL},
-{"skip_ack",   NUM, &skip_ack, NULL},
-{"max_wait",   NUM, &max_wait, NULL},
-{"send_retry", NUM, &send_retry, NULL},
-{"print_size", NUM, &print_size, NULL},
-{"version",    STR, NULL, "\tprint version information"},
-{"help",       STR, NULL, "\tprint this message"}
+{"address",       STR, &address, "\tbus address (" NUMSTR(EBUS_QQ) ")"},
+{"cfgdir",        STR, &cfgdir, "\tconfiguration directory of command files (" DAEMON_CFGDIR ")"},
+{"cfgfile",       STR, &cfgfile, "\tdaemon configuration file (" DAEMON_CFGFILE ")"},
+{"device",        STR, &device, "\tserial device (" SERIAL_DEVICE ")"},
+{"extension",     STR, &extension, "extension of command files (" DAEMON_EXTENSION ")"},
+{"foreground",    BOL, &foreground, "run in foreground"},
+{"loglevel",      STR, &loglevel, "\tlog level (INF | " LOGTXT ")"},
+{"logfile",       STR, &logfile, "\tlog file (" DAEMON_LOGFILE ")"},
+{"nodevicecheck", BOL, &nodevicecheck, "don't check serial device"},
+{"pidfile",       STR, &pidfile, "\tpid file (" DAEMON_PIDFILE ")"},
+{"port",          NUM, &port, "\tport (" NUMSTR(SOCKET_PORT) ")"},
+{"rawdump",       BOL, &rawdump, "\tdump raw ebus data to file"},
+{"rawfile",       STR, &rawfile, "\traw file (" DAEMON_RAWFILE ")"},
+{"showraw",       BOL, &showraw, "\tprint raw data"},
+{"settings",      BOL, &settings, "\tprint daemon settings"},
+{"localhost",     BOL, &localhost, "allow only connection from localhost"},
+{"get_retry",     NUM, &get_retry, NULL},
+{"skip_ack",      NUM, &skip_ack, NULL},
+{"max_wait",      NUM, &max_wait, NULL},
+{"send_retry",    NUM, &send_retry, NULL},
+{"print_size",    NUM, &print_size, NULL},
+{"version",       STR, NULL, "\tprint version information"},
+{"help",          STR, NULL, "\tprint this message"}
 };
 
 const int cfglen = sizeof(cfg) / sizeof(cfg[0]);
@@ -189,6 +192,9 @@ cmdline(int *argc, char ***argv)
 		case 'L':
 			strncpy(logfile, optarg, strlen(optarg));
 			break;
+		case 'n':
+			nodevicecheck = YES;
+			break;
 		case 'P':
 			strncpy(pidfile, optarg, strlen(optarg));
 			break;
@@ -250,6 +256,9 @@ set_unset(void)
 	if (*logfile == '\0')
 		strncpy(logfile , DAEMON_LOGFILE, strlen(DAEMON_LOGFILE));
 
+	if (nodevicecheck == UNSET)
+		nodevicecheck = NO;
+
 	if (*pidfile == '\0')
 		strncpy(pidfile , DAEMON_PIDFILE, strlen(DAEMON_PIDFILE));
 
@@ -669,6 +678,7 @@ main(int argc, char *argv[])
 
 	
 	/* set ebus configuration */
+	eb_set_nodevicecheck(nodevicecheck);
 	eb_set_rawdump(rawdump);
 	eb_set_showraw(showraw);
 
diff --git a/src/ebusd.h b/src/ebusd.h
index 04a844b4..5dc67eb6 100644
--- a/src/ebusd.h
+++ b/src/ebusd.h
@@ -28,13 +28,10 @@
 #define DAEMON_CFGDIR         "/etc/ebusd"
 #define DAEMON_CFGFILE        DAEMON_CFGDIR"/ebusd.conf"
 #define DAEMON_EXTENSION      "csv"
-#define DAEMON_FOREGROUND     NO
 #define DAEMON_LOGLEVEL       "INF"
 #define DAEMON_LOGFILE        "/var/log/ebusd.log"
-#define DAEMON_NOSYN          NO
 #define DAEMON_PIDFILE        "/var/run/ebusd.pid"
 #define DAEMON_RAWFILE        "/tmp/ebusd.bin"
-#define DAEMON_RAWDUMP        NO
 
 
 void usage(void);