ONLY DIVERS TRAINED IN THE PROPER USE OF SCUBA DIVING EQUIPMENT SHOULD USE A DIVE COMPUTER! No dive computer can replace the need for proper dive training. Insufcient or improper training may cause diver to commit errors that may lead to serious injury or death.
THERE IS ALWAYS A RISK OF DECOMPRESSION ILLNESS (DCI) FOR ANY DIVE PROFILE EVEN IF YOU FOLLOW THE DIVE PLAN PRESCRIBED BY DIVE TABLES OR A DIVE COMPUTER. NO PROCEDURE, DIVE COMPUTER OR DIVE TABLE WILL PREVENT THE POSSIBILITY OF DCI OR OXYGEN TOXICITY! An individuals physiological make up can vary from day to day. The dive computer cannot account for these variations. You are strongly advised to remain well within the exposure limits provided by the instrument to minimize the risk of DCI. As an added measure of safety, you should consult a physician regarding your tness before diving.
SUUNTO STRONGLY RECOMMENDS THAT SPORT DIVERS LIMIT THEIR MAXIMUM DEPTH TO 40 M [130 FT] OR TO THE DEPTH CALCULATED BY THE COMPUTER BASED ON THE SELECTED O2% AND A MAXIMUM PO2 OF 1.4 BAR!
DIVES WITH REQUIRED DECOMPRESSION STOPS ARE NOT RECOMMENDED. YOU SHOULD ASCEND AND BEGIN DECOMPRESSION IMMEDIATELY WHEN THE DIVE COMPUTER SHOWS YOU THAT A DECOMPRESSION STOP IS REQUIRED! Note the blinking ASC TIME symbol and the upward pointing arrow.
USE BACK-UP INSTRUMENTS! Make sure that you use back-up instrumentation including a depth gauge, submersible pressure gauge, timer or watch, and have access to decompression tables whenever diving with the dive computer.
PERFORM PRECHECKS! Always activate and check the device before diving in order to ensure that all Liquid Crystal Display (LCD) segments are completely displayed, that the device has not run out of battery power, and that the oxygen, altitude and personal adjustments are correct. Also, exit the Data Transfer (TR-PC) mode before diving, as the computer does not automatically revert to Dive mode from Data Transfer mode.
YOU ARE ADVISED TO AVOID FLYING ANY TIME THE COMPUTER COUNTS DOWN THE NO-FLYING TIME. ALWAYS ACTIVATE THE COMPUTER TO CHECK THE REMAINING NO-FLY TIME PRIOR TO FLYING! The computer goes into the stand-by display automatically 5 minutes after the dive has ended. The stand-by display shuts off after two hours. Flying or traveling to a higher altitude within no-y time can greatly increase the risk of DCI. Review the recommendations given by Divers Alert Network (DAN) in chapter 3.6.3. Flying After Diving. There can never be a ying after diving rule that is guaranteed to completely prevent decompression illness!

THE DIVE COMPUTER SHOULD NEVER BE TRADED OR SHARED BETWEEN USERS WHILE IT IS IN OPERATION! Its information will not apply to someone who has not been wearing it throughout a dive or sequence of repetitive dives. Its dive proles must match that of the user. If it is left on the surface during any dive, it will give inaccurate information for subsequent dives. No dive computer can take into account dives made without the computer. Thus any diving activity up to four days prior to initial use of the computer may cause misleading information and must be avoided.
DO NOT EXPOSE THE VYTECS OPTIONAL PRESSURE TRANSMITTER TO ANY GAS MIX CONTAINING MORE THAN 40% OXYGEN! Enriched air with greater oxygen content presents a risk of re or explosion and serious injury or death.
DO NOT DIVE WITH A CYLINDER OF ENRICHED AIR IF YOU HAVE NOT PERSONALLY VERIFIED ITS CONTENTS AND ENTERED THE ANALYZED VALUE INTO YOUR DIVE COMPUTER! Failure to verify cylinder contents and enter the appropriate O2% into your dive computer will result in incorrect dive planning information.
THE DIVE COMPUTER WILL NOT ACCEPT FRACTIONAL PERCENTAGE VALUES OF OXYGEN CONCENTRATION. DO NOT ROUND UP FRACTIONAL PERCENTAGES! For example, 31.8% oxygen should be entered as 31%. Rounding up will cause nitrogen percentages to be understated and will affect decompression calculations. If there is a desire to adjust the computer to provide more conservative calculations, use the personal adjustment feature to affect decompression calculations or reduce the PO2 setting to affect oxygen exposure.
SET THE CORRECT ALTITUDE ADJUSTMENT MODE! When diving at altitudes greater than 300 m [1000 ft] the Altitude Adjustment feature must be correctly selected in order for the computer to calculate the decompression status. The dive computer is not intended for use at altitudes greater than 3000 m [10000 ft]. Failure to select the correct Altitude Adjustment setting or diving above the maximum altitude limit will result in erroneous dive and planning data.

WARNING:

In case there are several divers using Vytecs with wireless transmission always ensure that all divers are on different codes before starting the dive.
The selected transmission code can later be veried via the alternative display, by pressing the TIME button twice. If needed, the stored code can be manually erased in this display by pressing the PLAN (up) button and then pressing MODE (select). The Vytec will now erase the stored code and start displaying SETC allowing a new pairing with the transmitter. The alternative display showing the selected code reverts to the main display after 15 seconds in order to avoid accidental code changes. The user can manually change the transmitters code by reducing the pressure to less than 10 bar [145 psi] and then immediately (within 10-12s) increasing the pressure above 15 bar [220 psi]. The transmitter will now select a new code. The wrist unit must be in SETC mode to pair on the new code. This procedure can be used e.g. if your dive buddy has the same code and you need to change the code. NOTE: In order to save battery energy the transmitter shuts off if the pressure remains unchanged for more than 5 minutes and it will continue transmitting with the saved code when any pressure change is measured.

DIVE TIME

2.4.3. Transmission Data
Fig 2.6. Pressure transmission related displays.
After the pairing procedure the Vytec will receive cylinder pressure data from the transmitter. The pressure is displayed in either bars or psi depending on the unit selection. Any time the Vytec receives an appropriate signal it ashes the lightning gure in the displays lower left corner. A pressure reading of over 360 bar [5220 psi] will display as --- (Fig. 2.6 b). If the Vytec is unable to receive a valid signal for more than one minute it will start displaying FAIL intermittently with the latest valid pressure reading (Fig. 2.6 c).
In case the transmitter battery is running low, a low battery warning LOBT will be transmitted and displayed intermittently with the pressure reading on the Vytec (Fig.2.6 d). If the dive is started without that the Vytec and the transmitter have been properly paired, the Vytec will indicate that no cylinder data is available by displaying OFF (Fig. 2.6 e).

the Personal Adjustment setting on the left side of the center window with a diver symbol and + signs (P0, P1, or P2) (see Table 3.5.) the Diver Attention Symbol if attenuated RGBM has been set (see Table 3.3.) blinking Diver Attention Symbol if surface interval should be prolonged (see Table 3.3.)
Fig. 3.10. Bookmark In addition with the optional wireless transmisactivation. An annotation, sion enabled: Bookmark, is placed in the prole memory during the Remaining Air-time in the left a dive by pressing PLAN center window button. Note the Logbook the cylinder pressure in bar [or psi] symbol.
displayed in the lower left corner

MAX STOP

Alternative displays by pressing the TIME button (Fig. 3.9.): the current time, shown as TIME the water temperature in C [F] NOTE! In Dive Mode the alternative display switches back to the main display after 5 seconds.

3.3.2. Bookmark

Fig. 3.11. A three minute Recommended Safety Stop.
It is possible to make special marks in the prole memory during a dive. These Bookmarks will be shown as a dive log symbol when scrolling the prole memory on the computer display. The Bookmarks will also be shown as annotations in the PC-software, Suunto Dive Manager. To make a bookmark on the prole memory during a dive press the PLAN button (Fig. 3.10.).
3.3.3. Cylinder Pressure Data
When using the optional wireless pressure transmitter the pressure of your scuba cylinder in bars [psi] will be shown digitally in the lower left corner of the display Anytime you enter into a dive, the remaining air time calculation begins. After 30 - 60 seconds (sometimes more, depending on your air consumption), the rst estimation of remaining air time will be
Fig. 3.12. Cylinder pressure warnings. Pressure has dropped below 50 bar [725 psi]. Pressure display is blinking and there is an audible alarm.
shown in the left center window of the display. The calculation is always based on the actual pressure drop in your cylinder and will automatically adapt to your cylinder size and current air consumption. The change in your air consumption will be based on constant one second interval pressure measurements over 30 - 60 second periods. An increase in air consumption will inuence the remaining air time rapidly, while a drop in air consumption will increase the air time slowly. Thus a too optimistic air time estimation, caused by a temporary drop in air consumption, is avoided. The remaining air time calculation includes a 35 bar [500 psi] safety reserve. This means that when the instrument shows the air time to be zero, there is still about 35 bar [500 psi] pressure left in your cylinder depending on your air consumption rate. With a high consumption rate the limit will be close to 50 bar [725 psi] and with a low rate close to 35 bar [500 psi]. NOTE! Filling your BC will affect the air time calculation, due to the temporary increase in air consumption. NOTE! A change of temperature will affect the cylinder pressure and consequently the air time calculation. Low Air Pressure Warnings The dive computer will warn you with three audible double beeps and a blinking pressure display when the cylinder pressure reaches 50 bar [725 psi] (Fig. 3.12.). Three double beeps are also heard when the cylinder pressure goes down to the user selected alarm pressure and when the remaining air time reaches zero.

CEILING, CEILING ZONE, FLOOR AND DECOMPRESSION RANGE
When in decompression, it is important that you understand the meaning of ceiling, oor, and decompression range (Fig. 3.20.): The ceiling is the shallowest depth to which you should ascend when in decompression. At this depth, or below, you must perform all stops. The ceiling zone is the optimum decompression stop zone. It is the zone between the minimum ceiling and 1.8 m [6 ft] below the minimum ceiling. The oor is the deepest depth at which the decompression stop time will not increase. Decompression will start when you pass this depth during your ascent. The decompression range is the depth range between the ceiling and oor. Within this range, decompression takes place. However, it is important to remember that the decompression will be very slow at, or close to, the oor. The depth of the ceiling and oor will depend on your dive prole. The ceiling depth will be fairly shallow when you enter the decompression mode, but if you remain at depth, it will move downward and the ascent time will increase. Likewise, the oor and ceiling may change upwards while you are decompressing. When conditions are rough, it may be difcult to maintain a constant depth near the surface. In this case it will be more manageable to maintain an additional distance below the ceiling, to make sure that the waves do not
lift you above the ceiling. Suunto recommends that decompression takes place deeper than 4 m [13 ft], even if the indicated ceiling is shallower. NOTE! It will take more time and more air to decompress below the ceiling than at the ceiling.
NEVER ASCEND ABOVE THE CEILING! You must not ascend above the ceiling during your decompression. In order to avoid doing so by accident, you should stay somewhat below the ceiling.

DISPLAY BELOW THE FLOOR

The blinking ASC TIME and an upward pointing arrow indicate that you are below the oor (Fig. 3.16.). You should start your ascent immediately. The ceiling depth is shown on the right top corner and the minimum total ascent time on the right side of the center window.

DISPLAY ABOVE THE FLOOR

When you ascend above the oor, the ASC TIME display stops blinking and the upward pointing arrow disappears (Fig. 3.17.). Decompression will now begin, but is very slow. You should therefore continue your ascent.
Fig. 3.15. Violated Mandatory Safety Stop. Downward pointing arrow and an audible alarm indicate you should descend to ceiling zone.
DISPLAY AT THE CEILING ZONE

for at least 48 hours.

in the Planning Mode will increment to the next higher number if another dive is made.
TABLE 3.3. WARNING SYMBOLS
3.6.3. Flying After Diving
The no-ying time is shown in the center window next to the airplane image. Flying or travelling to a higher altitude should be avoided at any time the computer counts down the no-ying time. NOTE! The airplane symbol is not shown on the stand-by display. You should always activate the dive computer and check that the airplane symbol is not displayed prior to ying. The no-ying time is always at least 12 hours or equivalent to the socalled desaturation time (if longer than 12 hours). In the permanent Error mode and Gauge mode the no-ying time is 48 hours. Divers Alert Network (DAN) recommends the following on no-ying times: A minimum surface interval of 12 hours would be required in order to be reasonably assured a diver will remain symptom free upon ascent to altitude in a commercial jetliner (altitude up to 2400 m [8000 ft]). Divers who plan to make daily, multiple dives for several days, or make dives that require decompression stops, should take special precautions and wait for an extended interval beyond 12 hours before ight. Further, the Undersea and Hyperbaric Medical Society (UHMS) suggests divers using standard air cylinders and exhibiting no symptoms of decompression illness wait 24 hours after their last dive to y in an aircraft with cabin pressure up to 2400 m [8000 ft]. The only two exceptions to this recommendation are:
If a diver had less than 2 hours total accumulated dive time in the last 48 hours, then a 12 hour surface interval before ying is recommended. Following any dive that required a decompression stop, ying should be delayed for at least 24 hours, and if possible, for 48 hours. Suunto recommends that ying is avoided until all the DAN and UHMS guidelines and the dive computer wait to y conditions are satised.
3.7. AUDIBLE AND VISUAL ALARMS
The dive computer features audible and visual alarms to advise when important limits are approached or to acknowledge preset alarms. A short single beep occurs, when: the dive computer is activated. when the dive computer automatically returns to the TIME mode. Three double beeps occur, when: the cylinder pressure reaches 50 bar [725 psi]. The cylinder pressure display will start to blink (Fig. 3.12.). the cylinder pressure reaches the selected alarm pressure. the calculated remaining air time reaches zero. Three single beeps with a two second interval and the backlight activated for 5 seconds occur, when: the no-decompression dive turns into a decompression stop dive. An arrow pointing upwards and the blinking ascent warning ASC TIME will appear (Fig. 3.16.). Gas change is prompted Continuous beeps and the backlight activated for 5 seconds occur, when: the maximum allowed ascent rate, 10 m/min [33 ft/min], is exceeded. SLOW and STOP warnings will appear (Fig. 3.13.). the Mandatory Safety Stop ceiling is exceeded. A downward pointing arrow will appear (Fig. 3.15.). the decompression ceiling depth is exceeded. An error warning Er and a downward pointing arrow appear. You should immediately descend to, or below, the ceiling. The instrument will otherwise enter a permanent Error Mode within three minutes, indicated by a permanent Er (Fig. 3.19.).

Altitude mode A0 A1 A2 Symbol on display Altitude range 0 - 300 m [0 - 1000 ft] 300 - 1500 m [1000 - 5000 ft] 1500 - 3000 m [5000 - 10000] ft]
The entered Altitude Adjustment Mode is indicated by mountain symbols (A0, A1 = one mountain, or A2 = two mountains). Section 4.3.1.1. Altitude Adjustment and Personal Adjustment Setting describes how the Altitude Mode is adjusted. Traveling to a higher elevation can temporarily cause a change in the equilibrium of dissolved nitrogen in the body. It is recommended that you acclimate to the new altitude by waiting at least three hours before making a dive.
3.8.2. Personal Adjustment
There are adverse personal factors for DCI which divers can predict in advance and input into the decompression model. Factors that may affect susceptibility to decompression illness vary between divers and also for the same diver from one day to another. The three-step Personal Adjustment Mode is available, if a more conservative dive plan is desired. For very experienced divers, a two step adjustment for RGBM effect on repetitive dives is available. The personal factors which tend to increase the possibility of DCI include, but are not limited to:
cold exposure - water temperature less than 20 C [68 F] the diver is below average physical tness level diver fatigue diver dehydration previous history of DCI stress obesity
The Personal Adjustment Mode is indicated by a diver symbol and plus signs (P0 = a diver, P1 = diver +, or P2 = diver ++). Section 4.3.1.1. Altitude Adjustment and Personal Adjustment Setting describes how the Personal Mode is adjusted. This feature should be used to adjust the computer to be more conservative, according to personal preference, by entering the suitable Personal Adjustment Mode with the help of Table 3.5. In ideal conditions, retain the default setting, P0. If conditions are more difcult or other mentioned factors which tend to increase the possibility of DCI exist, select P1 or even the most conservative P2. As a result the dive computer adjusts its mathematical model according to the entered Personal Adjustment Mode, giving shorter no-decompression times (see section 6.1. Operating Principles, Table 6.1 and 6.2).
TABLE 3.5. PERSONAL ADJUSTMENT RANGES
The Vytec also allows experienced divers who are willing to accept a greater level of risk to adjust the RGBM model. The default setting is RGB100 which gives full (100%) RGBM effect. Suunto strongly advises to use full RGBM effect. Statistically very experienced divers have less incidents with DCI. The reason for this is unknown, but it is possible that some level of physiological and or psychological accommodation can take place when you are very experienced as a diver. Thus for certain divers and diving conditions you may want to set attenuated (50%) RGBM
mode (RGB50). See Table 3.6. To advise the diver that attenuated RGBM has been set, the Diver Attention Symbol is constantly displayed (Table 3.3.)

TABLE 3.6. RGBM MODEL SETTINGS

3.9. ERROR CONDITIONS

The dive computer has warning indicators that alert the user to react to certain situations that would signicantly increase the risk of DCI. If you do not respond to its warnings, the dive computer will enter an Error Mode, indicating that the risk of DCI has greatly increased. If you understand and operate the dive computer sensibly, it is very unlikely you will ever put the instrument into the Error Mode.

OMITTED DECOMPRESSION

The Error Mode results from omitted decompression, i.e. when you stay above the ceiling for more than three minutes. During this three-minute period the Er warning is shown and the audible alarm beeps. After this, the dive computer will enter a permanent Error Mode. The instrument will continue to function normally if you descend below the ceiling within this three-minute period. Once in the permanent Error Mode only the ER warning is shown in the center window. The dive computer will not show times for ascent or stops. However, all the other displays will function as before to provide information for ascent. You should immediately ascend to a depth of 3 to 6 m [10 to 20 ft] and remain at this depth until air supply limitations require you to surface. After surfacing, you should not dive for a minimum of 48 hours. During the permanent Error Mode, the Er text will be displayed in the center window and the Planning Mode will be disabled.

4. MENU BASED MODES

To make yourself familiar with the menu based functions, please use your Quick Reference Guide supplied with the Vytec together with the information in this chapter. The main menu based functions are grouped under 1) memory, 2) dive simulation and 3) setting modes.
THE USE OF THE MENU BASED FUNCTIONS
1. Activate the menu based modes by pressing once the SMART (MODE) button in the Dive Mode (Fig. 4.1.). 2. Scroll the mode options by pressing the arrow up/down buttons. When scrolling the options, the label and an equivalent number are shown on the display (Fig. 4.2. 4.4.). 3. Press the SMART (Select) button once to select the desired option. 4. Scroll the submode options by pressing the arrow up/down buttons. When scrolling the options, the label and an equivalent number are shown on the display. 5. Select the desired option by pressing once the SMART (Select) button. Repeat the procedure, if there are more submodes. 6. Depending on the mode, you are now able to have a look at the memories, simulate a dive, or make desired settings (use the the arrow up/down buttons). The SMART button is used to Quit or to conrm the settings (OK). If you do not press any of the buttons for 5 minutes while in a Menu based mode, the instrument beeps and returns to the timekeeping display. In the Simulation Mode, however, the equivalent time is 60 minutes.

page 1

Fig. 4.6. Logbook option. [1 LOGBOOK].
Fig. 4.7. Logbook, page I. Scroll different pages of specic dive.

page 2

When Select is displayed next to the mode button the scroll buttons will scroll through the four pages of the selected dive. The END text is displayed between the oldest and most recent dive. (Fig. 4.12.) Note that chronological sequence in the logbook is determined by the date, not by the dive number. The following information will be shown on four pages: Page I, main display (Fig. 4.7.) dive number in the dive series dive entry time and date. Page II (Fig. 4.8.) dive number in the dive series maximum depth (NOTE! Due to lower resolution, the reading may differ from the maximum depth reading of the Dive History up to 0.3 m [1 ft].) total dive time temperature at the maximum depth Altitude Adjustment setting (not displayed in Gauge mode) Personal Adjustment setting (not displayed in Gauge mode) SLOW label, if the diver has violated the maximum ascent rate STOP label, if the Mandatory Safety Stop was violated ASC TIME label, if the dive was a decompression stop dive Diver attention symbol, if the symbol was displayed when dive was started downward pointing arrow, if the ceiling was violated oxygen percentage (in Nitrox mode for primary gas MIX1) maximum OLF during the dive (only in Nitrox mode).
Fig. 4.8. Logbook, page II. Main dive related data.

page 3

Fig. 4.9. Logbook, page III. Surface interval time, average depth and consumed air indicated by P.

page 4

Fig. 4.10. Logbook, page IV. Prole of specic dive.
Page III (Fig. 4.9.) dive number in the dive series average depth surface interval time before the dive DP describing Cylinder pressure drop during the dive (if wireless transmission enabled (HP on)). Page IV (Fig. 4.10.) dive number in the dive series the prole of the dive, automatic scrolling during which: logbook symbol blinks at the point when the user has pressed the PLAN button for Bookmark O2% during the dive prole (in Nitrox mode, O2% will change with gas change) blinking SLOW label when registered blinking ASC TIME label when the dive became a decompression dive. Press the SMART (Select) button once to change the scroll buttons to scroll the different dives forward and backward (Fig. 4.11.). Press the SMART (>Select) button again to change function of the scroll buttons back to scroll the different pages of the selected dive. When searching the dives, only the page 1 is shown. The END text is displayed between the oldest and the most recent dive (Fig. 4.12.). The memory will retain approximately the last 36 hours of dive time. After that, when new dives are added, the oldest dives are deleted. The contents of the memory will remain when the battery is changed (assuming that the replacement has been done according to the instructions).

Fig. 4.11. Logbook, page I. Press SMART (Select) button once to be able to scroll between different dives.
Fig. 4.12. Logbook, end of the memory. END text is displayed between oldest and the most recent dive.
Fig. 4.13. Dive History Memory Mode. [2 HISTORY].
DIVE PROFILE MEMORY [PROF]

DIVE MAX

The scrolling of the prole will start automatically when the Logbook page IV (PROF) is entered. With the default setting, the dive prole is recorded and displayed in 20-second increments with each display being shown for about three seconds. The depths shown are the maximum values of each interval. Pressing any button stops the scrolling of the prole. NOTE! Several repetitive dives are considered to belong to the same repetitive dive series if the no-ying time has not ended. See Dive Numbering in section 3.6.2. for further information.
Fig. 4.14. Dive History information. Total number of dives, dive hours and maximum depth.
4.1.2. Dive History Memory [2 HISTORY]
The Dive History is a summary of all the dives recorded by the dive computer. To enter the Dive History Memory Mode select MODE- 1 MEMORY- 2 HISTORY (Fig. 4.13.). The following information will be shown on the display (Fig. 4.14.): the maximum depth ever reached the total accumulated dive time in hours the total number of dives. The Dive History Memory can hold a maximum of 999 dives and 999 diving hours. When these maximum values are reached, the counters will start again from zero. NOTE! The maximum depth can be reset to 0.0 m [0 ft] using the optional PC-Interface unit and Suunto Dive Manager software.
Fig. 4.15. Data Transfer mode. [3 TR-PC].
Fig. 4.16. Dive Simulation options. [2 SIMUL].
4.1.3. Data Transfer and PC-Interface [3 TR-PC]
The instrument can be connected to an IBM compatible personal computer (PC), using the optional PC-Interface and software. With the PCInterface unit, dive data from the dive computer can be downloaded to a PC. The PC software can be used for educational and demonstration purposes, for planning dives, and for keeping a complete record of your dive history with the instrument. Additional Logbook data can also be added. Paper copies of your dive log and proles can easily be printed. The data transfer is carried out using the connector on the bottom of the unit. The following data is transferred to the PC: depth prole of the dive dive time preceding surface interval time dive number Altitude and Personal adjustment settings oxygen percentage settings and maximum OLF (in Nitrox mode) tissue calculation data temperature at the beginning of the dive, maximum depth and end of the dive dive entry time (year, month, day and time) additional dive information (e.g. SLOW and Mandatory Safety Stop violations, Diver Attention Symbol, Bookmark, Surfaced Mark, Decompression Stop Mark, Ceiling Error Mark,gas change) dive computer serial number personal 30 character information cylinder pressure at the beginning and at the end of the dive (i.e. pressure drop DP during dive) surface air consumption. Using the PC software, you are able to enter setup options such as: input a personal, 30 character eld into the Vytec (i.e. your name) reset the Dive Historys max depth to zero. It is also possible to manually add comments and other personal information to the PC based dive data les. The PC-Interface package comes complete with the interface unit, the software and an installation guide. To enter the Data Transfer mode select MODE- 1 MEMORY- 3 TR PC (Fig. 4.15.).

Fig. 4.32. Adjusting Daily Alarm.
NOTE! When the backlight turned OFF, it does not illuminate when an alarm is given.
4.3.3.2. Dive Computer Units Setting [2 UNITS]
To enter the Dive Computer Units Setting mode, select MODE- 3 SET- 3 SET PREF- 2 UNITS. This will enable you to choose between metric and imperial units (Fig. 4.34.).
Fig. 4.33. Setting Backlight On Time. Press scroll buttons to change backlight on/off and to set time value.
4.3.3.3. Wireless Transmission Settings [3 HP]
The wireless transmission can be set ON or OFF depending on if the optional wireless pressure transmitter is used or not. No cylinder pressure related data is shown or data reception made when this selection is off. You can set the secondary cylinder pressure alarm point. The 50 bar alarm is xed and cannot be changed. The 35 bar secondary alarm pressure can be set in the range 10 200bar. To set the wireless transmission settings select MODE- 3 SET- 3 SET PREF- 3 HP
Fig. 4.34. Setting Metric/ Imperial units.
4.3.3.4. Prole Sample Rate Setting [4 REC]
You can set dive prole sample rate to 10, 20, 30 or 60 seconds. To adjust the sampling rate select MODE- 3 SET- 3 SET PREF- 4 REC. The factory default setting is 20 seconds.
4.3.3.5. Dive Computer Model Setting [5 MODEL] AIR/NITROX/GAUGE
In the Dive Computer Model Setting mode the dive computer can be set to be an AIR computer, NITROX computer or a depth GAUGE with a timer (Fig. 4.35.). To enter the Dive Computer Model Setting mode select MODE- 3 SET- 3 SET PREF- 5 MODEL.
Fig. 4.35. Setting Dive Computer model.

5. CARE AND MAINTENANCE

This SUUNTO dive computer is a sophisticated precision instrument. Though designed to withstand the rigors of scuba diving you must treat it with proper care and caution as any other precision instrument.
5.1. IMPORTANT INFORMATION
WATER CONTACTS AND PUSH BUTTONS Contamination or dirt on the water contacts/connector or push buttons may prevent the automatic activation of the Dive Mode and cause problems during the data transfer. Therefore, it is important that the water contacts and push buttons are kept clean. If the water contacts of the instrument are active (AC-text remains on display) or the Dive Mode activates on its own, the reason for this is probably contamination or invisible marine growth that may create an unwanted electric current between the contacts. It is important that the dive computer is carefully washed in fresh water after the days diving is completed. The contacts can be cleaned with fresh water and, if necessary, a mild detergent and a soft brush. Sometimes it might be necessary to remove the instrument from the protective boot for cleaning.
5.2. CARE OF YOUR DIVE COMPUTER
NEVER try to open the case of the dive computer. Service your dive computer every two years or after 200 dives (whichever comes rst) by an authorized dealer or distributor. This service will include a general operational check, replacement of the battery, and water resistance check. The service requires special tools and training. Therefore, it is advisable to contact an authorized SUUNTO dealer or distributor for biennial service. Do not attempt to do any service that you are not sure about how to do. Should moisture appear inside the case or battery compartment have the instrument checked immediately by your SUUNTO dealer or distributor. Should you detect scratches, cracks or other such aws on the display that may impair its durability, have it replaced immediately by your SUUNTO dealer or distributor. Check the spring bars holding the strap and the buckle for aws. If the exibility of the spring bars has reduced, have them replaced immediately by your SUUNTO dealer or distributor. Wash and rinse the unit in fresh water after every use.

Protect the unit from shock, extreme heat, direct sunlight, and chemical attack. The dive computer cannot withstand the impact of heavy objects like scuba cylinders, nor chemicals like gasoline, cleaning solvents, aerosol sprays, adhesive agents, paint, acetone, alcohol etc. Chemical reactions with such agents will damage seals, case and nish. Store your dive computer in a dry place when you are not using it. The dive computer will display a battery symbol as a warning when the power gets too low. When this happens, the instrument should not be used until the battery has been replaced (see also section 3.1.1. Activation and Prechecks). Do not fasten the strap of your dive computer too tightly. You should be able to insert your nger between the strap and your wrist. Shorten the strap by cutting it, if you do not expect to need the extra length of it.

5.3. MAINTENANCE

The instrument should be soaked, thoroughly rinsed with fresh water, then dried with a soft towel after each dive. Make sure that all salt crystals and sand particles have been ushed out. Check the display and the transparent battery compartment cover for possible moisture or water. DO NOT use the dive computer, if you detect any moisture or water inside. In order to limit corrosion damage remove the battery and moisture from the battery compartment. Contact an authorized Suunto dealer for battery replacement or other needed service.

CAUTION!

Do not use compressed air to blow water off the unit. Do not use solvents or other cleaning uids that might cause damage. Do not test or use the dive computer in pressurized air.
5.4. WATER RESISTANCE INSPECTION
Water resistance of the unit must be checked after replacement of the battery or after other service operations. The check requires special equipment and training. You must frequently check the transparent battery compartment cover and the display for any sign of leaks. If you nd moisture inside your dive
computer, there is a leak. A leak must be corrected without delay, as moisture will seriously damage the unit, even beyond repair. SUUNTO does not take any responsibility for damage caused by moisture in the dive computer, if the instructions of this manual are not carefully followed. In case of a leak, immediately take the dive computer to an authorized SUUNTO dealer or distributor.

Check for any traces of ooding, particularly between the beeper and the lid, or for any other damage. In case of a leak or any other damage, bring the dive computer to an authorized SUUNTO dealer or distributor for check and repair.
Check the condition of the O-ring; a defective O-ring may indicate sealing or other problems. Dispose the old O-ring, even if it seems to be in good condition. Check that the battery compartment, battery holder and lid are clean. Clean with soft cloth if necessary.
10. Gently insert the new battery in the battery compartment. Check the polarity of the battery: the - mark should point toward the bottom of the compartment and the + mark upwards. 11. Reinstall the battery retainer in its correct position. 12. Check that the new lubricated O-ring is in good condition. Put it in the right position on the battery compartment. Be very careful not to get any dirt on the o-ring or its sealing surfaces. 13. Carefully press the lid onto the battery compartment with your thumb. It is better to press down the lid down one side rst, this minimizes entrapped air and it is thus easier to hold down the lid. Make sure that the O-ring is not at any point protruding out on the edge. 14. Put your other thumb through the locking ring. Press this thumb rmly against the lid and release the other one. Make sure that the lid is pressed completely down! 15. Turn the locking ring counterclockwise with your free thumb and ngers until it snaps into its locked position. 16. The dive computer should now active its timekeeping mode and show time 18:00 [6:00 PM] and date SA 01,01. Activate the instrument. Check that: All display segments work. The low battery warning is off. The buzzer beeps and backlight works. All the settings are correct. Reset if necessary.
17. Install the dive computer back into the console or boot and reassemble the strap. The instrument is now ready for use. Wrist model: Assembling into the boot: First insert the longer strap in its hole in the front of the boot and then the dive computer into its cavity in the boot starting at the back end. Then snap also the long strap end of the instrument into the boot. Stretch the boot as needed.
Assemble the shorter part of the strap. Use the spring bar tool or small screwdriver to compress the spring bars. Make sure that the spring bars get fully seated so they will not come off their holes. Ret the dive computer in the console according the instructions of the console.

DIY - PC - Interface for Suunto Cobra/Vyper/Vytec/Mosquito/D3
Summary This document is the distinct consequence of the Spyder/Stinger ACW interface DIY. After having many e-mails concerning the application for the above mentioned computers I finally decided to develop a prototype and then a small series of these interfaces. For the electronics the schematic from the ACW interface could be used. The mechanical concept needed a complete redesign. For the contacts in the plug I wanted to use the proven concept with spring-loaded contact probes because I got absolutely no complaints about the reliability of the data transfer, which is obviously a result of the outstanding performance of these contacts. For the rest of the mechanical design I wanted to have a concept that fits to all of the five computer models Cobra/Vyper/Vytec/Mosquito/D3. I think that the design described in this document can easily be rebuilt for people skilled in doing home mechanics and handicrafts in electronics. Note: The circuit described here has proven to be reliable and safe. A correct assembled device will never harm the dive computer nor the PC it is attached to. However I do not take any responsibility for any kind of damage. If you decide to rebuild this unit, its on your own risk.
PC-Interface Cobra/Vyper/Mosquito by Roli 2001/2002

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Circuit description
The circuit generally consists of two level shifters. The power is taken from the output signal lines DTR and TXD. One thing I have noticed a while ago is that the DTR line is forced high during the whole communication process. I decided to use this line for the positive supply. A second fact is that the output RXD has to be low only when the input TXD is low. So I decided to use the TXD line for the negative supply of the RXD level shifter. R1, R2, D1 and Q1 form a simple controlled current source. The current (about 120 microamps) produces a voltage drop of around 2.6 Volts across R3 when the TXD line is high. The voltage on R4 is limited by the B-E junction of Q2 to about 0.6 Volts. The sum corresponds to the logic-high level of -3.2 Volts for the D I/O contact of the dive computer. Q2, Q3, D3, R5 and R6 form a level shifter from the dive computer logic levels to RS232 levels. When the voltage drop across R3, R4 is more than about 1.5 Volts the RXD line is pulled high by Q2. With no voltage drop across R3, R4 and if the TXD is low the RXD line is pulled low by Q3. D3 is to protect the B-E junction of Q3 from being reverse biased and R5 serves to protect the circuit from damage due to shorting or miswiring RXD. A few words about D2 and D4: Sometimes, especially before the PC software takes control over the RS323 port and after terminating the communication the DTR line can be low. D2 is to protect the circuit (and also the dive computer) from this condition. D4 is to ensure a defined function of the RXD level shifter even when the TXD signal level is higher than the DTR level. Otherwise the C-B junction of Q3 gets forward biased and the RXD output is defined via Q3 instead of Q2. Remark: To achieve perfect function even with signal voltages down to 2.5V (below RS232 specs but often used on PDA's) simply replace all diodes (including D1) with BAT48 Shottky and use R2 = 6.2k and R6 = 10k. Then add a LM385-1.2 bandgap voltage reference IC in parallel to D1 (see the spare traces on the PCB layout).

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PCB Artwork
Layout and placement of the components (both top view) and in 2 : 1 scale. The size of the PCB shown here fits into the housing specified in the parts list. It should be no problem to reproduce the PCB since it is only single sided and the trace width as well as the spacings are comfortable. If you want to use the above layout for reproduction don't forget to shrink it by 50%. Carefully note the orientation of the transistors on the layout which may be unconventional for the TO92 package. The square pad is the pin # 1 (left when seen from the front).
Parts List (The remarks in brackets are for easier finding equivalents) Electronics: QBC546 (NPN, 100mA) Q2, QBC556 (PNP, 100mA) DBZX55C4V3 (zener 4.3V 0.5W) D2.D1N4148 (100mA silicon diode) R10k R27k R3, R4, R22k R1k all resistors > 0.25W Others: Cable Connector Contacts 1 4-core, 1-2 meters 1 DB9 female 2 Feinmetall part-# F620.115.120.N.075 Plug part 1 see below PCB 1 see above Housing 1 Conrad part-# 74 Rubber band 1

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The Plug The plug consists of a support part to hold the spring contact probes and the contact probes themselves. Refer to the drawing below for the dimensions of the support piece.

2.0 10.0

5.8 2.2 1.6 1.8

1.6 4.2 11.2

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The Assembly

The above picture shows the PCB placed inside the housing. The solder ends of the spring contact probes extending from the plug are glued into two holes in the housing with epoxy resin. The PCB is held inside the housing with another drop of epoxy resin. I use two screws with nuts to wrap the rubber band around. You can see the openings in the other end of the housing for the cable and for the rubber band.
This picture shows the arrangement of the contacts on the back of the dive computer. The example is for the Vyper but it's the same on Mosquito, D3 and Cobra, too.

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Test Its favorable to test the circuit before putting it into operation. All you need is a dual output adjustable power supply (two series connected 9V batteries do the job, either) and a voltmeter. 1) Set DTR and TXD to +9V referred to GND. The voltage across the dive computer contacts should become around 3V and the voltage at RXD should be around +8V to GND. 2) Change TXD to 9V (keep DTR at +9V). The voltage across the dive computer contacts should become zero and the voltage at RXD should be around 8V. Are these tests successful, you can plug the interface to the PC and see if the Dive Manager software recognizes it by the test routine. Now you can perform your first data transfer. Pictures
That's it. Inspire yourself with the pictures and improve the design even more. If you e-mail me pictures of your designs, I could add them to this documentation or put them on my web page.

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In Case of Problems First of all there are no known problems with the PC-interface or the Suunto software. In most of the cases the problem with the data transfer is due to dirt on the water sensor contacts, improper COM-port selection or the "COM time delay" value is not suitable for the hardware used. Here are some hints & tips: When you often get the Transfer Timed Out error message, try the following: 1. Make sure that you have your PC-interface properly connected to your PC following the instructions of the program and the Help utility. Run the TEST utility from the Transfer Menu - PC Interface Setup window which should recognize the COM-port to which the PC-interface is connected to. Now make sure that this COM-port is the one you have selected. 2. You can set the "COM time delay" in the Interface Setup window of the Dive Manager program. The value depends on the hardware used (is it a powerful PC or not, and some other PC settings). It is advisable to experiment with different values and see which one works the best. A value between 10 and 50 should be appropriate for 95% of all computers. 3. The water sensor contacts are sometimes contaminated with dirt or corrosion, which usually causes problems with the data transfer. Carefully clean the PC-interface pins and the watersensor contacts of your computer with a soft eraser or dry cloth. 4. Attach your interface plug to the dive computer when you are asked to do so by the Dive Manager software, then switch the dive computer to the TR-PC mode. According to the program's Help, you should set your computer in TR-PC mode before attaching the PCinterface. However some users have good experiences when setting the computer in PC-TR mode after the interface is attached. 5. If you had an unsuccessful transmission just leave and re-enter the TR-PC mode (without removing the interface from the computer) to try again. Remark: On some dive computer models 4. and 5. don't work because the computer enters the Dive mode (when it is not yet in TR-PC mode) as soon as the interface is attached. 6. Do not move or touch your dive computer and interface while transmitting because any movements may interrupt the transfer and you have to start all over again.

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