Javad MINTER User manual

MINTER
User's Manual
Revision May 31, 1999

USER'S NOTICE
Specifications are subject to change without notice. JPS provides this manual "as is”
without warranty of any kind, either express or implied, including but not limited to the
implied warranties or conditions of merchantability or fitness for a particular purpose.
For updated manuals and software, or product release information you may visit JPS
WWW site at http://www.javad.com or contact JPS Customer Support by e-mail
[email protected].
© Copyright 1998 Javad Positioning Systems. All rights reserved.

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Table of Contents
GENERAL DESCRIPTION..............................................................................................4
PWR KEY AND STAT LED.............................................................................................4
FN KEY AND REC LED..................................................................................................5
HOW TO CLEAR NVRAM...............................................................................................5
CHANGE SERIAL A SPEED TO 9600 ...........................................................................5
EXTENDED INFORMATION (EI) MODE ........................................................................5
INTERNAL MODEM OPERATION STATUS ..................................................................6

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General Description
MINTER (MINimum INTERface) is a simple user interface
that consists of two keys and two LEDs, which can control
and display the operation of the receiver.
MINTER brings a new level of automation to the GPS field
operation. Its function is similar to what is available on
advanced photo cameras, where the camera takes several light and distance
measurements, adjusts all the settings of the camera, and conveys the ready status of
the camera (by a green light) for the photographer to push the button.
Behind the simple appearance of MINTER, there are sophisticated algorithms and tests
that ensure reliable data collection and recording.
MINTER performs the following functions:
•Turns the receiver On or Off, or put it in the Sleep mode. When in Sleep mode, the
receiver will turn on in response to any activity on the RS232 port.
•Turns data recording On or Off.
•Shows the number of GPS and GLONASS satellites that are being tracked.
•Shows data recording status.
•Shows each time data is recorded to internal memory.
MINTER has one Satus (STAT) LED and one Recording (REC) LED. Each LED has
three colors: red, green, and yellow.
MINTER has an ON/OFF key (PWR) and a function key (FN).
MINTER also has protection against stuck keys (e.g. when a key is held down
unintentionally for a long time by other objects in a backpack.)
PWR Key and STAT LED
To turn on the receiver,push the PWR key and release it. To turn it off, press the PWR
key for more than 1 and less then 4 seconds, during this period the STAT LED remains
off to assist you.
To put the receiver into Sleep Mode,press the PWR key for more than 4 and less than
8 seconds;during this period the STAT LED is yellow. While in Sleep Mode, any activity
on an RS-232 port will turn the receiver on.
If you press the PWR button for more than 8 seconds, it will be ignored. This is done to
protect the receiver operation against stuck keys. When the receiver is ON and no
satellites are tracked, the STAT LED is red. Instead, this LED will blink as follows:
1. Green for each GPS satellite being tracked;
2. Pause, if at least one satellite has the energy potential more than 48 db*Hz, red
blink instead;
3. Yellow for each GLONASS satellite being tracked;
4. Pause, if the receiver can estimate its nav. position, red blink if it can’t.
For example, if 8 GPS and 5 GLONASS satellites are being tracked, the STAT LED
repeatedly blinks 8 greens and 5 yellows between successive pauses or reds.
STAT
PWR
FN
REC

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FN Key and REC LED
The Function key (FN) starts and stops data recording. Holding the FN key for more
than 1 and less than 8 seconds will start/stop data recording. The status of data
recording is shown by the REC LED. Data recording is on when REC LED is green;
data recording is off when this LED is off. If REC LED is red, it indicates a hardware
problem with data recording (e.g. memory is full).
The green light of REC LED blinks each time the data is written to the internal file. The
data recording time interval is what has been programmed in the receiver (by a hand-
held interface device or a computer).
Holding the FN key for less than 1 ('click') either switches between different information
modes (normal, extended information, internal modem status), or between static and
dynamic post-processing modes, depending on the receiver' configuration.
Holding the FN key for more than 8 seconds has no impact.
Each time data recording is turned off and on a new file is opened and automatically
named by the receiver (using date and time).
After turning the receiver on, loading a new firmware, or clearing the receiver NVRAM,
receiver checks its internal file system. During this operation, the REC LED flashes
yellow, and the file system is not accessible for CDU applications or for data recording.
This operation may require from fractions of a second to several seconds, depending
on the reason it started and the amount of the internal memory.
How to Clear NVRAM
It is possible to clear NVRAM using only MINTER. To do that:
1. Turn the receiver OFF.
2. Press and hold FN button.
3. Press and release PWR button to turn the receiver ON.
4. Wait until both LEDs will light green.
5. Wait around five seconds, until both LEDs will blink yellow.
6. Release FN button.
Note that LEDs will blink yellow only during next five seconds, and to clear NVRAM it is
essential to release FN button when they blink yellow.
Change Serial A Speed to 9600
MINTER has an option to turn baud rate of serial port A to 9600. To do that, press FN
button and hold until REC LED becomes red (about 5 seconds), then release FN button
while REC LED is red (during next 3 seconds).
Extended Information (EI) Mode
In this mode the receiver continues work as usual, but the STAT LED indicates
extended information, useful for test purpose.
To switch to EI mode click either FN or PWR button on MINTER. 'Click' means push
and quickly release (inside one second). To switch back to normal blinking click either
button once again (two times, if an internal modem is present).

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In the EI mode receiver blinks 5 times per cycle. The first blink is a delimiter. It is easily
distinguishable double-blink. Other 4 blinks stay for position computation, SN ratio,
oscillator frequency offset and continuous tracking tests respectively. Each blink could
be yellow, red or green. Yellow means that information for test isn't available. Green
means test is passed. Red means test is failed. The delimiter double-blink also could
be one of these colors. Its color is calculated from colors of other blinks. It is yellow if at
least one of blinks is yellow. It is red if no other blinks are yellow and there is at least
one red blink. It is green in all other cases.
The simple interpretation of testing requires only delimiter double-blink color to be
watched for. If it is green — all is OK, if it is yellow — need to wait more, if it is red —
some tests failed.
With good receiver, antenna and observation conditions, all blinks should be green in
10 minutes after power on.
Thresholds are:
•51 db*Hz for SN ratio (red if less for all locked satellites),
•3 ppm for frequency offset (red if more),
•15 minutes for continuous tracking time.
Internal Modem Operation Status
This information mode is available only if the receiver is equipped with an internal
modem.
To switch to mode,click either FN or PWR button on MINTER two times (one, if already
in EI mode). 'Click' means push and quickly release (inside one second). To switch
back to normal blinking click either button once again.
1. When modem is turned off, the STAT LED blinks short red 2 times per second.
2. When modem is turned on, but no data is transmitted/received, LED blinks long red
2 times per second.
3. When modem sends data, LED blinks long yellow two times per second.
4. When modem receives data, LED blinks long green two times per second.