Geonics Limited EM61MK2A User manual

EM61MK2A
1745 Meyerside Drive, Mississauga, Ontario, Canada L5T 1C6
Tel: [phone] Fax: [phone]
E-mail: [email protected]
Geonics Limited
February, 2005
Version 2.20
EM61MK2 DATA LOGGING SYSTEM
FOR FIELD COMPUTER Allegro Field PC
OPERATING INSTRUCTIONS
(MS DOS Version)

Table of Contents
1. Introduction ................................................................................................ 1
2. Program Requirements ................................................................................. 2
2.1 Contents of EM61MK2 disk ................................................................. 2
3. Installing EM61MK2A .................................................................................. 2
4. Running EM61MK2A Program ...................................................................... 3
5. Main Menu................................................................................................. 4
5.1 Short description of Main menu options ................................................. 4
6. Antenna Size Menu ..................................................................................... 5
7. Monitor/Null Menu ..................................................................................... 6
7.1 Description of Monitoring/Nulling menu options ..................................... 8
8. Logger SetUp Menu .................................................................................. 12
9. Set Port for GPS ........................................................................................ 15
9.1 Monitoring GPS Receiver Output ......................................................... 16
10. Set Output Port ......................................................................................... 18
11. Advanced COM Setup............................................................................... 19
12. Acquiring Data Menu and Logging ............................................................. 21
12.1 Create File Menu ............................................................................. 21
12.2 Survey SetUp Menu .......................................................................... 22
12.3 Survey SetUps .................................................................................. 26
12.4 LOG DATA Menu ............................................................................. 27
12.5 Field Options ................................................................................... 30
13. File Manager ............................................................................................ 37
14. Data Transfer (Upload Files) ....................................................................... 37
14.1 Data File Formats ............................................................................. 37
14.2 Upload Files Procedure ..................................................................... 38
15. View Files ................................................................................................. 42
16. Delete Files ............................................................................................... 43
17. End Program............................................................................................. 44
Appendix A ....................................................................................................... 45
A.1 Using the EM61MK2A with a GPS Receiver .......................................... 45
A.2 Description of GGA and GSA Data Messages ...................................... 46

Appendix B ....................................................................................................... 47
B.1 Description of Data File in EM61MK2 Format ....................................... 47
B.2 Conversion Factors ............................................................................. 50
B.3 Example of File in EM61MK2 Format ................................................... 52
B.4 Example of Converted Output Format .................................................. 53
Appendix C ...................................................................................................... 54
C.1 Performing Hard Reset in Allegro and Pro4000 .................................... 54
C.2 Panning the Display in Allegro and Pro4000 ........................................ 54
C.3 Operating DOS in Allegro .................................................................. 54
C.4 Short Overview of Programs FileScout/ProShell and Lynx ....................... 54
C.5 File Transfer Using Lynx ...................................................................... 55
Appendix D ...................................................................................................... 56
D.1 Installation of the Quatech QSP-100 Card in Allegro (or Pro4000) ........ 56
D.2 Installation of the Quatech SSP-100 Card in Allegro (or Pro4000).......... 58

1
EM61MK2 Data Logging System (DAS70/61MK2)
1. Introduction1. Introduction
1. Introduction1. Introduction
1. Introduction
The Geonics EM61MK2 Data Logging System (DAS70/61MK2) consists of a field computer
Allegro (or Pro4000), data logging program EM61MK2A (or EM61MK2P for Pro4000), and
associated cable to connect the Polycorder to the Geonics EM61-MK2 instrument. The program
EM61MK2A is designed for the Allegro field computer, although, if necessary it can be used with
any other IBM compatible computer running a MS DOS operating system and equipped with
serial port. The only disadvantage of using a standard laptop computer, will be small size of the
displaywhich is limited for the Allegro. This documentation describes the use of the EM61MK2A
program used with the Allegro field computer, and the Geonics EM61-MK2.
The program EM61MK2A records data together with a time stamp at each station. Data files
created with this program can be used to position a surveyaccording to locations recorded separately
by a Global Positioning System (GPS).
The EM61MK2A will also accept NMEA-0183 compatible data from a GPS receiver directly
connected to an Allegro field computer. GPS datawhichare embedded in the EM61MK2 data file
can be processed later in the Geonics DAT61MK2 program. The connected GPS must be able to
stream NMEA-0183 compatible messages. The EM61MK2A uses two NMEA messages GGA
and GSA. While message GGA is mandatory, the GSA string is used only to provide information
related to the GPS signal quality.
Program EM61MK2A acquires and records survey data from the EM61-MK2 system, under the
control of the operator. It also records various field information such as survey line number (line
name), starting station, increment, comments, etc. Readings can be displayed in text or graphic
mode. Readings are displayed in real time in mV. In addition, the program allows to monitor the
instrument output while data are not recorded. The EM61MK2A also continuously monitors the
condition of the instrument battery, without leaving the program. The EM61MK2A also provides
the possibility of automatic nulling of the instrument output.
The program allows the user to set the EM61-MK2 into a specific instrument mode of operation:
AUTO, Wheel, orManual modes. In AUTO mode readings can be automaticallyrecorded in desired
time intervals. In WHEEL mode readings are triggered by a counter installed at the EM61-MK2
wheel assembly, and in MANUAL mode readings are triggered manually by the operator. The
program allowsyou to record data while using the standard EM61-MK2 antennas (0.5 x 1 m, 1 x 1
m, or 0.5 x 0.5 m sensors) as well as Geonics EM61-MK2 Hand Held sensor.
Survey setup parameters are saved in a file,therefore they can be automatically used during subsequent
data collection sessions. In addition, ten preset survey setups are provided. These setups are user
selectable, they can be edited and saved for future use.
The EM61MK2A also continuously monitors the condition of the instrument battery, without
leaving the program.
In addition to logging EM61-MK2 data, the EM61MK2A provides data file management tasks.
The program allowsyou to upload data files to a PC running the DAT61MK2 program. It also has
options allowing viewing and deleting data files. Data files are always saved to the programs current
directory. Data file names, which can be set by the program based on the computer clock or they
are user specified, have extension names R61.

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Over 1,000,000 readings can be collected in the field computer Allegro with the standard memory
of 8 Mb. The maximum speed of data collection is approximately 15 readings per second in text
mode, and 12 readings per second in graphic display mode. In graphic display mode, the profile
containing the last 140 (or 84 in Pro4000) data readings for each channel is displayed.
2. P2. P
2. P2. P
2. Program Rrogram R
rogram Rrogram R
rogram Requirementsequirements
equirementsequirements
equirements
To successfully use this software, you will need :
Computer
Field computer Allegro or Pro4000
or alternatively:
- IBM PC and compatibles,
- Minimum 640 Kbytes of available memory,
- DOS 3.1 or higher,
- Floppy drive or other mean to transfer files,
- CGA graphics capability,
- One Serial Port
- optionally, Two Serial Ports if directly connected GPS system is to be used.
Geonics EM61-MK2
The EM61-MK2 instrument with associated cables.
2.1 Contents of EM61MK2A disk2.1 Contents of EM61MK2A disk
2.1 Contents of EM61MK2A disk2.1 Contents of EM61MK2A disk
2.1 Contents of EM61MK2A disk
The program EM61MK2A is stored on DAT61MK2 CD disk or on one 3.5" floppy disk. All
necessaryinitial files (with extension names .INI) are created in your computer after the program is
run for the first time. Check that the file EM61MK2A.EXE (and EM61MK2P for Pro4000) is
included on the CD or floppy disk.
3. Installing EM61MK2A3. Installing EM61MK2A
3. Installing EM61MK2A3. Installing EM61MK2A
3. Installing EM61MK2A
While using the Allegro, Pro4000, or other field computer which is not equipped with a floppy
drive disk, the EM61MK2A.EXE file should be transferred from a PC computer using software
and serial cable provided by manufacturer.
On other computers the EM61MK2A program can be installed by copying the EM61MK2A.EXE
file to a directoryonyour hard disk. This can be performed by using Windows Explorer or at DOS
prompt (described below). It is assumed that A: indicates floppy drive, and C: indicates hard disk
drive.
A directory (i.e. EM61) can be created with the command MD from DOS.

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EM61MK2 Data Logging System (DAS70/61MK2)
C:\MD EM61
In order to access directory EM61, type:
C:\CD EM61
Once in EM61 directory the EM61MK2A.EXE file can be copied from the distribution disk.
C:\EM61\ COPY A:EM61MK2A.EXE
After you run the program for the first time it will create permanent initial files EM61MK2.INI,
SURVEY0.INI, SURVEY1.INI, etc. which contain some of the program settings. If the above
files do not exist on the default drive they will be created with default parameters during the first
execution of the program.
The EM61MK2 data files with extension name R61 will be created in the program current directory.
4. R4. R
4. R4. R
4. Running EM61MK2A Punning EM61MK2A P
unning EM61MK2A Punning EM61MK2A P
unning EM61MK2A Programrogram
rogramrogram
rogram
The EM61MK2A is a menu-driven program designed to be simple to use.
Most of the menus contains (from the top):
- name of the menu,
- informative window (instrument type, file name, etc.),
- list of options and parameters,
- list of available commands.
Menu selections are made using the Up/Down arrowkeys. The selected option is highlighted and
can be executed bypressing <ENTER>k e y.
Left and Right arrowkeys are used to edit selected parameter. When editing Up or Down arrow
keys can be used to exit current parameter.
The carriage return key is described as <ENTER>,<CR>, or symbol. Where permitted by the
program, the <Esc>key is used to quit the current menu and return to the former one.
In general, settings for most menus can be saved by the function key F1. The function key F2 is
used to cancel editing and to return to former settings.
While using the Allegro field computer the program can be started from the FileScout (or ProShell
for Pro4000) utility program by selecting its name. Otherwise, the program is started from a copy
on the working disk, by entering the name EM61MK2A in response to the DOS prompt, i.e.:
C:\EM61\EM61MK2AEM61MK2A
EM61MK2AEM61MK2A
EM61MK2A <CR>
While using the Pro4000 ProShell DOS utility or FileScout DOS File Manager in Allegro Field PC,
the computer system will prompt for parameters. Since there is no parameters required press simply
<ENTER>k e y.
After name EM61MK2A is entered, the menu, presented in the next section and afterwards called
MAIN MENU, is displayed.

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5. Main Menu5. Main Menu
5. Main Menu5. Main Menu
5. Main Menu
The Main Menu appears always as the first menu after the program is started. It contains the name
of the program, its version number, and list of available options. The EM61MK2A Main Menu is
displayed below.
These options are selected by using the Down and Up arrow keys. Use <ENTER>toexecute
the highlighted item. Short description for each of the options follows.
5.1 Short description of Main menu options5.1 Short description of Main menu options
5.1 Short description of Main menu options5.1 Short description of Main menu options
5.1 Short description of Main menu options
Monitor/Null
This option allows to monitor the EM61-MK2 output and optionally tonull the instrument,
perform Internal and External QC coil calibration, and checkavailable memory and battery
level of the logger.
Acquiring Data
Executing this option leads to the Data Acquiring Menu which allows to set up survey
options and logging parameters.
Antenna Size
This option allows to specify size of the standard sensor used for the EM61-MK2. It does
not apply if the EM61-MK2 Hand Held sensor is used.
Setup Logger
Menu that is associated with this option is used to set the date and time of the computer,
audio click, serial port number, type of pause key, and type of display (text or graphic).
Set GPS Port
This menu allows to disable and enable GPS data acquisition. This menu is also used to set
the serial port number used for GPS input, and to specify necessary serial port
communication settings.

5
EM61MK2 Data Logging System (DAS70/61MK2)
Set Output Port
This menu allows to disable and enable optional output to other devices.. This menu is
also used to set the format of the output string, serial port number used foroutput, and to
specify necessary serial port communication settings.
Advanced COM Setup
This option allows you to set address and interrupt level for each used serial port. These
parameters are necessary if more than two serial ports are used during data collection.
File Manager
This option contains three following items listed in File Manager menu:
Upload Files
This option allows to upload recorded data files to a PC computer running
DAT61MK2 program.
View Files The program will display list of available data files that can be reviewed.
Delete Files
This option allows to delete permanently not needed data files from the field
computer disk.
Exit
Selecting this option will terminate the program execution.
6. Antenna Size Menu6. Antenna Size Menu
6. Antenna Size Menu6. Antenna Size Menu
6. Antenna Size Menu
The Antenna Size menu allows to select the size of the EM61-MK2 sensor. If the EM61HH-MK2
Hand Held antenna is used this option can be ignored. If the standard antennas are used (1 x 0.5 m,
1 x 1 m, or 05 x 0.5 m) the size of the sensor must be specified before monitoring the instrument
output. This menu is presented below.
To select proper instrument type use Up and Down arrow keys and when highlighted press
<ENTER>. The currently selected instrument type will be displayed in the top portion of most
menus.

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7. Monitor/Null Menu7. Monitor/Null Menu
7. Monitor/Null Menu7. Monitor/Null Menu
7. Monitor/Null Menu
The Monitor/Null menu allows initial inspection of the range of the instrument readings at the
particular site, monitoring the instrument performance, quick inspection of the condition of the
instrument battery, and setting zero level of the instrument.
It is assumed that the instrument is turned ON prior to using this option. In case the instrument is
OFF or the instrument console is not connected to the computer the following message will appear:
Check the connection or turn the instrument ON and select the Monitor/Null option again.
Assuming that the instrument works properly the program will display Monitor/Null menu and
will start normalization session which lasts less than 10 seconds. At this stage the Monitor/Null
menu will display the following message:
After the normalization is finished the layout of the Monitor/Null menu is as follows:

7
EM61MK2 Data Logging System (DAS70/61MK2)
The EM61-MK2 readings are updated approximately 10 times per second during monitoring session.
If Mode 4was selected on the instrument panel channels 1, 2, 3, and 4will be displayed, and when
Mode D was selected (for Top and Bottom antennas) channels 1, 2, 3, and Twill be given in the
Monitoring menu. The level of the instrument battery is continuously updated (Bt:) in Volts. Battery
voltage is followed by label Mkr:which indicates state of the fiducial marker. When fiducial marker
is pressed then Yis displayed, otherwise label Mkr: is followed by N.
When GPS was Disabled in the Set Port for GPS menu a message GPS Disabled will be displayed.
If the GPS port is Enabled and a working GPS system is connected to the field computer the
Monitoring screen will display a few more parameters, as presented below.
In the above Figure one line of the display is dedicated to show the GPS status. A label DGPS
(Differential Global Positioning System) indicates that GPS readings are differentially corrected in
real time,while label AGPS (Autonomous Global Positioning System) indicates lack of differential
correction. On the right side of DGPS or AGPS label small square is displayed. This square should
move down and up with the frequency of GPS update rate (usually 1 second intervals). If the
square is not moving for long periods of time it means that the GPS system is not working or that
it is not connected to the field computer. The next label Pwith a value varying between 0 and 99.9
represents an index called Position Dilution of Precision (PDOP). The last label Sand following
number shows number of currentlytracked satellites.Refer to section 9 (Set Port for GPS), Appendix
A, and to GPS manuals for more information about GPS parameters.
A list of program functions available directly from the Monitor/Null menu is given at the botom
of the screen. The screen (presented below) containing all available options is displayed after key ?
or His pressed. Available options are as follows: N- Nulling, I- Internal Q-coil calibration, E-
External Q-coil calibration, M(or V) - displays field computer available memory, B- displays field
computer battery level (may not work correctly for loggers other than Allegro or Pro4000), key
<del>isavailable only in StandBy mode (see section 12), the function key F2 - exits the Monitor/
Null menu.

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7.1 Description of Monitoring/Nulling menu options7.1 Description of Monitoring/Nulling menu options
7.1 Description of Monitoring/Nulling menu options7.1 Description of Monitoring/Nulling menu options
7.1 Description of Monitoring/Nulling menu options
Nulling
To performnull of the instrument press the keyN. At this moment the computer takes 25
readings and calculates the instrument offset.
The calculated offset is applied to all the readings that follow this operation. If needed,
this procedure can be repeated several times until satisfactoryresults are obtained.However,
there is no associated “Undo” function. If original values (without calculated offsets) of
the EM61-MK2 readings are needed, exit the EM61MK2A program and run it again. The
EM61-MK2 instrument does not have to be turned OFF. Null operation can be also
performed later during data collection.
Internal QC Coil Calibration
The Internal QC coil calibration is described in detail in the EM61-MK2 Operating
Instructions.
To start the calibration using Internal QC coil press keyI. This action begins by performing
the automatic nulling which in this case is only in effect for the duration of the calibration
process. It will not affect EM61-MK2 readings. After the nulling is completed (less than 5
seconds) the Internal QC coil Calibration screen is displayed.
This screen displays timer with elapsed seconds and EM61-MK2 readings. This display
lasts for 60 seconds.During this time please follow the instructions provided on the Allegro
screen.

9
EM61MK2 Data Logging System (DAS70/61MK2)
Calibration can end in the following four ways:
The process can be stopped by an operator at any time by pressing key<Esc>.
The calibration may end by time out (60 seconds) if QC coil button was not
pressed or this action did not activate QC coil. The following screen will then be
displayed:
After pressing anykeythe program returns to Monitoring/Nulling manu. To repeat
Internal QC coil calibration please press keyIagain.
The logger will determine if the instrument has passed test. If after activating the
QC coil, the program determines that the reading is inside the standard values
within +/- 10% tolerances then a message“CALIBRATION OK” will be displayed
(see below).
Otherwise, if the program determines that the reading is outside of the test values
range the corresponding message “CALIBRATION FAILED” is displayed.

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Regardless of the test result (OK or FAILED) the readings will be saved on screen. The
program returns to Monitoring/Nulling menu after anykeyispressed. Then the calibration
process can be repeated.
External QC Coil Calibration
The External QC coil calibration is described in detail in the EM61-MK2 Operating
Instructions.
The procedure for the instrument check using External QC coil calibration is very similar
to the one described above for Internal QC coil calibration. To start the calibration process
using External QC coil press keyE. This action begins by performing the automatic nulling
which in this case is only in effect for the duration of the calibration process. It will not
affect EM61-MK2 readings. After the nulling is completed (less than 5 seconds) the External
QC coil Calibration screen is displayed.
This screen displays timer with elapsed seconds and EM61-MK2 readings. This display
lasts for 60 seconds.During this time please follow the instructions provided on the Allegro
screen.
Calibration can end in the following four ways:
The process can be stopped by ann operator at any time by pressing key<Esc>.
The calibration may end by time out (60 seconds) if QC coil button was not
pressed or this action did not activateQC coil. After pressing anykeythe program
returns to Monitoring/Nulling manu. To repeat External QC coil calibration please
press key Eagain.
The logger will determine if the instrument has passed test. If after activating the
QC coil, the program determines that the reading is inside the standard values
within +/- 10% tolerances then a message “CALIBRATION OK” will be
displayed.
Otherwise, if the program determines that the reading is outside of the test values
range the corresponding message “CALIBRATION FAILED” is displayed.
Regardless of the test result (OK or FAILED) the readings will be saved on screen. The
program returns to Monitoring/Nulling menu after anykeyispressed. Then the calibration
process can be repeated by pressing key E.

11
EM61MK2 Data Logging System (DAS70/61MK2)
Memory Check
After key M(or V) is pressed a small windowthat shows the amount of available memory
for data is displayed. The amount of available memory is given in Kbytes and in number
of EM61-MK2 readings (one EM61-MK2 record is 22 bytes long). If GPS data is taken
concurrently, one GPS record is equal to 5 or 6 EM61-MK2 readings (110 or 132 bytes).
Available memory is also checked automatically during data collection. In cases where the
amount of available memory in the logger is less than 10 Kbytes, the program will stop,
data file will close, and a proper message will be displayed.
Battery Check
After key Bis pressed a small window that shows the voltage of Allegro or Pro4000
battery (in Volts) is displayed. If other than Allegro or Pro4000 field computer is used the
displayed value may not be accurate (as shown in Figure below).
In addition Allegro and Pro4000 systems will also warn the user when battery voltage is
too low.
Help Screen
When key ?or His pressed a help screen that list all available options is displayed.
Option “<Del> Delete Reading” is available only during data collection.

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Exit Monitor/Nulling menu
To exit the Monitor/Null option press the function key F2.
8. Logger Setup Menu8. Logger Setup Menu
8. Logger Setup Menu8. Logger Setup Menu
8. Logger Setup Menu
This option allowsyou to set severalparameters in the logger. The Logger Set Up menu is presented
below.
Description of Parameters:
Date
This option allows you to change the date in the field computer clock. When the option is
highlighted pressing the ENTER, or Left or Right arrowkeys, enables editor that allows
the operator to change day, month and year.
The new date is accepted (and set in the computer) after the function key F1 is pressed.
Use Down or Up arrowkey to exit the editor and cancel any changes.

13
EM61MK2 Data Logging System (DAS70/61MK2)
Time
This option allows you to change time of the day in the field computer clock. When this
option is highlighted pressing the ENTER, or Left or Right arrowkeys, enables editor
that allows the operator to change hour, minute, and second.
The modified time is accepted (and set in the computer clock) after the function keyF1 is
pressed.
Use Down or Up arrowkey to exit the editor and cancel any changes.
Units
Two selections are available: Meters or Feet.
COM Port
The number of serial port that is assigned to the EM61-MK2. Available selections: COM1
and COM 2. The program default is COM1. Communication parameters for the selected
serial port are set by the program, since the EM61-MK2 operates Baud Rate (9600), Parity
(N), Data Bits (8), and Bit Stop (1).
This port must be different than the port specified in the Set Port for GPS menu (see
next), otherwise a message will be displayed and ports will have to be reassigned.
Audio
Two selections are available: Ye s or No. The audible click will be generated at eachreading
when this option is enabled.

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Pause key
Three selections are available: Any ke y, Alt+F1, and Ctrl+F5. This feature is used to
pause data recording during logging session. Default setting Any ke y can be changed to
one of the twokey combinations for field conditions where a loggerkey can be accidentally
pushed causing unwanted stop of data logging.
Display
This parameter specifies the display type during data collection. Two types of the display
can be selected: Text mode or Graphic mode.
In the text mode data for four channels is displayed in digital form. This mode is
recommended for the instrument AUTO mode when the highest possible frequency of
data collection is used. The same applies to Wheel mode since the data triggering can be
accelerated at any given moment (while passing a curb, downhill, etc.).
The graphic mode allows to displayprofiles forany selected channels in real time as well as
simultaneous display of readings in digital form for all four channels. When the Display
Graphic is selected, five additional parameters are activated (see menu below).
Parameters Ch 1, Ch 2 , Ch 3, and Ch 4 (applies to Ch T as well ) allowyou to enable (Yes)
or disable (No) display of each channel separately, while the option Amp. (Amplitude
Scale) can be selected as Compressed scale or Linear scale. The compressed amplitude
allows you to display the high dynamic range of the EM61-MK2 data in a legible way and
is recommended.
Regardless of which channels are chosen, data for all four channels will be displayed in
digital form below profile display.
Please note, thatreadings in digital form are always given in mV (linear scale) regardless
of the amplitude scale (compressed or linear) selection. Further, graphic display in the
compressed scale does not affect readings saved in the data file. Data are always written to
file in original form.
After all the parameters in the Logger Setup menu are updated press the function keyF1 to accept
the displayed settings. The program will return to the Main menu.
To return to the original settings (state before this option was selected) press the function keyF2.
All parameters will be reset to the initial settings and the program will return to the Main menu.

15
EM61MK2 Data Logging System (DAS70/61MK2)
9. Set P9. Set P
9. Set P9. Set P
9. Set Port for GPS Menuort for GPS Menu
ort for GPS Menuort for GPS Menu
ort for GPS Menu
After the Set Port for GPS option is selected in the Main Menu the Set Port for GPS menu appears
on the screen. This menu allows you to enable and disable the GPS input, specify serial
communication parameters matching GPS receiver settings, and to monitor the GPS output in
terminal mode (key F3). The menu is presented below.
GPS Input
This option allows you to Enable/Disable a serial port for GPS input. When Disabled is
chosen logging and monitoring screens will display message “GPS disabled” in place of
GPS parameters.
The GPS Input can be Enabled even if there is no GPS system connected to the Allegro.
In such case data file will contain proper sequence of EM61-MK2 readings without any
GPS input.
COM Port
The number of serial port that is assigned to the GPS input. Available selections: COM1
and COM 2. The program default is COM2. Communication parameters for the selected
serial port can be determined in options described below.
This port must be different than the port specified in the Logger Set Up menu (for EM61-
MK2), otherwise a message will be displayed and ports will have to be reassigned.
Baud Rate
Specify Baud Rate for the output port, the selected value should much the Baud Rate of
the GPS system, default is 9600.
Parity
Select Parity for the output port, the entered parameter should much the Parity set in the
GPS serial port settings, default is N.
Data Bits
Specify Data Bits for the output port, the entered value should much settings in the GPS
system, default is 8.
Stop Bits
Specify Stop Bits for the output port, the entered value should much settings in the GPS
system, default is 1.

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After all the parameters in the Logger Setup menu are updated press the function keyF1 to accept
the displayed settings. The program will return to the Main menu.
To return to the original settings (state before this option was selected) press the function keyF2.
All parameters will be reset to the initial settings and the program will return to the Main menu.
To activate terminal mode which allowsyou to monitor GPS receiver output press the function key
F3. The monitoring mode will workregardless of the GPS Input being Enabled or Disabled. This
option is described in the following section.
9.1 Monitoring GPS R9.1 Monitoring GPS R
9.1 Monitoring GPS R9.1 Monitoring GPS R
9.1 Monitoring GPS Receiver Outputeceiver Output
eceiver Outputeceiver Output
eceiver Output
After the function key F3 is pressed in Set Port for GPS menu the program will display the screen
in terminal mode. In this mode the screen is divided into three parts. The top portion of the
screen, labeled Receive GPS Data, displays the GPS receiver output. The middle portion labeled
NMEA Command is used to enter NMEA commands to be sent to the GPS receiver, and at the
bottom, the screen menu with available options is displayed. This screen is shown below.
As soon as the EM61MK2A screen is in terminal mode and the GPS is streaming data, the first 20
characters of each message will appear in the top portion of the display. The display is updated
with the frequency the GPS receiver outputs data. This allows you to recognize the GPS update
rate and type of messages being sent by the connected GPS. In cases where the GPS data is not
received bythe logger a message NO DATA and current time will appear in the top window of the
display, as shown below.
The message NO DATA is normally updated with a rate of 6 seconds. This may indicate the
following: serial port number not correctly specified in Set Port for GPS menu, GPS receiver not