Hi all, I have plenty IR receiver/transmitter units connected to a serial bus. Units can be initiate in any moment to send message to another (addressed) unit by a serial bus. Does someone know how to arbitrate collisions in a serial bus easily? There isn't any master in a system. Every unit has a buffer to save whole message. I tried to find any protocol but haven't found any. Thanks Igor -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.