diff --git a/src/RS232_unix.c b/src/RS232_unix.c
--- a/src/RS232_unix.c
+++ b/src/RS232_unix.c
@@ -25,14 +25,14 @@ rs232speed_t rs232cfspeed(unsigned int B
 
 rs232port_t rs232open(char* psPortName)
 {
-        rs232port_t fd;
-	fd = (rs232port_t)open(psPortName, O_RDWR | O_NOCTTY | O_NDELAY);
-	fcntl((int)fd, F_SETFL, 0);
-	//fd = open(psPortName, O_RDWR | O_NOCTTY);
-	#ifdef debug
-		if(fd==-1)printf("can't open Port\n");
-	#endif
-	return fd;
+   rs232port_t fd;
+   fd = (rs232port_t)open(psPortName, O_RDWR | O_NOCTTY | O_NDELAY);
+   fcntl((int)fd, F_SETFL, FNDELAY);
+   //fd = open(psPortName, O_RDWR | O_NOCTTY);
+   #ifdef debug
+      if(fd==-1)printf("can't open Port\n");
+   #endif
+   return fd;
 }
 
 int rs232close(rs232port_t fd)
@@ -125,6 +125,10 @@ int rs232setup(rs232port_t fd, int ChSiz
 	{
 		struct termios terminos;
 		tcgetattr(fd, &terminos);
+        	terminos.c_iflag=0;
+	        terminos.c_oflag=0;
+		terminos.c_cflag=0;
+		terminos.c_lflag=0;
 		cfsetispeed(&terminos, rs232cfspeed(BaudeRate));
 		cfsetospeed(&terminos, rs232cfspeed(BaudeRate));
 		terminos.c_cflag |= (CLOCAL | CREAD);
@@ -483,13 +487,16 @@ int rs232saferead(rs232port_t fd,char* d
 {
 	int read=0;
 	int i=0;
-	for(i=0;i<100;i++)
+	for(i=0;i<1000;i++)
 	{
 		read = rs232read((int)fd,data,count);
-		count -=read;
+		//printf("read %d bytes\n",read);
+		if(read==-1)read=0;
+		count-=read;
 		data+=read;
 		if(count==0)
 			return 0;
+		usleep(10);
 	}
 	return -1;
 }
@@ -503,6 +510,8 @@ int rs232safewrite(rs232port_t fd,char* 
 	for(i=0;i<1000;i++)
 	{
 		written = rs232write((int)fd,data+written,count);
+		//printf("%d bytes written\n",written);
+		if(written==-1)written=0;
 		count-=written;
 		data+=written;
 		if(count==0)