diff --git a/serial/t.c b/serial/t.c
index 4fed028..cd95b9e 100644
--- a/serial/t.c
+++ b/serial/t.c
@@ -3,17 +3,41 @@
 #include  <stdio.h>
 #include  <stdlib.h>
 #include  <time.h>
+#include  <unistd.h>			//Used for UART
+#include  <fcntl.h>			//Used for UART
+#include  <errno.h>
 
 #include  "serial.h"
 
 int	verbosity;
 
+/* ----------------------------------------------------- */
+int openserial(char *dev)
+{
+int	uart;
+
+fprintf(stderr, "%s ( %s )\n", __func__, dev);
+uart = open(dev, O_RDONLY | O_NOCTTY);
+if (uart < 0)
+	{
+	perror("unable to open uart");
+	return -1;
+	}
+return uart;
+}
+/* ----------------------------------------------------- */
+
 int main (int argc, char *argv[])
 {
-int		serial_in;
-int		byte;
+int		serial_in, foo;
+unsigned char	byte;
 
-serial_in = prepare_UART("/dev/ttyACM0", 9600);
+if (2 != argc) {
+	fprintf(stderr, "device name ?\n");
+	return 2;
+	}
+
+serial_in = openserial(argv[1]);
 fprintf(stderr, "prepare uart -> %d\n", serial_in);
 
 if (serial_in < 0) {
@@ -21,17 +45,16 @@ if (serial_in < 0) {
 	}
 
 for (;;) {
-
-	byte = getbyte(serial_in);
-
-	if (byte < 0) {
-		fprintf(stderr, "get byte : err is %d\n", byte);
+	foo = read(serial_in, &byte, 1);
+	if (1 != foo) {
+		fprintf(stderr, "get byte : err is %d\n", errno);
 		}
 	else	{
-		printf("%9ld  %02x/%d\n",
-			time(NULL), byte, byte);
+		printf("%9ld  %02x/%d\n", time(NULL), byte, byte);
 		}
 	}
 
 return 0;
 }
+
+/* ----------------------------------------------------- */
diff --git a/simulator/send-random/send-random.ino b/simulator/send-random/send-random.ino
index 16cd63f..70f8bb0 100644
--- a/simulator/send-random/send-random.ino
+++ b/simulator/send-random/send-random.ino
@@ -48,7 +48,7 @@ void sendvalues(void)
 void loop() {
   updatevalues();
   sendvalues();
-  delay(5000);
+  delay(1000);
 }
 
 /* -------------------------------------------------- */