diff --git a/src/RS232_win.c b/src/RS232_win.c
--- a/src/RS232_win.c
+++ b/src/RS232_win.c
@@ -92,8 +92,29 @@ rs232speed_t rs232cfspeed(unsigned int B
 				    
 	if(BaudeRate<172800)
 		return (rs232speed_t)CBR_115200;
+	
+	if(BaudeRate<345600)
+		return (rs232speed_t)230400;
+
+	if(BaudeRate<345600)
+		return (rs232speed_t)460800;
+	
+	if(BaudeRate<748800)
+		return (rs232speed_t)576000;  
+
+	if(BaudeRate<1210800)
+		return (rs232speed_t)921600;
+	
+	if(BaudeRate<1750000)
+		return (rs232speed_t)1500000;
+
+	if(BaudeRate<2250000)
+		return (rs232speed_t)2000000;
+
+	if(BaudeRate<2750000)
+		return (rs232speed_t)2500000;
 	else
-		return (rs232speed_t)CBR_256000;
+		return (rs232speed_t)3000000;
 }