Section 1: An Introduction to ST290 1-1-3ST290 Instrument System Owner’s HandbookThe system components communicate with one another over RaymarineSeaTalk and SeaTALK2 buses.Both digital and analog instrument types are available.System busesThe ST290 products are connected via Raymarine SeaTalk andSeaTALK2 buses to form a single, integrated system. On each bus, theST290 products are linked by means of a single cable, which feeds bothpower and data. Details of bus/product compatibility are given inSection 6, Installation.SeaTalk and SeaTALK2 communicate with one another via the DataProcessing Unit.Digital instrumentsST290 digital instruments can display a wide range of system data, onboth Graphic and Data Displays:• Graphic Displays use dot-matrix screens.• Data Displays use preformed, segmented characters.Information on both digital instrument types is organized in ‘chapters’and ‘pages’ to enable you to easily find the data you want.Graphic Displays provide the most versatile way of presenting data, asthey can show dynamic graphs and other animated information, inaddition to the alphanumeric information available on both digitalinstrument types. They are also used to calibrate the system transducers.For a description of the functions and operation of the ST290 digitalinstruments, refer to Section 2, Using Digital Instruments.Analog instrumentsAnalog instruments are available to show:• Wind• Close Hauled Wind• Compass• Rudder angleFor a description of the functions and operation of the ST290 analoginstruments, refer to Section 3, Using Analog Instruments.