Raymarine SeaTalk-SeaTalk ng Specifications download pdf (Page 17)

Chapter 2: Installation 11

Figure 2-1 Where to connect SeaTalk

power in a balanced system

Small systems

Although the preferred method of connection is to form a balanced system as above,

in systems where the backbone length is 60 m or less, you may connect power at one

end of the system, to form an unbalanced system.

Permitted power loading

The total load permissible in a SeaTalk

system is defined in terms of the total LEN of

all products connected to the system, and depends on the length of the backbone.

Balanced system loading

The maximum loading (total LEN) for balanced SeaTalk

systems of various lengths

is given in the following table. Note that in each case, the total LEN must be

divided equally each side of the power connection point.

Unbalanced system loading

The maximum LEN for unbalanced SeaTalk

systems up to 197 ft (60 m) is given in

the following table.

Backbone length Total LEN Backbone length Total LEN

197 ft (60 m) or less 100 394 ft (120 m) 50

262 ft (80 m) 84 459 to 525 ft (140 to 160 m) 40

328 ft (100 m) 60 591 to 656 ft (180 to 200 m) 32

Backbone length Total LEN

66 ft (20 m) 40

131 ft (40 m 20

197 ft (60 m) 14

Product A

LEN = 4

Product B

LEN = 6

Product C

LEN = 6

Product F

LEN = 6

Product E

LEN = 5

Product D

LEN = 4

Product G

LEN = 5

Prod. H

LEN = 2

Prod. J

Terminator

Total system LEN = 40

Optimum power connection point = 40

= 20 LEN from end of Backbone

D10347-1

Backbone

81300_1.book Page 11 Tuesday, May 22, 2007 2:53 PM

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Raymarine SeaTalk-SeaTalk ng Specifications Page 17

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