Is there a mechanism to open a serial port for writing without impacting the control lines? open("/dev/ttyS0", O_WRONLY|O_NONBLOCK|O_NOCTTY) asserts RTS when there is no listener and I would like to avoid that. joe -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html