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M850B

L S I A i r c r a f t T i m e M a n a g e m e n t S y s t e m

CLOCK OPERATION

Normal Operation

The select, SEL, button selects what is to be displayed

in the four digit window and the Control, CTL, button

controls what is being displayed. Pressing SEL

sequentially selects GMT, Local Time, Flight Time,

Elapsed Time, Count Down Time, and back to GMT. The

CTL button starts, stops and resets Elapsed Time when

momentarily pushed. Normal operation of the 850B

cannot accidentally reset time.

Setting GMT

Select GMT for display in the four digit window with the

SEL button. Simultaneously press both the SEL and CTL

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

will start ﬂashing. The CTL button has full control of the

ﬂashing digit and each button push increments the digit.

Once the tens of hour is set, the SEL button selects the

next digit to be set. After the last digit has been selected

and set with the CTL button, a ﬁnal push of the SEL

button exits the mode. The lighted annunciator will

resume its normal ﬂashing, indicating the GMT clock is

running.

Setting LT

Select Local Time, LT, using the SEL button. Simultane-

ously 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 minutes

are already synchronized with the GMT clock. Minutes

can be changed in 15 minute increments for special

time zones.

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 is activated. If FT was not being displayed 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. 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 appear on the

display; Flight Time will be zeroed upon the release of

the CTL button. The digits that appear (99:59 or 99:99)

depend on how the clock is programmed - in hours and

minutes or in hours, tenths, and hundredths.

Download installation manual www.davtron.com product page M850B

Elapsed Time

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 stops ET, another press

resets ET. ET has a countdown timer function, repeat

steps for CDT in ET mode.

Count Down Time

Select CDT for display and enter set mode by pressing

both buttons. The Count Down 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 reaches zero the displays ﬂash

and the external alarm is activated. Pressing either SEL

or CTL will deactivate the alarm. CDT continues

counting up. Next press on CTL button to stop counting.

Second press resets CDT to previous set time.

Test Mode

In GMT mode, Hold the SEL button down for three

seconds and the display will indicate 88:88 and activate

all ﬁve annunciators.

FIELD OPTION CHANGES

When changes are made the connector of the clock

must be grounded to the soldering iron or warranty may

void.

Local Time:

To change from12 hour to 24 hour

format, hold SEL in LT mode for 5 seconds until12 HR

(hour) or 24 HR (hour) ﬂashes, then push CTL for

desired format. Push SEL to exit set mode.

Flight Time:

To change from recording in hours,

minutes to recording in hours, tenths, and hundredths,

remove case and jumper OPT-99.

Battery:

is a CR2032 coin cell. The recommended

change interval is 5 years. The battery may be removed

permanently if the aircraft battery is connected to the

Keep Alive input (Pin 9). ***Recommend to remove

CR2032 battery if pin 9 is used.

Backlighting SET-UP:

Press and hold

down the SEL button on power up to verify backlighting

conﬁguration. Pressing CTL will provide sequence

options 5(Volt), 14(Volt), 28(Volt), and A (Automatic

Sensing). Select backlighting voltage and press SEL

button to conﬁrm. A (Automatic Sensing) will provide

automatic backlighting for input voltage 14 and 28 Volt.

Greenwich Mean Time

Flight Time

Count Down Time

Local Time

Elasped Time