Faria Instruments 2141 Faria Serial Bus Description Operation, Speedometer / Depth Sounder

Faria Serial Bus Description Operation

General

The Faria Serial Bus system is designed to receive information from the engine EMM and various individual sensors throughout the boat. This information is transformed into digital data which is distributed to analog and digital instruments via a single cable consisting of two shielded twisted pairs of conductors. Each instrument selects the data which is applicable and displays it as if it was being received from the sender directly. One of the two pairs of conductors carries the data while the other pair of conductors carry the power for the instruments.

The four-inch serial bus instruments have three push buttons which allow the different functions of each instrument to be activated. Following is a description of these functions.

Speedometer / Depth Sounder

The Serial Bus Speedometer / Depth Sounder provides the functions of a speedometer, a depth sounder and a speedometer calibration feature. The analog speedometer is a stepper motor instrument which looks like a standard analog device but which is actually a digital instrument. On small pointer movements you may occasionally see the pointer moving in the one-third degree “steps” that represent the accuracy of the instrument.

To turn the depth sounder on, the ignition key must be in the ‘run’ position. Press the “mode-M” button to turn on the depth sounder.

M Mode Button

Turning off the ignition key will turn off the depth sounder.

The LCD screen displays the data for the remainder of the functions. If there are no alarm conditions, the water depth is displayed on start-up.

Depth Sounder

In normal operation the LCD will show the current depth. If there is no transducer connected or the signal is weak then the display will alternate between the last known depth and three vertical bars.

Pressing the “mode-M” key quickly while

M Mode

Button

in depth sounder normal operation displays the speedometer calibration mode. This is described in a later section.

Depth Sounder Settings

To change the depth sounder alarm settings, the “mode-M” button must be held down until the display changes to the

M Mode

Button

alarm mode. There are four menus in the alarm mode. Quickly press the “mode-M” switch to cycle through the different options.

Shallow alarm - Alarm sounds when water depth equals or is less than set value.

The display will show “S X.X ” which is the current setting for the shallow alarm. Pressing the “Up” or ”Down” buttons will change the shallow setting.

Down	Up
Button	Button

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