diff --git a/src/RS232_win.c b/src/RS232_win.c
--- a/src/RS232_win.c
+++ b/src/RS232_win.c
@@ -95,10 +95,10 @@ int rs232setup(rs232port_t fd, int ChSiz
                 dcbSerialParams.Parity=Parity;
                 SetCommState(fd, &dcbSerialParams);
                 COMMTIMEOUTS timeouts={0};
-                timeouts.ReadIntervalTimeout=10;
-                timeouts.ReadTotalTimeoutConstant=10;
+                timeouts.ReadIntervalTimeout=100;
+                timeouts.ReadTotalTimeoutConstant=100;
                 timeouts.ReadTotalTimeoutMultiplier=1;
-                timeouts.WriteTotalTimeoutConstant=50;
+                timeouts.WriteTotalTimeoutConstant=100;
                 timeouts.WriteTotalTimeoutMultiplier=10;
                 SetCommTimeouts(fd, &timeouts);
 		return 0;