Eaton Cutler-Hammer Durant PRESIDENT Series Installation And Operation Manual

Contents

SERIAL COMMUNICATIONS37Figure 29. Organization of Typical Serially Transmitted CharacterFigure 30. Serial Transmission of a Complete Value, Including “CNT” Label, Value, “CR” and “LF”After the entire value has been transmitted, thecontrol sends two more characters. These arecalled “Carriage Return” (CR) and “Line Feed”(LF). A printer, host computer or other peripheraluses these characters to identify when a transmis-sion is complete. In the case of the printer, the“CR” instructs it to return the printing carriage andthe “LF” tells it to advance the paper one line. The“CR” and “LF” are transmitted after each valuethe control sends.By selecting the associated value for the Commu-nications Type function (Function 91) the controlcan transmit the counter value or any combination