Sismo 737NG User manual

737NG CLOCK/CHRONO
User Manual
FS737NG-MAN-GAU-CT-E-18-0172
Rev. 2.2
©2005-2018, Sismo Soluciones All rights reserved

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LOG
Rev.
Date
Description
01
September 2011
First Edition
02
July 2017
Template and small modifications
INDEX
1Definitions and acronyms..........................................................................................................................3
1.1 Definitions.........................................................................................................................................3
1.2 Acronyms ..........................................................................................................................................3
2Preliminary notes.......................................................................................................................................3
3Introduction...............................................................................................................................................3
4Installation.................................................................................................................................................4
5Maintenace................................................................................................................................................5
6Functionality..............................................................................................................................................5
6.1 TIME/DATE Function.........................................................................................................................6
7TIME/DATA Configuration .........................................................................................................................7
7.1 Elapsed Time...................................................................................................................................10
7.2 Chronograph Function....................................................................................................................11
8Measurements.........................................................................................................................................12
9Available Products ...................................................................................................................................13
9.1 Pictures ...........................................................................................................................................13
10 FAQ ..........................................................................................................................................................14

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1DEFINITIONS AND ACRONYMS
1.1 DEFINITIONS
Item
Definition
Backlight
Lighting which illuminates the letters, lines or other features of a panel from the inside or
back of the module. See pictures below.
Pointer
Like the hands of a clock
1.2 ACRONYMS
Item
Definition
PCB
Printed Circuit Board
MAN
UTC
Coordinate Universal Time
ET
Elapsed time
RUN/HLD
CHR
Chronometer
2PRELIMINARY NOTES
Sismo would like to thank to Mr. Jan Willem Severijnen from Holland for his suggestions for improving this
manual.
3INTRODUCTION
This 737NG Clock V3.5 from Sismo is a "stand alone" module and is fully operational without the need to be
connected to any I/O card or PC. It uses a battery to keep time and it can be adjusted by the user. The clock
operates like the real one and includes the modes: MAN/UTC, DAY/MO/YR, ET/CHR, RUN/HLD.
There are two different versions available:
Alpha Version, which is the full version with backlighting and pointer (engine).
Bravo Version, which does not include a pointer and engine
The clocks gives time reference to the flight crew and other airplane systems. The clock displays the
following data:
Time and date UTC or set manually from the clock.
Elapsed time.
Chronograph time.

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4INSTALLATION
No special driver or software installation is necessary, simply connect it to a power supply of 12V and 2A.
There are two options for supplying electricity to the clock:
A) If the 737Clock is NOT going to be dimmed with an extra “dimming circuit” for backlight
(NOTE: Clock will work and backlight will switch ON, you only won’t be able to dim the backlight) * Connect U8 jumper. (Leave plugged)
1- Connect 12V DC power supply directly to the available 12V black connector placed on the
backpanel of the 737NG Clock.
In V3.1 the name of this connector is C12V. In V3.5 the connector is 12V.
B) If the 737Clock is going to be dimmed with an extra “dimming circuit” for backlight
(NOTE: The 12V supply of section A is also needed) * Remove U8 jumper
1- Connect 12V DC power supply directly to the available 12V black connector placed on the
backpanel of the 737NG Clock.
In V3.1 the name of the connector is C12V. In V3.5 the connector is 12V.
2- To connect the backlight in V3.1, connect a 12V power supply to the available green terminal 12V.
To connect the backlight in V3.5, connect a 12V power supply to 12V-DIM.
*Note: Pay attention when plug positive with (+) and don´t invert the poles, otherwise the clock may be damaged.
V 3.1
V 3.5
Power Supply Connector:
CAUTION!
Keep hands out of the PCBs (backpanels) while the 737NG Clock is switched ON

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5MAINTENACE
The only maintenance this module requires is to replace the battery when it’s empty. This component
stores the information about time and date introduced by the user.
The type/brand of this battery has to be CR2032 3V. It’s a standard battery that you can buy in any
hardware store of your city.
6FUNCTIONALITY
The clock has got 3 fundamental functions:
TIME/DATE
ELAPSED TIME
CHRONOMETER
If the user wants to control the backlight using the MAIN
PANEL Bright potentiometer from the PRM CBC, he/she
needs to use a dimming circuit to dim the backlighting of the
737 Clock as in option B.

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6.1 TIME/DATE FUNCTION
The TIME/DATE push button controls the different modes the clock can be switched to. The TIME/DATE
function has 4 modes of operation.
All the relating information to TIME/DATE appears in the top display.
UTC TIME: This information is extracted in the real plane from the GPS(GLOBAL POSITIONING
SYSTEM) but as this unit is a Stand-Alone module, the UTC hour must be set manually and saved in
a memory for its posterior use. Once the UTC hour is set, it will not be necessary to re-establish it
until the battery of lithium is exhausted.
UTC DATE: this information is extracted in the real plane from the GPS(GLOBAL POSITIONING
SYSTEM) but as this unit is a Stand-Alone module, the UTC date must be set manually and saved in
a memory for its posterior use. Once the UTC date is set, it will not be necessary to re-establish it
until the battery of lithium runs out.
MAN TIME: this information is extracted in the real plane from the clock but as this unit is a Stand-
Alone module, the MAN hour (local time) must be set manually and saved in a memory for its
posterior use. The MAN hour must be set according to the geographic zone where the clock is going
to be used. Once the MAN hour is set, it will not be necessary to re-establish it until the battery of
lithium is dead.
MAN DATE: this information is extracted in the real plane from the clock but as this unit is a Stand-
Alone, the MAN date (local date) must be set manually and saved in a memory for its posterior use.
The MAN date must be set according to the geographic zone where the clock is going to be used.
Once the MAN date is set, it will not be necessary to re-establish it until the battery of lithium
needs to be replaced.

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7TIME/DATA CONFIGURATION
Configuring the TIME/DATE in any of its 4 modes is a simple process and the steps are detailed below:
Note: Change the UTC TIME and UTC DATE before changing the MAN TIME and MAN DATE. Otherwise, the
data of MAN TIME and MAN DATE will vary.
UTC TIME: follow these steps to configure the UTC TIME:
1. The clock must be set to show the information (in the top display) corresponding to TIME UTC. To
do that correctly, press TIME/DATE until you can see that TIME is switched on and DAY, MO and YR
are switched off. UTC must also be switched on.
2. Push RESET+CHR at the same time (first RESET and then CHR, otherwise we will activate the
Chronometer mode). This step is used for putting the clock in configuration mode. Then, the hour
digits will start to blink.
3. Modify the hour digits with the +/- push-buttons and stop when you have the correct hour UTC.
4. After that, push SET and the minute’s digits will start to blink.
5. Proceed with the same operation and adjust the digits with the +/-push-buttons.
6. Once this operation is finished, push SET again and the information of the UTC TIME will be stored
in the system.
UTC DATE: follow these steps to configure the UTC date

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1. The clock must be set to show the information (in the top display) corresponding to DATE UTC. To
do that correctly, press TIME/DATE until you can see that DAY, MO and YR are switched on and
TIME is switched off. UTC must also be switched on.
2. Push at the same time the buttons RESET+CHR (first RESET and later CHR, otherwise we will
activate the Chronometer mode). This step is used for putting the clock in configuration mode.
Then, the hour digits will start to blink.
3. Modify the DAY digits with the +/- push-buttons and stop when you have the correct day UTC.
4. After that, push SET and the MONTH digits will start to blink.
5. Make the same operation of to adjust the digits with the +/- push-buttons.
6. After that, push SET and the YEAR digits will start to blink.
7. Make the same operation of to adjust the digits with the +/-push-buttons.
8. Once this operation is finished, return to push again SET and the information of the UTC DATE will
store in the system.
MAN TIME: follow these steps to configure the UTC hour
1. The clock must be set for showing the information (in the top display) corresponding to TIME MAN.
To do that correctly, press TIME/DATE until you can see that TIME is switched on and DAY, MO and
YR are switched off. MAN must also be switched on.
2. Push the SET buttons. This step is used for putting the clock in configuration mode. Then, the hour
digits will start to blink.
3. Modify the hour digits with the +/- push-buttons and stop when you have the correct hour MAN.
4. After that, push SET and the minutes digits will start to blink.
5. Make the same operation of to adjust the digits with the +/- push-buttons.
6. Once this operation is finished, return to push again SET and the information of the MAN TIME will
store in the system.

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MAN DATE: for setting the MAN date it is necessary to follow the next steps:
1. The clock must be set to show the information (in the top display) corresponding to DATE MAN. To
do that correctly, press TIME/DATE until you can see that DAY, MO and YR are switched on and
TIME is switched off. MAN must also be switched on.
2. Push the SET buttons. This step is used for putting the clock in configuration mode. Then, the hour
digits will start to blink.
3. Modify the DAY digits with the +/- push-buttons and stop when you have the correct day UTC.
4. After that, push SET and the MONTH digits will start to blink.
5. Make the same operation of to adjust the digits with the +/- push-buttons.
6. After that, push SET and the YEAR digits will start to blink.
7. Make the same operation of to adjust the digits with the +/- push-buttons.
8. Once this operation is finished, return to push again SET and the information of the MAN DATE will
store in the system.

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7.1 ELAPSED TIME
The ELAPSED TIME function shows the time of flight, but it must be initiated by the user. The information of
the ELAPSED TIME appears in the lower display. When ELAPSED TIME is selected, the led ET together with
the mode of operation RUN or HLD which depend on the functionality for the clock will be switched on.
The hours and minutes are shown in the display but not for the seconds.
If the ET button is pressed again, the counter restarts and LED RUN switches on while HOLD switches off.
To initiate the ELAPSED TIME mode it is necessary to push the ET push-button once. After that, the time will
start to count and the LED RUN is switched on. If we push the ET push-button again, the ELAPSED TIME will
stop and the LED HOLD is switched on and LED RUN is switched off. If the ET push-button is again pushed, it
begins again to count returning the LED RUN to on and HOLD to off.
If we push the RESET push-button when the count is active (RUN to on), a reset of the counter will be done
returning all the digits to zero and initiating a new count.
Otherwise, if we push the RESET push-button when the ELAPSED TIME is with HOLD to on, this reset will
make a reset of the ELAPSED TIME showing all the digits to zero and switching off the lower display 5
seconds later. All the LEDs related to ELAPSED TIME will also be switched off.
The function ELAPSED TIME is secondary to the system, which is to say that if the ELAPSED TIME is selected
and we also push the CHR function (Chronometer), all the information of the ELAPSED TIME will disappear
from the lower display for showing the information of the chronometer. The ELAPSED TIME continues
working in the background and when the chronometer is removed, the ELAPSED TIME function returns to
show its information in the lower display.

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Note: Just as ELAPSED TIME mode works in the real plane, you will only need to dial in the display the hours
and minutes (ELAPSED TIME has not seconds).
7.2 CHRONOGRAPH FUNCTION
To activate the Chronometer function, we must push the CHR push-button, so a count is initiated showing
the minutes in the lower right display and the seconds by means of a gyratory needle over the sphere of
the clock (only available in ALPHA Version). The CHR led will also be switched on.
If we push the CHR push-button again, the count will stop.
If we push the CHR push-button another time, a reset of the chronometer will be done switching off the
lower display and making the needle of the second-hand go to its initial position in the least possible time.
This function has priority over the ELAPSED TIME. If the information that appears in the lower display is the
ELAPSED STOLE data, this information will disappear and the information of the Chronometer will appear.
But it is important to know that the information of the ELAPSED TIME is not lost, it only continues working
on the second plane. Once the Chronometer is deactivated, the information of the ELAPSED TIME returns
to be shown in the lower display

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Note: in the function CHRONO, the bravo Version has not got a needle to show the seconds, then CHR
mode can only visualize the minutes and hours.
8MEASUREMENTS

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9AVAILABLE PRODUCTS
737NG Clock is available in two different lines:
•Alpha Version, which is the full version with backlighting and pointer (engine).
•Bravo Version, which does not include a pointer and engine.
Prices and further info in: www.sismo-soluciones.com
9.1 PICTURES
ALPHA LINE S737-MIP-G-AL-A35B-0206
BRAVO LINE S737-MIP-G-BL-A35-0204

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10 FAQ
# Each time the Clock is switched OFF, the time must be set again?
Once the Time is set the first time, it keeps the Time saved even when it is switched off from the power
supply.
The Clock saves and keeps the time through the round battery installed on the Clock, and this functionality
will not work if the battery run out.
This issue will be solved by changing the battery for a new one.
After changing the battery, the Chrono will work again.
# The Chrono does not work
The battery is also used to make the Chrono run, and this functionality will not work if the battery run out.
This issue will be solved by changing the battery for a new one.
END OF DOCUMENT