Javad MinPad User manual
MinPad
User’s Manual
©Copyright Javad Navigation Systems, Inc.
March, 2006
All contents in this document are copyrighted by JNS. All rights reserved.
The information contained herein may not be used, accessed, copied,
stored, displayed, sold, modified, published, or distributed, or otherwise
reproduced without express written consent from JNS.
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TABLE OF CONTENTS
Chapter 1. Introduction
MinPad Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
MinPad’s LEDs and Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Chapter 2. Keys and LEDs
PWR Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Reset Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
STAT LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
FN Key and REC LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Information Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Normal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Extended Information Mode (EIM) . . . . . . . . . . . . . . . . . . . 2-6
NVRAM clearing with MinPad . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
RX LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
L-Band/Beacon Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
JNS 2W UHF 410-470 MHz radio transceiver . . . . . . . . . 2-10
PDL Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Single GSM/GPRS radio modem . . . . . . . . . . . . . . . . . . . 2-10
JNS 1W UHF902-928 MHz radio transceiver . . . . . . . . . 2-10
LED Indicator for JNS Tri-Band Receiver . . . . . . . . . . . . 2-11
Battery LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
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INTRODUCTION 1
MinPad (Figure 1-1) is a simple user interface that consists of two keys and two
LEDs, which can control and display the operation of the receiver.
Figure 1-1. MinPad
MinPad 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 MinPad, there are sophisticated algorithms and
tests that ensure reliable data collection and recording.
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1INTRODUCTION
MinPad Functions
MinPad Functions
MinPad 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.
MinPad’s LEDs and Keys
As usually MinPad has the following LEDs:
• one Status (STAT) LED and
• one Recording (REC) LED.
Notice:
In the systems with more than one board (e.g. JNSGyro-2
and JNSGyro-4) there are more than one STAT and one
REC LEDs.
Each LED has three colors: red, green, and orange.
MinPad as usually has the following keys:
• an ON/OFF key (PWR)
• Function/recording key (FN).
• Reset key
• Receivers equipped with internal batteries, (Figure 1-2) have in addition the
battery (BATT) LED.
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INTRODUCTION
MinPad’s LEDs and Keys
• Receivers equipped with communication board (Figure 1-2) have also the
communication board status (RX) LED.
Figure 1-2. Maxor’s MinPad
In addition, MinPad has protection against stuck keys (e.g. when a key is held
down unintentionally for a long time by other objects in a backpack).
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KEYS AND LEDS2
This chapter provides an overview of the MinPad’s keys and LEDs. This
information is split into the following sections:
PWR Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Reset Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
STAT LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
FN Key and REC LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Information Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
NVRAM clearing with MinPad . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
RX LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Battery LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
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2KEYS AND LEDS
PWR Key
PWR Key
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 orange. 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.
Reset Key
Pressing the reset key for about one second causes:
• a hard reset of the receiver.
• the receiver to leave Zero Power Mode and return to Normal Mode.
Notice:
Only use this procedure if the receiver does not respond
to commands or does not charge the internal batteries (is
in Zero Power Mode).
STAT LED
When the receiver is ON and no satellites are tracked, the STAT LED is red.
Instead, this LED blinks as follows:
•Green for each GPS satellite being tracked;
• Pause, if at least one satellite has the energy potential more than 48 db*Hz,
red blink instead;
•Orange for each GLONASS satellite being tracked;
• Pause, if the receiver can estimate its navigation 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 oranges between successive pauses or
reds.
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KEYS AND LEDS
FN Key and REC LED
FN Key and REC LED
Table 2-1 summarizes FN key functions and REC LED statuses. See PCView
Software Manual for information on setting FN key modes.
• Pressing the FN key for less than one second switches the receiver between
different information modes (normal and extended information), or between
static and dynamic post-processing modes, depending on the receiver's
configuration.
During the first second of pressing the FN key, the REC LED is orange.
• Pressing the FN key for more than one and less than five seconds will start/
stop data recording.
During data recording the REC LED is green or orange.
If the REC LED is red, the receiver has run out of memory, has a hardware
problem, or contains an improper OAF.
• The REC LED blinks green or orange each time data is written to the
internal receiver's memory.
You set the data recording time interval using PCView. See PCView
Software Manual for information on setting this function.
Each time you turn off or on data recording, either a new file opens or data
appends to a particular file.
• Pressing the FN key for more than five and less than eight seconds will turn
the baud rate of serial port A to 9600. After about five seconds of pressing
the FN key, the REC LED becomes red. Release the FN key while the REC
LED is red (during the next three seconds).
Pressing the FN key for more than eight seconds has no impact.
• After loading new firmware or clearing the receiver's NVRAM, the receiver
checks its internal file system.
During this operation, the REC LED flashes orange, and the file system is
not accessible for CDU (control display unit) applications or for data
recording. This operation may require from fractions of a second to several
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2KEYS AND LEDS
FN Key and REC LED
minutes, depending on the circumstances and the amount of internal
memory.
Table 2-1. FN Key Functions and REC LED Status
FN Key REC LED Status
When data recording is OFF, and the FN key is...
Not pressed
No light No data recording.
Orange blink Internal file system test in progress.
Red No free memory; hardware problem with
data recording.
Pressed for < 1 second
If FN key mode is «LED blink mode switch»
Orange Release to charge information mode.
If FN key mode is «Occupation mode switch»
Orange No function.
Pressed for 1–5
seconds
If FN key mode is «LED blink mode switch»
Green Release to start data recording (post-
processing occupation mode undefined).
If FN key mode is «Occupation mode switch»
Green Release to start recording (Kinematic or
Static post-processing occupation mode).
Pressed for 5–8
seconds Red Release to turn serial port A baud rate to
9600 bps.
Pressed for > 8
seconds No light No function.
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KEYS AND LEDS
FN Key and REC LED
When data recording is ON, and the FN key is...
Not pressed
Red No free memory; hardware problem with
data recording.
If FN key mode is «LED blink mode switch»
Green Data recording started (post-processing
occupation mode undefined).
If FN key mode is «Occupation mode switch»
Green Data recording started (Kinematic post-
processing occupation mode).
Orange Data recording started (Static post-
processing occupation mode).
Pressed for < 1 second
If FN key mode is «LED blink mode switch»
Orange Release to change information mode.
If FN key mode is «Occupation mode switch»
Orange Release to toggle between Static and
Kinematic post-processing modes.
Pressed for 1–5 No light Release to stop data recording.
Pressed for 5–8
seconds Red Release to turn serial port A baud rate to
9600 bps.
Pressed for > 8
seconds No light No function (data recording still on).
Table 2-1. FN Key Functions and REC LED Status (Continued)
FN Key REC LED Status
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2KEYS AND LEDS
Information Modes
Information Modes
The receiver as usually has two information modes: Normal and Extended
Information Mode (EIM).
Normal
In normal mode, the STAT LED indicates the number of tracked satellites
and the position's computation status.
Extended Information Mode (EIM)
Extended Information Mode is used for receiver testing purposes. In this
mode, the receiver continues to work as usual, but the STAT LED indicates
the following “extended” information:
• Delimiter - an easily distinguishable double-blink that shows the overall
status of tests performed in EIM. The STAT LED color for delimiter is
calculated from the colors of other STAT LED blinks.
–Orange: at least one blink is orange.
–Red: no orange blink and at least one red blink.
–Green: all other cases.
• Sufficient data for position computation.
• GPS S/N ratios are good (Table 2-2).
• GLONASS S/N ratios are good (Table 2-2).
• Oscillator's frequency offset is less than three ppm.
• Oscillator's Allan Variance is better than 2.7e-10.
• Continuous tracking time is more than 15 minutes.
Table 2-2.
Signal-to-Noise (S/N) «Good» Ratios
CA/L1 P/L1 P/L2
GPS 51 39 39
GLONASS 51 49 40
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KEYS AND LEDS
Information Modes
• In EIM, the STAT LED blinks seven times per cycle. Each blink could
be orange, red, or green.
• Orange – information for test unavailable.
• Green – receiver passed the test.
• Red – receiver failed the test.
1. To switch to EIM, press and quickly release (within one second) the FN
key on the MinPad.
2. Watch for the delimiter double-blink. With good receiver, antenna, and
observation conditions, all blinks should be green within 15 minutes of
powering on.
• Green - ok
• Orange - wait
• Red - some tests failed
3. To switch back to normal, press the FN key.
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2KEYS AND LEDS
NVRAM clearing with MinPad
NVRAM clearing with MinPad
It is possible to clear NVRAM using only MinPad. To do that:
• Turn the receiver OFF.
• Press and hold FN button.
• Press and release PWR button to turn the receiver ON.
• Wait until both LEDs will light green.
• Wait around five seconds, until both LEDs will blink orange.
• Release FN button.
Note that LEDs will blink orange only during next five seconds, and to clear
NVRAM it is essential to release FN button when they blink yellow.
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KEYS AND LEDS
RX LED
RX LED
Your receiver may be equipped with a different modem type, e.g. with PDL
receiver from Pacific Crest or with JNS 2W UHF 410-470 radio transceiver,
with JNS 1W UHF902-928 MHz radio transceiver, L-Band/Beacon receiver, or
with single GSM/GPRS radio modem. The color of the RX LED indicates if the
modem has power, is receiving signals, or is turned off. The RX LED shows
status of the modem’s operation.
L-Band/Beacon Receiver
The color of the RX LED indicates the status of the differential corrections for
the L-Band/Beacon board.
The command BR002RG changes over the Red and Green
LEDs.
Mode LED Status Explanation
L-Band
No light Receiver is turned off.
Green flashes Receiver is searching for the selected L-Band satellite.
Solid green The selected L-Band satellite is locked.
Solid green +
red flashes
The L-Band satellite is locked and raw data is being
received.
Beacon
No light Receiver is turned off.
Green flashes The receiver is scanning for a Beacon station signal.
Solid green A signal from the Beacon station is locked
Solid green +
red flashes
The receiver is tracking the signal from the Beacon station
and RTCM messages are being received.
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2KEYS AND LEDS
RX LED
JNS 2W UHF 410-470 MHz radio transceiver
PDL Modem
• No light – the modem is turned off.
• Green – the modem is on, but signal reception has not started.
• Orange – the modem is receiving a signal.
Single GSM/GPRS radio modem
JNS 1W UHF902-928 MHz radio transceiver
LED Status Explanation
No light Modem is turned off.
Solid green Modem is in waiting mode.
Solid green + red flashes Modem is receiving data.
Solid red Modem is transmitting data.
Red flashes + green flashes Modem is in command mode.
LED Status Explanation
No light Modem is turned off.
Solid orange Modem is not registered in network.
Solid green + red flashes every 2 sec. Modem is registered in network and is in
waiting mode.
Solid green + red flashes every 0.5 sec. Modem is during a call and receives/
transmits data
LED Status Explanation
No light Modem is turned off.
Green flashes Modem is in receiver mode.
Solid green A radio link has been established; modem
is ready to receive data.
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KEYS AND LEDS
RX LED
LED Indicator for JNS Tri-Band Receiver
The color of the RX LED indicates the status of the differential corrections
for the Tri-Band board.
Solid green + red flashes Modem is receiving data.
Solid red Modem is in transmitter mode.
Red flashes
A fault condition has been detected.
Check the condition of the radio
modem’s antenna to make sure it is not
damaged and connected properly and
securely. Also, make sure that there are
no conducting objects near the antenna
location.
Red flashes + green flashes Modem is in command mode.
LED Status Explanation
The RX LED indicates the L-Band signal status
Flashes green The satellite signal is being searched
Solid green The satellite is locked.
Solid green + red flashes The data is being received
The RX LED indicates the Beacon signal status
Flashes green the Beacon station signal is being searched
Solid green The Beacon station is locked
Solid green + red flashes The data is being received
The RX LED indicates the UHF signal status
Solid green The UHF is ready to receive a signal
Solid green + red flashes The data is being received
LED Status Explanation
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2KEYS AND LEDS
Battery LED
Battery LED
The color of the BATT LED indicates the level of internal battery charge in the
receiver:
• Green – indicates greater than 90% charge.
• Orange – indicates an intermediate charge.
• Red – indicates less than 10% charge.
The pattern of blinks of the BATT LED also indicates the source of power.
• Solid light – an external power supply is used and the batteries are not being
charged.
• Blinking once a second – the batteries are being charged.
• Blinking once every five seconds – the receiver uses the internal batteries
for power.
• Not blinking – the receiver is in Zero Power Mode or the internal batteries
are completely discharged and no external power is connected.
Notice:
When the internal batteries have completely discharged
and no external power is connected, the receiver will go
into Zero Power Mode to prevent the batteries from over
discharging.
Table of contents
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