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Workshop manual RR 4T - 400 - 450 - 525
AUTOMATIC TRIP FUNCTION (TD)
T≥ 3” resets LAP and TD
T<3” cycles through functions
This function is always accompanied by the TD caption. The in-
formation displayed represents the total distance covered by the
vehicle in kilometres or miles (according to the selected unit). It
is an automatic counter which is activated by the first pulse gen-
erated by the speed sensor.
The counter for this parameter can be reset while in TD mode
by pressing the button for about 3 seconds until 000.0 is dis-
played. The TD function can be reset while the vehicle is sta-
tionary or in motion and also causes the reset of the LAP para-
meter.
COUNTDOWN TRIP FUNCTION (COUNTDOWN)
T≥ 3” and Vel=0 enables setting of countdown
T<3” or Vel>0 cycles through functions
This function is always accompanied by a flashing TD caption.
The counter is always active and is automatically decreased by
0.1 kilometres or miles according to the selected unit. The value
for this parameter can be changed in TD decrease mode by
pressing the button for about 3 seconds while the vehicle is sta-
tionary.
The different figures that make up the counter can be altered
starting from the most significant figure and shifting in succes-
sive steps to the least significant figure.
Pressing the button for a short time decreases the value by one
step; pressing it for a longer time allows a different parameter to
be selected. After setting the least significant figure, press the
button for about three seconds to go back to the standard oper-
ating mode. If the parameter reaches 000.0, the system auto-
matically sets it to 999.9.
While in the setting menu, if no buttons are pressed for 20 sec-
onds the system will automatically return to the standard oper-
ating mode.
Moving off (Vel > 0) while the setting mode is activated causes
the system to automatically return to the standard operating
mode
SLEEP-MODE
One minute after the last pulse from the speed sensor has been
received, or after the button was last depressed, the microcon-
troller switches to a power-saving status named Sleep Mode. In
order to save power, all standard instrument activity is suspend-
ed, the display and the backlighting are turned off (if the vehicle
has no battery the backlighting is automatically turned off as
soon as the engine is switched off) and only the clock remains
in operation. The system can go into Sleep Mode regardless of
the selected function.
WAKE UP (from Sleep Mode)
The system wakes up from Sleep Mode whenever:
•The instrument receives a signal from the speed sensor.
•The button is depressed.
As soon as the microcontroller wakes up the following happens:
• The display and the warning lights are checked (all the warn-
ing lights come up providing that power is supplied by the ve-
hicle) for about 2 seconds.
• The selected wheel circumference and number of wheel puls-
es are displayed for about 2 seconds.
• The last function in use when the system went into Sleep Mode
is activated. If the waking up takes place through the electron-
ic transmission (i.e. without pressing the button), the instru-
ments immediately switch to the standard operating mode
without checking the display and the warning lights and with-
out showing the selected wheel circumference and number of
wheel pulses.
A
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