APPARATUS AND METHOD FOR IDENTIFICATION OF MESSAGE INITIATION IN A PROCESS CONTROL NETWORK

摘要

In order to insure the accuracy of information transmitted over a network, the initiation of the message must be unambiguously identified. In the present invention, the intermessage spacing consists of a series of identical logic signals that exceeds a minimum value distinguishing this interval from a message character. The message character has predefined length, with a start bit position and a stop bit position logic signal bounding the character that have the same predetermined logic signals for every message character. The character has at least one additional non-data bit position that has a first logic signal for the initial character of a message and the complementary logic signal for the remaining characters in the message.