POSEIDON M28 User Manual
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POSEIDON M28 User Manual

Dive computer
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POSEIDON M28
USER MANUAL 2.1

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  • Page 1 POSEIDON M28 USER MANUAL 2.1...

  • Page 2: Table Of Contents

    Conventions Used in this Guide ................4 Preface .........................6 Conformance with CE Requirements ..............7 Chapter 1 – Overview Box content ........................ 8 An overview of the M28 ..................9 Button function ....................10 First start-up .......................11 Monitoring the Display ..................12 Top bar .......................13 Center area ......................14...
  • Page 3 System app - menu tree ..................39 Force fw update ....................40 Land app ......................42 Settings ......................43 Update SE7EN firmware through the M28 ............49 Chapter 3 – M28 Alarms Alarm signals ......................51 Abort and open circuit alerts, DO NOT DIVE alert ............. 52 General alert, Stop alert ....................
  • Page 4 POSEIDON M28 USER MANUAL Chapter 5 - Recharge the M28 battery Changer cable ....................70 Chapter 6 - Bungee cord, Care and maintenance Bungee cord preparation ..................71 Care and maintenance ..................72 Chapter 7 - Protective Cover & Screen Protection Protective Cover and Screen Protection ...............73 Chapter 8 - Technical specifications Dimensions and weight ..................75...

  • Page 5: Conventions Used In This Guide

    This User Guide is NOT intended for use as a training manual, or in any way as a substitute for proper training through a legitimate training agency approved by Poseidon AB. It is only intended to provide basic information concerning the Poseidon M28.Throughout this Guide, special alert boxes have been inserted to draw attention to critical information.
  • Page 6 Poseidon Diving Systems AB. Text, photographs and figures copyright © 2022 by Poseidon Diving Systems AB ALL RIGHTS RESERVED Manual Version 2.1 - February 2022...

  • Page 7: Preface

    • Highly intuitive user interface with dual button control • Enhanced SE7EN with the M28’s Rebreather Management System • Dive-by-Wire™ integration with Poseidon Pod Systems, HUD, HP and other sensors • Dual decompression algorithm (DCAP and Bühlmann ZHL16C with gradient factors) •...

  • Page 8: Conformance With Ce Requirements

    This device may not cause harmful interference, and this device must accept any interference received, including interference that may cause undesired operation. This product has been tested to comply with FCC standards. Poseidon Diving Systems AB is certified according to ISO 9001...

  • Page 9: Chapter 1 Overview

    POSEIDON M28 USER MANUAL Chapter 1 Overview This chapter describes the steps to assemble and prepare the Poseidon M28 for diving. The M28 is a modular device with subsystems. Box content: • M28 computer • Travel pouch • Storage case •...

  • Page 10: An Overview Of The M28

    USER MANUAL An overview of the M28 The figure illustrates these locations and the main features of the Poseidon M28. The “back” of the M28 is the side opposite to the display side. Following is a brief description of each of the major components.

  • Page 11: Button Function

    USER MANUAL Button function Once the M28 is fully powered up, it is ready to use. To operate and access functions, use the two buttons. The interface is very intuitive to use and is described in the figure below. Press both buttons simultaneously to enter the menu system, then scroll up or down and press both buttons simultaneously again to select the highlighted option.

  • Page 12: First Start-Up

    To start the M28 press both buttons simultaneously Once the M28 has been started, the indicator light will flash green to indicate that the M28 computer is turning on. This will be followed by a start-up screen with a visible Poseidon logo.

  • Page 13: Monitoring The Display

    It is extremely important that all Poseidon M28 divers understand how to read the information contained in the Display, particularly concerning various alarm condi- tions. Before even turning the Poseidon M28 on, it is useful to understand the general layout of the Display, and the logic behind how the information is organized.

  • Page 14: Top Bar

    POSEIDON M28 USER MANUAL Top bar The top bar is visible in all apps and indicates the selected app, connecting status, clock and status of the battery. Connection status Clock or current dive mode...

  • Page 15: Center Area

    USER MANUAL Center area The M28 gives the diver the option to select what information that shall be displayed in the center area. You can cycle through the available center area content using the up or down key. The available content options varies with the selected App and Dive mode.
  • Page 16 POSEIDON M28 USER MANUAL Clock. Displays the same time and time zone as the Top Bar. Adjustments of the clock´s time are made in settings. gauge. Shows one or more pp NEEDLES depending on the number of oxygen sensors connected. Long white needle for the main sensor, gray tip for secondary sensor, blue tip for the third sensor.
  • Page 17 POSEIDON M28 USER MANUAL Compass and Gyro. Displays compass heading and Gyro attitude. The compass is tilt independant. This symbol appears when the compass is not calibrated. Calibrate by rotating the computer slowly in all directions illustrated by the figures below until the symbol disappears.
  • Page 18 POSEIDON M28 USER MANUAL Setpoint which are used by SE7EN and the M28 to determine the sliding setpoint at the current depth. Setpoint low and Setpoint high can be reconfigured from the Dive app menu in SE7EN, CPOD and Setpoint dive mode.
  • Page 19 If a SE7EN is connected, the M28 also displays the SE7EN battery status. The battery icon in the Top Bar always shows the battery status for the M28. Temperature. Displays the current water temperature when you dive.

  • Page 20: Chapter 2 The Menu System

    USER MANUAL Chapter 2 The menu system Most of the features and functionality of the M28 are accessed through the menu system. To activate the menu system, simply press both buttons simultaneously. The menu now becomes visible, the top three menu items are always the same, starting with “Exit menu”...

  • Page 21: Dive App

    POSEIDON M28 USER MANUAL Dive app This section explains the various areas and symbols shown in the display when the Dive app is selected. This page explains the display content in the various modes except the GAUGE mode which will be explained last in the dive view chapter.
  • Page 22 POSEIDON M28 USER MANUAL Battery status for the M28 battery. Battery status can be displayed in the Center area for multiple devices simultaneously.

  • Page 23: Text Message Box

    ) to be breathable. There is also an alarm if the ppO is too high to breathe. This type of message is displayed when the M28 detects that connection to a device is lost, see Connection status alarms for more information.
  • Page 24 FW missmatch SE7EN The firmware in the connected unit is not matching the version used in the M28 unit. Update the firmware from the M28 by selecting the menu “Firmware update” located in the end of the dive menu list.
  • Page 25 POSEIDON M28 USER MANUAL When the user has selected to update firmware this screen will appear and inform of the firmware update progress status. Wait until is is completed.

  • Page 26: Open Circuit (Oc) Mode Menu

    USER MANUAL OPEN CIRCUIT (OC) MODE MENU The M28 computer contains a powerful Open Circuit dive mode that handles decompression and multiple gases. To select the OC mode, press both buttons to enter the menu system. Select Apps and then further Dive.

  • Page 27: Open Circuit (Oc) Mode After Dive Start

    POSEIDON M28 USER MANUAL OPEN CIRCUIT (OC) MODE AFTER DIVE START Current view symbol After “Dive start”, Current view symbol flashes to indicate the active dive as long as it is in progress. The menus that are relevant for the current dive mode are shown after “Dive Start”.
  • Page 28 DECOMPRESSION MODEL SELECTION As previously mentioned the M28 computer is equipped with two different decompression algorithms; DCAP and Bühlmann ZHL16C. To select the algorithm to use, enter the Dive config menu and select Deco. Once in the Deco menu you can either select DCAP or Bühlmann.

  • Page 29: Setpoint And Cpod Closed Circuit (Cc) Mode Menu

    POSEIDON M28 USER MANUAL SETPOINT AND CPOD MODE In Setpoint mode the M28 will assume that the diver breathes a gas mix with a equal to the setpoint at the current depth and use that as input to the decompression model.

  • Page 30: Setpoint And Cpod Closed Circuit (Cc) Mode Menu After Dive Start

    POSEIDON M28 USER MANUAL SETPOINT AND CPOD MODE AFTER DIVE START Current view symbol After “Dive start”, The Current view symbol flashes to indicate the active dive as long as it is in progress. After “Dive Start” the menu will only contain content relevant to the current dive mode during dive.
  • Page 31 POSEIDON M28 USER MANUAL named Oxygen-1 and Gas-1 to Gas-8. Each of the gas configurations can be individually setup in terms of FO2, FHe (not applicable for Oxygen-1), cylinder volume, maximum cylinder pressure and the ppO limit used to determine MOD (not applicable for Oxygen-1).

  • Page 32: Se7En Closed Circuit (Cc) Mode Menu

    POSEIDON M28 USER MANUAL SE7EN MODE MENU Please refer to the comprehensive Appendix 3 of the SE7EN Manual. The figure below shows the menu system related to the M28 SE7EN mode. Only available when SE7EN is connected.

  • Page 33: Se7En Closed Circuit (Cc) Mode After Dive Start

    POSEIDON M28 USER MANUAL SE7EN CLOSED CIRCUIT (CC) MODE AFTER DIVE START Current view symbol After “Dive start”, Current view symbol flashes to indicate the active dive as long as it is in progress. After “Dive Start” shows the menus that are relevant for the current dive mode.

  • Page 34: Gauge Mode

    POSEIDON M28 USER MANUAL GAUGE MODE The Gauge mode will give the diver depth and time information, similar to a bottom timer. The stopwatch functionality is identical to Land mode. NOTE! The decompression algorithm is disabled in this mode. Alarm area...

  • Page 35: Dive Log App

    POSEIDON M28 USER MANUAL Dive log app The M28 contains a log viewer where you can look at your recent dives. Each log has an index number, dive time and max depth displayed below the plotted curves. Use the buttons on the M28 to change between the stored dive log.

  • Page 36: Planner App

    (repeated) dive at the dive site. The Planner uses your current decompression status (tissue tensions) registered in the M28 together with your current settings, enabled gases in your gas configuration and the current barometric pressure. RMV (Respiratory Minute Volume) is synchronized from SE7EN when SE7EN is connected to the M28.
  • Page 37 POSEIDON M28 USER MANUAL your dive profile and present it visually together with a list of depth and time for each decompression stop, plus the calculated gas usage. Scroll down to see the Deco list and the calculated gas usage.

  • Page 38: Picture App

    The M28 includes a picture app that allows you to view stored pictures and other information. You can upload or remove pictures from a personal computer or mobile phone via the web interface when M28 is connected by Wi-Fi. Press up or down button to view the next or previous picture.

  • Page 39: System App

    POSEIDON M28 USER MANUAL System app The System app provides useful information concerning the M28 computer and connected devices, if any. The information available in the System app might be necessary to provide when reporting problems to Poseidon’s customer support.

  • Page 40: System App - Menu Tree

    The figure below illustrates the menu tree underneath the “System” app. The various functions in the menu allow you to force update of firmware in other connected Poseidon products and edit registers in connected units. This option is only available...

  • Page 41: Force Fw Update

    The device will therefore not be detected by the M28 and the firmware update for that device will not be available in the menu. Forced fw update is only intended to resolve this or similar situations.
  • Page 42 Select this option if you want to update the firmware in the SE7EN Paddle DISPLAY (Black/white LCD type). Select this option if you want to update the firmware in the M28 charger cable. Please note that the charger cable needs to be connected to a USB power source when performing the update.

  • Page 43: Land App

    POSEIDON M28 USER MANUAL Land app The Land app gives information valuable to the diver after or prior to the dive. Most of the visible content of the land mode is static but the center icon and stop watch can be used. To change the center view, press the up or down button to cycle between the clock and the two compass views.

  • Page 44: Settings

    These options are not available in dive mode The power menu allows you to turn off the M28 or reboot the M28. If the unit does not power off after a 1 minute, it is also possible to enforce a power off by...
  • Page 45 The connect menu is used to connect to external sources such as external sensors, HUD, CPODs and others. When you connect the M28 to an external sensor or any other device that lacks its own power supply, you need to activate the power output from the M28 to provide power to such a device.
  • Page 46 (when not connected to a charger). In case of inactivity, the M28 powers down after the set time to save power. Range 0, 5 .. 60 min where 0 min equals to OFF.
  • Page 47 The screen will not dim during pre-dive-test view. When the screen has been dimmed, the next button press will restore the screen brightness, but will not otherwise affect the M28. The backlight level that the screen will dim to when the timeout value has expired.
  • Page 48 POSEIDON M28 USER MANUAL Set date/time in local time. Be sure to correctly set the time zone before setting this to the local time. Select the layout of the device and flip the screen 180 degrees for maximum usability. This will help the user select left- or right-handed usage.
  • Page 49 Clear tissue values resets the decompression model data. DANGER: Resetting tissues on your M28 computer could lead to severe injury or death if not done with an understanding of its consequences. This action should not be taken without the approval or recommendation...

  • Page 50: Update Se7En Firmware Through The M28

    SE7EN in many ways. One of the features within the M28 makes it possible to update the firmware of the SE7EN from the M28. This might be a handy tool if you have to field replace a part of the SE7EN and experience inconsistent firmware versions within the SE7EN.
  • Page 51 The M28 is fully charged once the battery icon shows the state of charge as 100% and the battery icon turns white.

  • Page 52: Chapter 3 M28 Alarms

    Chapter 3 M28 Alarms Alarm signals The M28 uses alarm icons to indicate active alarms and to guide the diver in what actions to take. The M28 flashes on-screen numbers related to the active alarms, such as depth or ppO .

  • Page 53: Abort And Open Circuit Alerts, Do Not Dive Alert

    POSEIDON M28 USER MANUAL Abort and open circuit alerts The most important alert symbols on the screen are also the largest: The ABORT and Open-Circuit symbols. Whenever this is displayed, the dive should be immediately terminated. There are two possible abort scenarios, either OC or CC.

  • Page 54: General Alert, Stop Alert

    POSEIDON M28 USER MANUAL General alert The General alert symbol located in the Alarm Signal Area will flash in synchrony with any other parameter(s) on the screen that is/are inappropriate or out of acceptable range. This signal is intended to catch the diver’s attention, and prompt the diver to scan the other elements on the screen to see which value(s) is/are also flashing.

  • Page 55: Electronics Alert, Alarm Message

    POSEIDON M28 USER MANUAL Electronics alert The Electronics alert symbol indicates that a problem has been detected with the electronics, such as a cable failure or electronics failure in one of the CAN units. The specific cause is recorded in the logged data. If the Electronics alert symbol is shown, ABORT the dive or DO NOT DIVE.

  • Page 56: Decompression Ceiling Alert

    POSEIDON M28 USER MANUAL Some of the alarms in the M28 will display a message (in English) when activated. The alarms that display messages are: • OC ppO low / high / high (immediate) • Display disconnected / reconnected • SE7EN disconnected / reconnected •...

  • Page 57: Descend Arrow

    POSEIDON M28 USER MANUAL Descend arrow In the unlikely event that a diver incurs a decompression obligation (i.e., the Decompression Ceiling Alert is displayed), and the diver then ascends above the depth at which the Decompression Stop Alert is displayed, the Descend arrow will flash.
  • Page 58 HUD. The latter case would arise if the HUD was unable to communicate reliably with the M28 or report that the mouthpiece is in both open and closed position at the same time. In any case, if the...

  • Page 59: Dive Alarms

    USER MANUAL Dive alarms Dive alarms is the group of alarms that relate to use of the M28, in other words diving. The alarm conditions are however monitored even if no dive is in progress. The table below lists the dive alarms of the M28 together with their activation and deactivation conditions.
  • Page 60 Invalid mouthpiece The mouthpiece is neither in The mouthpiece position is position OC nor CC position in either CC or OC position Only applicable in CPOD and Setpoint dive mode when a HUD is connected to the M28.

  • Page 61: Connection Status Alarms

    As soon as the M28 detects the SE7EN E-module or other devices on the CAN-bus, such as the HUD or a CPOD, the M28 will begin to monitor their presence. If contact with a device is lost a disconnection alarm is triggered and the vibrator and applicable alarm icons are activated together with an on-screen message telling which device that has been disconnected.
  • Page 62 POSEIDON M28 USER MANUAL disconnection message and the alarm icons requesting actions are deactivated. A flashing Electronics alert icon will however remain active to remind you that a disconnection problem still exists. Disconnection alarms can be reset when not diving. Resetting a disconnection alarm will deactivate the message together with all related alarm signals.

  • Page 63: Technical Alarms

    USER MANUAL Technical alarms In addition to the Dive alarms and Connection status alarms, there are also several technical alarms which the M28 can activate if it detects a technical failure. Examples are pressure sensor failure, missing ppO sensor, internal communication errors and firmware mismatch.

  • Page 64: Chapter 4 Wi-Fi Access Point

    USER MANUAL Chapter 4 Wi-Fi Access Point HOME To connect the M28, enable Wi-Fi on the M28 and connect to a PC/Mac or other device. • Wi-Fi name: M28-xxx (where xxx is the number of the device) • Password: matterhorn...

  • Page 65: Dive Log

    USER MANUAL DIVE LOG When the M28 is connected to a PC/Mac or other device through Wi-Fi, it is possible to download dive log files. The dive log files are encrypted and can be read with the latest release of RbConfig. Simply go to the Dive Log tab and download the desired logs to your local PC/Mac.

  • Page 66: Redbox Log

    POSEIDON M28 USER MANUAL REDBOX LOG Just like the dive log the redbox log contains dive data but also more detailed data that logs all events from when the unit is turned on until it’s turned off. The main purpose of this data is for customer support, quality and contains...

  • Page 67: Picture

    PICTURE n the picture tab it’s to manage the pictures you want to store on your M28. Simply browse and upload images or delete unwanted images by pressing the delete button. Please note that a deleted picture will be lost and cannot be recovered or undeleted.

  • Page 68: Screen Dump

    USER MANUAL SCREEN DUMP It is sometimes useful to capture an image of the M28 (e.g., to provide to Poseidon technical support). When the M28 is connected to a PC/Mac or other device through the Wi-Fi, select the “Screen Dump” option.

  • Page 69: Firmware Update

    Then press the “Upload firmware file” button to load the new firmware onto the M28. When the new firmware is loaded, you need to reboot the M28 to install it. This can be done through the “System” menu item in the browser,...

  • Page 70: System

    POSEIDON M28 USER MANUAL SYSTEM The system option allows you to power off or reboot the M28.

  • Page 71: Chapter 5 Recharge The M28 Battery

    The M28 charger cable has a standard USB connector on one end, and a custom submarine connector for the M28 on the other. To charge the M28, simply remove the cable connector plug, insert the connector from the charger cable, and hand tighten the nut.

  • Page 72: Chapter 6 Bungee Cord, Care And Maintenance

    POSEIDON M28 USER MANUAL Chapter 6 Bungee cord, Care and maintenance Bungee cord preparation Example of how the bungee cord can be attached.

  • Page 73: Care And Maintenance

    Bottom button Spring 3x12 mm Screw M2x3 Ensure that the compression spring is correctly re-installed. Hand tighten the screws carefully. The buttons are automatically recalibrated by the M28. Buttons, springs, and screws are available to be ordered as spare parts.

  • Page 74: Protective Cover And Screen Protection

    Leaving the M28 for long periods of time without recharging will lead to premature battery aging. If the M28 is not used during a longer time period, the best storage method is to recharge the M28 once a month. If this is not possible, the best long-term solution is to leave the M28 plugged into the charger.

  • Page 75: Chapter 7 Protective Cover & Screen Protection

    POSEIDON M28 USER MANUAL Chapter 7 Protective Cover & Screen Protection (accessories, not included with M28) Protective Cover, black or red. Screen Protection.

  • Page 76: Chapter 8 Technical Specifications

    POSEIDON M28 USER MANUAL Chapter 8 Technical specifications Dimensions and weight. 29 (1,15”) 101 (4”) 75 (2,95”) Weight: 2 60 gr (0,57 lb)

  • Page 77: Operating Conditions, Depth Gauge

    Accuracy: ± 1% of full scale or better from 0 to 200 m / 656 ft at 20°C / 68°F (complying with EN 13319) Depth display range: 0 to 300 m / 984 ft International design registration (WIPO) DM/093447 for design of computer M28, CPOD and graphic interface.

  • Page 78: Appendix 1 Symbols

    POSEIDON M28 USER MANUAL Appendix 1 Symbols Alarm and Warning symbols DO NOT DIVE No Circuit mode General alert Mouthpiece position Unknown Stop ascending Question Electronics alert Attention Abort Compass calibration Celling alert Compass Magnetism Warning Ascend indicator Open Circuit...

  • Page 79: Display States And Views, Connecting Symbols

    POSEIDON M28 USER MANUAL Display states and views Connecting symbols Land view Wifi Dive view CAN connected Dive log CAN connected, power input CAN connected, power output Picture Planner System Settings Battery status Level Level low Charging...

  • Page 80: Appendix 2

    POSEIDON M28 USER MANUAL Appendix 2 Rebreather connectivity examples Standard recreational setup Recreational setup (SE7EN + M28) (SE7EN + CPOD + M28) Standard technical setup Setup for loop ppO monitoring (SE7EN + Primary M28, on any rebreather CPOD + Secondary M28)

  • Page 81: Support And Feedback Page

    POSEIDON M28 USER MANUAL Support and Feedback page If you need support or have feedback with any suggestions regarding functions, display views etc. Please email them to support@poseidon.com...
  • Page 82 Poseidon Diving Systems AB Åkeredsvägen 1, SE-421 63 Västra Frölunda, Sweden Phone: +46 31 734 29 00 E-mail: info@poseidon.com www.poseidon.com...

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