Patent ID: 6401159
Filing Date: 2002-06-04
Classification: H04L

Abstract:
A method for half-duplex serial signal control with multiple baud rates and multiple configurations for a network that includes a power circuit, a protective circuit, an RS-232 interface circuit, an RS485 interface circuit and a logical control circuit; wherein said method controls activity in a receiving/transmitting signal control line (DIR) on the RS-485 interface circuit and comprises:starting transmission with a T1 sequence when the receiving/transmitting data control line is LOW; transmitting LOW signals, when the T1 sequence changes from HIGH to LOW, so that a sequence in the receiving/transmitting data control line (DIR) goes from LOW to HIGH; transmitting HIGH signals, when the T1 sequence changes from LOW to HIGH, so that the sequence in the receiving/transmitting data control line (DIR) goes from HIGH to LOW upon the expiration of a time delay t following every change of the T1 sequence from HIGH to LOW; and holding the receiving/transmitting signal control line (DIR) LOW while the network is receiving signals.