500 SERIES INSTALLATION MANUAL Page C-1190-00181-02 Rev QAppendix C. 500 SERIES RS-232 AVIATION DATA FORMATC.1 ELECTRICAL INTERFACEThe output signals shall be compatible with RS-232C. Data shall be generated at 9600 baud with a wordlength of 8 bits, one stop bit, and no parity.C.2 GENERAL OUTPUT FORMATThe 500 Series RS-232 data shall have the following general format:STX - ASCII start-of-text character (02 hex)t1s - Type 1 output sentences (see following paragraphs for description)t2s - One or more type 2 output sentences (see following paragraphs for description)ETX - ASCII end-of-text character (03 hex)C.3 OUTPUT SENTENCE TYPE 1The Type 1 output sentences shall have the following general format:id - item designator (single ASCII alphabetic character)dddd - item data (1 to 10 printable ASCII characters)CR - ASCII carriage return character (0D hex)LF - ASCII line feed character (0A hex)*Each Type 1 sentence shall be output by the 500 Series unit approximately once every second.The track, desired track, and bearing to waypoint angles, and the magnetic variation are output accordingto the current mode of the 500 Series unit (automatic magnetic heading, magnetic variation computed atlast known position; true heading, magnetic variation of E00.0°; or user-defined magnetic heading,magnetic variation as entered by user).
