Patent ID: 8964774
Filing Date: 2015-02-24
Classification: H04L,H05B

Abstract:
1. A method of communicating a digital message in a control system having a first control device, a second control device, and a third control device coupled to a wired communication link, the method comprising the steps of: the first device establishing itself as a master device; the first device selecting a first Poll ID; the first device transmitting a Poll-ID-request poll message on the communication link; the second device and the third device both transmitting a break character in a predetermined time period following the first device transmitting the Poll-ID-request poll message if the second device and the third device do not have a Poll ID; the first device executing a search routine to determine that the second device transmitted the break character; the first device transmitting a second Poll ID on the communication link for receipt by the the second device determined to have sent the break character; and the first device transmitting the digital message to the second device using the second Poll ID.