Davtron M877 Manuale di avvio rapido - Pagina 2

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M877 LSI Aircraft Time Management System

CLOCK OPERTION

Normal Operation

The SEL button selects what is to be displayed in the

four digit window and the CTL button controls what is

being displayed. Pressing select sequentially selects

GMT, Local Time, Flight Time, Elapsed Time and back

to GMT. The CTL button starts and resets Elapsed Time

when momentarily pushed. Normal operation of the

877 cannot accidentally reset time.

Setting GMT

Select GMT for display in the four digit window with the

SEL button. Simultaneously press both the select and

control buttons to enter the set mode. The tens of hours

digit will start flashing. The control button has full con-

trol of the flashing digit and each button push incre-

ments the digit. Once the tens of hour is set, the select

button selects the next digit to be set. After the last digit

has been selected and set with the control button, a

final push of the select button exits the mode. The light-

ed annunciator will resume its normal flashing, indict-

ing the GMT clock is running.

Setting LT

Select Local Time, LT, using the SEL button.

Simultaneously push the SEL and CTL buttons to enter

set mode. The tens of hours digit will start flashing. The

set operation is the same as for GMT, except that min-

utes are already synchronized with the GMT clock and

cannot be set in Local Time. The minutes are already

synchronized with GMT, but can be changed in 15 min-

ute increments for special time zones.

Control/Select Disable

When there is no aircraft power applied in the clock

CTL and SEL buttons are disabled.

Setting Flight Time Alarm

When Flight Time, FT, is displayed enter the set mode

by pressing both buttons simultaneously. The alarm

time is entered identically to GMT setting. When the

Flight Time equals the alarm the display will flash

and the alarm output activated. If FT was not being dis-

played at the time the alarm becomes active, the clock

automatically selects FT for display. Pressing either the

SEL or CTL button turns off the alarm and zeroes the

alarm time. Flight Time is unchanged and continues

counting.

Flight Time Reset

FT must be displayed when resetting. Hold CTL down

for 3 seconds, or until 99:59 Or 99:99 appears on the

display. The digits that appear depends on how the clock

is programmed. In hour and minutes, or in hours,

tenths and hundredths. Flight Time will be zeroed upon

release of the CTL button.

Elapsed Time Count Up

Select ET for display. Pressing the CTL button will start

ET counting. Elapsed Time counts up to 59 minutes, 59

seconds, and then switches to hours and minutes. It

continues counting up to 99 hours and 59 minutes.

Pressing the CTL button again resets ET to zero.

Elapsed Time Count Down

Select ET for display and enter set mode by pressing both

buttons. The countdown timer can now be set. Entering

the time is identical to GMT time setting. When the time

is entered and the last digit is no longer flashing the clock

is ready to start the countdown. Momentarily pressing the

CTL button starts the countdown. When count reach-

es zero the displays flash and the external alarm is acti-

vated. Pressing either SEL or CTL will deactivate the

alarm. ET continues counting up.

Test Mode

Hold the SEL button down for three seconds and the

display will indicate 88:88 and activate all four annun-

ciators.

FIELD OPTION CHANGES

When changes are made the connector of the clock

must be grounded to the soldering iron or warranty

may be void.

Serial Time Data: To change from GMT to LT, remove

case and jumper LT.

Local Time: To change from 12 hour to 24 hour format,

hold SEL in LT mode for 5 seconds till 12 HR or 24 HR

flashes, then push CTL for desired format. Push SEL to

exit set mode.

Flight Time: To change from recording in hours, min-

utes to recording in hours, tenths and hundredths,

remove case and jumper 99.

Battery Removal: The battery and battery holder may

be removed permanently if the aircraft battery is con-

nected to the Keep Alive input (Pin 9). No changes in

the clock are required.

Remote Time Display: Additional time displays can be

driven by the M877 clock. Only two wires carry the time

information to the remote display. The remote displays

have independent automatic dimming. Either GMT or

LT may be displayed. Remote display units are available

from Davtron, Inc.

Greenwich Mean Time

Flight Time

STANDARD AND

OPTIONAL FEATURES

12 or 24 hour format.

Local Time

Flight Time

in standard format of hours, minutes,

(99:59) or optional format of hours, tenths and hun-

dredths up to 99:99.

when FT

Flight Time Settable Alarm

reaches programmed alarm time the display flashes

and the external alarm output is activated.

counts in minutes

Elapsed Time Count Up

and seconds up to 59 minutes and 59 seconds and

then changes to hours and minutes up tp 99 hours and

59 minutes.

may be set to

Elapsed Time Count Down

count down anywhere from one second to 59 minutes

and 59 seconds.

Local Time

Elapsed Time

when the count down

Elapsed Time Alarm

time entered reaches zero the display flashes and the

external alarm output is activated. (Optional)

output standard is GMT. (Local Time

Serial Time

Optional)

is 28 Volts to 14 Volt.

Voltage

Input

Battery

is a longlife AA alkaline cell. The rec-

ommended change interval is two year. The clock

is available without battery from the factory. Keep

Alive (Pin 9) must then be connected to aircraft

battery. Remove AA battery if pin 9 is used.

Battery can be easily removed and replaced

Note

without removing clock from aircraft. Battery holder is

polarity marked with red end positive (+).