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Wiring Information for CAN Type Gauges

REQUIREMENTS

SmartCraft communications are via the Controller Area Network (CAN), electrically imple-

mented on a twisted pair of wires. signals. Note: SmartCraft harnesses include other signals

besides CAN.

The maximum distance between any two modules on the SmartCraft bus is 40 meters (130

feet). This distance is calculated as the total harness length between the modules (trunk

length plus drop lengths).

There must be exactly two termination resistors on the CAN bus.

No more than 20 modules may be connected to the bus. This is the maximum number of

connections supported by the engine control module software.

INSTALLATION GUIDELINES

SmartCraft installations should use Mercury Marine harnesses and junction boxes. This as-

sures a robust mechanical implementation as well as proper connection of all signals.

The ideal installation uses a single trunk line with short drops to individual modules. Two

termination resistors, one at each end of the trunk line, minimize signal reflections. Signal

reflections can increase radio frequency interference and the potential for bit errors on the

bus.

The trunk line is not defined by junction boxes. The trunk should be considered to be the

distance between the termination resistors. Drops may be at the ends of the trunk line or

anywhere else that is convenient for the installation. Note that the trunk line can “loop-back”

in some installations.

• The single engine System Monitor example on page 32 illustrates a trunk line with two

drops of essentially zero length, one at the engine and the other at the gauge.

• The single engine System Tach and Speedo example on page 32 illustrates a trunk line

with one zero length drop at the engine and two three foot drops at the gauges.

• The dual engine examples on page 33 illustrates a 60 foot trunk line with two zero length

drops at the engines and two (or three) three foot drops at the gauges.

• The triple engine example on page 34 illustrates a 45 foot trunk line with a zero length

drop at one engine, two 10 foot drops (at the other engines), and four three foot drops

at the gauges.

• The trunk line in the single engine dual station example on page 35 is the length of “a”

plus the length of “f” There is a zero length drop at the engine and two three foot drops

to the monitors.

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Mercury 200 Optimax Installationshandbuch Seite 30