external display
FAI approved

ALTMR2 is an Altitude Motor Run Timer (AMRT) device designed specifically for F5J competition only and for nothing else.
There is no data logging of any other parameters except the requested ones. It is a pure competion device fulfilling the requirements of the SC4_Vol_EDIC_14.pdf document.
Approved by FAI CIAM AMRT006 approval document.
The firmware is factory upgradeable only (the end user cannot change or program anything at all).
Current firmware is F 2.0
The ALTMR2 is inserted between the ESC and the receiver's throttle channel output with polarized male and female connectors (possibility of damage due to forced reverse connection is anticipated by special circuit design).
It is designed for 4-6 V operation and RC systems using 1-2 ms pulses with a 20 ms frame. Recommended for use in environments of 0 to +50 degrees centigrade and 700-1100 mbar of atmospheric pressure.
It can handle both "BEC" and separate receiver’s battery setups. It must be noted that the ALTMR2 begins operation whenever it receives power for the first time regardless of the selected setup.
All information provided by the device are available by means of an external display which plugs into a standard 3 pin onboard RC connector. (possibility of reverse connection damage is anticipated by special design).The external display can be left connected (if required) for the duration of the flight.

Description of operation for a properly installed device with an external display attached .

1. Application of power (supplied either from the ESC or the receiver)
2. Calculation of base zero height reference during the initial five (5) seconds.
3. Display of Serial Number and firmware revision of the device for the initial 3 seconds.
4. Display of previously recorded STARTHEIGHT figure for at least the following 2 seconds and until MOTOR ON command is sensed or "CLEARED" and a series of dashes if the device was unpowered before obtaining a startheight figure during the previous recording session (unpowering the device before at least 10 seconds elapsed from the MOTOR ON command)
5. The device waits for a pulse exceeding 1.2 ms which is the MOTOR ON command. The display continues to show the previously recorded STARTHEIGHT figure retrieved from its non-volatile memory.
6. After such a command is sensed a 30 second timer is initialised and the recording / manipulation of pressure readings begin together with monitoring the throttle input for a MOTOR OFF command which is a pulse <= 1.2 ms. During this phase the receiver's throttle channel is still in control of the ESC.
The display shows a series of dashes and "CLEARED" and the previously recorder startheight is erased from the nonvolatile memory of the device
7. If either the 30 second timer overflows or the MOTOR OFF command is sensed (two consecutive pulses <= 1.2ms to be precise) the device starts another 10 seconds final timer and takes over (from the receiver) the ESC control issuing a 1.0 ms pulse which is the MOTOR STOP condition. This pulse is outputted until the device is unpowered. The display continues to display a series of dashes and "CLEARED".
8. After the 10 seconds timer overflows the display reverts to the "NEW" startheight screen showing the maximum height recorded from the start of the flight (1.2ms pulse detection) until the end of the 10 seconds final timer. It does this until the device is unpowered .In case the power is removed before these 10 seconds end then there is no recording of startheight and this is indicated on subsequent power on by dashes and "CLEARED".

Pressure range 700-1100 mbar
Temperature range 0 - 50 degrees centigrade
Systems using 1-2 ms pulses with a 20 ms frame.
Time 30+10 sec.
Motor On pulse >1.2 ms
Motor Off pulse <1.2 ms
ALTMR2 issued Motor Off pulse 1.0ms
Supply voltage 4-5.6 Vdc
Supply current 20 mA
Pecision of height measurement +/- 20cm
Weight 10 gr
Packed in heatshirk tubing
ALTMR2=42 Χ 24 X 6 mm
External Display=60 X 32 X 14 mm
















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