1. Cochran Consulting, Inc.
Lifeguard® Displays Tutorial 15 June 2015
Cochran Consulting, Inc.
“Not Just Another Dive Computer”
© 2015 Cochran Consulting, Inc.

2. Lifeguard® Displays Tutorial Features Common to All Display Modules
Lifeguard Display Modules are the means of the Lifeguard Family to show information to the diver. They are all wireless, hoseless, and very simple to operate and have no task loading. This is usually referred to as a “Lifeguard Display Module”.
The Display Module receives data transmitted from a Lifeguard CPU Module that have matching addresses and are within a one meter radius of each other. There are nine different CPU Modules each with its own display requirements. When the Display Module receives data from one of the nine CPU models, it automatically configures itself to display appropriate information. It is fully automatic with no task loading and no buttons. It even automatically turns itself on and off.
At this time there are three different models available:
“Lifeguard Display Module D1” for general individual diving use
“Lifeguard Display Module D3” for wired surface supplied system tender on the surface
“Lifeguard Display Module T1” for a dive supervisor with a dive team
Each Display Module is powered by one user replaceable off-the-shelf 3v Lithium battery that typically provides two years of reliable operation in normal use. It can be powered by two “N” cells, but at a substantial reduction in battery life. There are no rechargeable batteries to wear out, and no battery chargers to lose. The life can be substantially less depending on the Taclite usage factor. If the Taclite is turned on 100% of the dive time, it should last for 50 dive hours. The battery voltage is shown on the Primary screen on the bar-graph in the left and should be monitored. When the battery voltage is at or below 2.90 volts the WARNING legend will start flashing along with the screen that shows the battery voltage, and the Taclite will not turn on. When the voltage is at or below 2.80 volts, the Module will continue to function if in a dive but will turn off as soon as the current dive is completed, and it will not turn on again until a new battery is installed.
Each Display Module automatically turns on when it receives a data packet with the proper address. It can also be turned on manually by shorting contacts 1 and 2 with a metallic object such as a coin for two seconds. If the Module stops receiving packets and the contacts are not shorted, it automatically turns itself off after 30 minutes.
© 2015 Cochran Consulting, Inc.

3. Lifeguard® Displays Tutorial Features Common to All Display Modules
This Receiver-Display Module peripheral is typically worn on the divers wrist but is also available in hose-mount and retractor-mount configurations. The Model D1 (for OTS systems) and Model D3 (for Hytech systems) are also available in a Panel Mount for use with some Surface Supplied systems such as the Interspiro DP-1.
The “Lifeguard Display Modules” have an on-demand LED backlight (“Taclite”) with user selectable colors: Red, Orange, or Amber. The Taclite is turned on by tapping or bumping the case and it turns on for ten seconds. This “Taclite Dwell Time” can be changed by the user. The trans-flective display can be seen in even the brightest sunlight.
Depending on which one of the nine CPU Modules the Display Module is communicating with, there is one primary screen and one or two alternate screens. (To see what the various screens show refer to the User Manual or Tutorial for the specific CPU Module.) Tapping or bumping the Display Module case will sequence through the screens. If the Primary screen is currently showing, it will change to the first alternate screen showing more dive information. The Alternate screen will revert back to the Primary screen after four seconds. This time is called “Screen Dwell Time” and can be changed by the user.
Note: when case is tapped or bumped, the Taclite will turn on and the first Alternate Screen will be shown at the same time.
Display Module with all possible
Segments showing
© 2015 Cochran Consulting, Inc.

4. Lifeguard® Displays Tutorial Features Common to All Display Modules
When the Display Module turns on, the screen shown to the right
will appear. It indicates that it has passed all of its internal checks
and has sufficient battery power to start a dive. The display will
Start flashing after 10 seconds.
Do not start a dive if this screen is showing!
A typical normal Surface screen is shown to the right. The “SERVICE”
legend being on indicates that the Display Module configuration is
being updated to match the CPU Module. This usually takes less than
One minute.
Do not start a dive if the “SERVICE” legend is on!
A typical Surface screen with WARNING is shown to the right. The
“WARNING” legend means that some parameter(s) are out of range.
Do not start a dive if the “WARNING” legend is on! Determine the
Cause of the WARNING first.
© 2015 Cochran Consulting, Inc.

5. Lifeguard® Displays Tutorial Features Common to All Display Modules
© 2015 Cochran Consulting, Inc.

6. Lifeguard® Displays Tutorial Features Common to All Display Modules
Note that when the WARNING legend is on, the parameter(s) that is causing the Warning is also flashing. Sometimes the parameter(s) may be on an Alternate Screen in which event Tapping the unit will show that Alternate screen and the flashing parameter(s). Sometimes more than one parameter may be flashing.
The entire display flashing is an indicator that the Display Module is not communicating with its companion CPU Module. There are a number of reasons for this:
The companion CPU Module is not turned on;
The Display and CPU Modules don’t have the same address;
The Display and CPU Modules are out of range of each other.
Contact 3
Contact 2
Contact 1
There are a number of parameters in the Display Modules that can be changed by the user via Display Module Touch Programming:
Acquire TxRx ID Number D1, D3
Taclite Dwell Time D1, D3, T1
Display Module Touch Programming is a feature whereby the user can view or change certain parameters within a Display Module in the field without any software. It involves shorting contacts 1 & 2 or contacts 2 & 3 with a metal object. Display Module Touch Programming functions only when the unit is turned on and NOT in a dive. The CPU Module also has Touch Programming and is described in the CPU Module Tutorial and manual.
© 2015 Cochran Consulting, Inc.

7. Lifeguard® Displays Tutorial Features Common to All Display Modules
Short contacts 1 and 2 with a coin starts Display Module Touch Programming and sequences through all of the programming options as shown below. Touching contacts 1 and 2 with a damp finger selects the digit you want to change. The selected digit will flash. Touching contacts 2 and 3 with a coin or damp finger will increment the digit up to nine and then back to zero. Moving from the current Touch Programming option to the next by shorting contacts 1 and 2 automatically tells the Display Module to remember the new number until it is changed again. Leaving the Touch Programming function occurs automatically after the last function was selected. If left in the Touch Programming mode without touching anything, the unit will exit the mode after one minute.
First Touch Programming screen is the “Info” screen that shows the
Display Module Battery Voltage “3.05” with an implied decimal point.
Information shown on this screen cannot be changed.
The second Touch Programming screen is the “Acquire ID” screen that
allows the Display Module to capture the ID Number of the closest
CPU Module. For this function, the normal range (one meter) of the
system is reduced to 5 inches. The Display Module and its companion
CPU Module must be less than 5 inches from each other. Touching
contacts 1 and 2 with a damp finger takes you to the next screen where
a zero appears in the right bottom digit as shown in the next screen.
© 2015 Cochran Consulting, Inc.

8. Lifeguard® Displays Tutorial Features Common to All Display Modules
As the Display Module captures a packet the digit will increment to
four indicating it has captured four identical ID’s and will now
remember the ID until it is changed again.
The time (in seconds) the Taclight stays on after the case is tapped or
bumped is called the “Taclite Dwell Time”. The number must be
between 1 and 98. If the number is zero, the Taclite is disabled and
will not turn on. If the number is 99, the Taclite will stay on
permanently until you change it again.
If the battery voltage is too low (=< 2.90 volts) the Taclite will not turn
on and the audible warning will not sound. This is to preserve what
little battery life is remaining.
Note that battery life is inversely proportional to the amount of time the Taclite is on.
© 2015 Cochran Consulting, Inc.

9. Lifeguard® Displays Tutorial Features Common to All Display Modules
There are a number of parameters in the Display Modules that can changed by using its Touch Programming or the Analyst Version 5 PC software.
Enter TxRx ID Number Analyst Only D1, D3, T1
Acquire TxRx ID Number Touch Programming Only D1, D3
Load Diver List Analyst Only T1
Taclite Dwell Time Analyst & Touch Programming D1, D3, T1
Taclite Color Analyst Only D1, D3, T1
Screen Dwell Time Analyst Only D1, D3, T1
Display Deco Time Total/Stop Analyst Only D1, D3, T1
Display Ceiling * 10 Analyst Only D1, D3, T1
Fixed/Proportional Ascent Rate Analyst Only D1, D3, T1
Restore Config to Factory Default Analyst Only D1, D3, T1
When using the Cochran Analyst PC Software, only the “Analyst 5” which was released in 2015 is compatible with the Lifeguard and other products released after 1 January See the Analyst 5 Tutorial for further information.
© 2015 Cochran Consulting, Inc.

10. Lifeguard® Displays Tutorial LCD Receiver-Display Peripheral – D1
Model D1
Receiver and LCD Display
The Lifeguard Display Module D1 the wireless, hoseless means by which the CPU Module communicates with the diver. It is fully automatic with no task loading and no buttons. It even automatically turns itself on and off. It has an on-demand LED backlight (“Taclite”) with user selectable colors: Red, Orange, or Amber. The Taclite is turned on by tapping or bumping the case and turns on for ten seconds. This “On Time” can be changed by the user. The trans-flective display can be seen in even the brightest sunlight.
Lifeguard Display Module D1 must be one meter or less away from its companion CPU Module and have matching ID Numbers. Depending on which of the nine CPU Module models is being used, the D1 automatically assumes the personality of that specific module.
It is powered by one user replaceable battery that typically provides up to two years of reliable operation. There are no rechargeable batteries to wear out, and no battery chargers to lose.
© 2015 Cochran Consulting, Inc.

11. Lifeguard® Displays Tutorial LCD Receiver-Display Peripheral – D3
Model D3
Receiver and LCD Display
The “Lifeguard Display Module D3” is functionally identical to the “Lifeguard Display Module D1”. However, the D3 is intended to be used in Surface Supplied and/or Comm Rope wired tethered systems. It is the Surface Tender Display and has a connector on the side that is wired to the Comm cable. This D3 Module on the surface shows exactly the diver’s dive parameters when the diver is in a dive.
The D3 is primarily used with the Hytech wired communication system.
While this D3 Module is splash proof, it must not be taken beneath the water surface.
Contact Cochran for more details regarding Hytech, OTS, and other Surface Supplied and Tethered systems.
© 2015 Cochran Consulting, Inc.

12. Lifeguard® Displays Tutorial LCD Teams Receiver-Display Peripheral - T1
The Teams Receiver-Display peripheral allows one diver to monitor the dive parameters of a number of divers in a “Team”. There can be any number of divers in a “Team” and any number of “Teams” on a given Mission. There is no cross-talk between Teams or Team Members. It is typically worn on the divers wrist but is also available in hose-mount and retractor-mount configurations. This is usually referred to as the “Lifeguard Team Module T1”.
The Team Module receives data transmitted from any Lifeguard CPU Module that has matching addresses and are within a one meter radius of each other. This Team Display Module recognizes the nine CPU Module types it is communicating with and assumes its specific personality. Up to 64 unique addresses can be set into this Module so that it can recognize up to 64 Lifeguard CPU Modules.
The Module is fully automatic with no task loading and no buttons. It even automatically turns itself on and off. It has an on-demand LED backlight (“Taclite”) with user selectable colors: Red, Orange, or Amber. The Taclite is turned on by tapping or bumping the case and turns on for ten seconds. This “On Time” can be changed by the user. The trans-flective display can be seen in even the brightest sunlight.
It is powered by one user replaceable battery that typically provides up to two years of reliable operation. There are no rechargeable batteries to wear out, and no battery chargers to lose.
Model T1
Multi-diver Teams Receiver and LCD Display
© 2015 Cochran Consulting, Inc.

13. Lifeguard® Displays Tutorial Display Modules Battery
The Lifeguard Computer Displays D1 and D3 Modules and Team Module T1 are powered by one user-replaceable Lithium battery three volt Type CR12600SE.
With a fresh Lithium battery, the shelf-life of the Module is ten years. If diving, the battery life depends on the use of the backlight “Taclite”. If only occasionally using the Taclite, the batteries will last for over 1,000 hours of diving or two years, whichever occurs first. However, it is recommended to replace the batteries annually. If the Taclite is turned on for 100% of a dive, the battery life will be somewhat over 50 hours of diving. The Taclite turns on every time the case is tapped and the amount of time the Taclite stays on can be changed with the Analyst software or by using Touch Programming. From the factory, the Taclite Dwell Time is set for 10 seconds.
For maximum reliability and battery life it is recommend to use Lithium batteries. However, Alkaline “N” cells will also work but at substantially reduced life and reliability.
Battery voltage can be seen on the Lifeguard Display Module by using Touch Programming or the Analyst PC software.
Note: The Lithium battery is non-magnetic and will not affect a compass. Most Alkaline “N” cells are magnetic.
CAUTION: Never use the 12 volt battery that is similar in size to the 1.5 volt “N” Cell.
© 2015 Cochran Consulting, Inc.

14. Lifeguard® Displays Tutorial Replacing Display Modules Battery
The Lifeguard Computer Display and Team Modules battery is very easy for the user to replace as there are no chargers, wires, holders, or special tools needed. The battery has its own watertight compartment that is sealed from the electronics. The compartment is accessed by unscrewing its Cap with a coin (a US Quarter is supplied with the product). The Cap has two o-rings for watertight redundancy. The contacts in the Battery Caps and Compartments are of a unique metal that resists seawater corrosion. Should a compartment become flooded, immediately and thoroughly flush the compartment and cap with fresh water, let it dry, and replace the battery. Be sure to carefully inspect the Cap for debris before installing it. The Cap is a special material that is softer than the case material so that the Cap will be expelled should pressure build up within a compartment.
CAUTION: Observe proper polarity when installing battery! The positive tip goes in first.
Tighten battery cap until the o-rings cannot be seen.
Never overtighten the cap.
Only use the supplied U.S. Quarter or similar coin. Never use a screwdriver.
© 2015 Cochran Consulting, Inc.

15. Lifeguard® Displays Tutorial Display Module Warranty and Support
For Recreational use, the Cochran Lifeguard peripherals have a two year Limited Warranty. For Commercial and Military use it has a one year Limited Warranty. Download the Warranty details from our Website. All Models include USB interface and Standard Edition of the Analyst® PC Software.
We are committed to professional, responsive support for the lifetime of our products. Phone during our office hours in Dallas, Texas or Visit our Website for details.
The Cochran Lifeguard Products can be purchased from Cochran or carefully selected Distributors and Dealers.
© 2015 Cochran Consulting, Inc.

16. Lifeguard® Displays Tutorial © 2015 Cochran Consulting, Inc.
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© 2015 Cochran Consulting, Inc.