Raymarine St290 Specifications Page 113

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Chapter 1: Preparing for Installation 6-1-15
ST290 Instrument System Owners Handbook
The total length of the SeaTALK
2
main cable run must be no more
than 655 ft (200 m). The main cable run is defined as the total length
of cable between the two terminators. For example, in Figure 1-10 ,
thelength of themain cable run is the sum of distances A+B+C+D+E.
Where it is impractical to connect a product in a daisy-chained man-
ner, a connector block and spur cable can be used. Where this method
is used, the length of the spur cable must not exceed 3 ft (1 m).
The sum of the LENs of all individual products in a SeaTALK
2
sys-
tem must not exceed 100. If this value exceeds 100 in the system you
are planning, contact the Raymarine Technical Support Department
or your local Raymarine Dealer for advice.
1.4 System structures
Preliminary information
Before running cables, refer to Table 1-4 , to determine which bus type
(SeaTalk or SeaTALK
2
) is required for each product you intend
installing. A summary of the various ST290 components and their
associated bus connections is shown in Table 1-4 .
Table 1-4: Bus allocations
Spend some time determining the best positions for the instruments and
transducers, such that the conditions described under Planning the
installation are satisfied. If you are planning to utilize the NMEA0183,
NMEA2000 or USB interfaces, for other products (e.g. GPS), you must
also take this into account when positioning your ST290 products.
In an ST290 system the Data Processing Unit (DPU) controls the
operationof thesystem, andconnects to theother systemcomponentsvia
SeaTalk and SeaTALK
2
buses. The Digital instruments and the
Component Bus connections
DPU
SeaTALK
2
and SeaTalk. NMEA 2000, NMEA 0183
and USB ports are also available.
Digital instruments (Graphic & Data)
SeaTALK
2
Transducer Pods (all types)
SeaTALK
2
Analog instruments (all types) SeaTalk
Keypads (all types) SeaTalk
81183_2 S6 chap 1.fm Page 15 Wednesday, May 7, 2003 2:20 PM
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