> Perhaps the RTS toggle after transmit delay needs to be large, and > they'd rather do it in userspace than block in the driver. I also > recall a protocol that would send a master assertion command and hold > on to RTS afterwards. I can easily imagine needing to quickly Appletalk does this for one. Some protocols use it for priming low cpu power receivers. You fire a header message at the target which fits into its serial fifo, it then responds and can sit in a tight loop getting the following frame data. Alan -- 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