ComNav Technology M300 User manual

M300 GNSS Receiver Quick Tour
ComNav Technology Ltd.
www.comnavtech.com

Contents
Chapter 1 M 300 package list .......................................................................................................................1
1.1 package list..........................................................................................................................................1
1.2 M300enclosure receiver introduction ................................................................................................1
Chapter2 System installation........................................................................................................................2
2.1 Front panel introduction.....................................................................................................................2
2.2 Antenna installation............................................................................................................................2
Chapter 3 Configuration OEM Card by CRU software ..................................................................................3
3.1 connected with GNSS receiver............................................................................................................3
3.2 Receiver configuration........................................................................................................................4
3.2 Raw data recording set up. .............................................................................................................4
3.2.2 Get correction message from Radio or Ntrip ..............................................................................6
3.2.3 Work mode configuration............................................................................................................7
3.3 main information check......................................................................................................................8
3.3.1 Satellites information and global map view ................................................................................8
3.3.2 RTK status indication....................................................................................................................9
3.4 Raw data management.....................................................................................................................10
3.4.1 Raw data download ...................................................................................................................10
3.4.2Memory management................................................................................................................11
3.4.3 Rinex convert .............................................................................................................................11
3.5 Sending command to Receiver .........................................................................................................12
Chapter 4 M300 Frequently Used ASCII Command....................................................................................14
4.1 Base station configuration ................................................................................................................14
4.2 Rover configuration ..........................................................................................................................15
4.2.1 Set Rover to differential mode...................................................................................................15
4.2.2 Check the solution type .............................................................................................................16
4.3 Change the serial port band rate......................................................................................................16
4.4 satellites constellation system configuration ...................................................................................17
4.5 log raw data of GNSS observations...................................................................................................17
4.6 update the OEM Card .......................................................................................................................18
4.7 update radio firmware......................................................................................................................19
Appendix A..................................................................................................................................................21

1
Chapter1 M300 package list
1.1 package list
Thanks for choosing ComNav M300 enclosure GNSS receiver, after you receive the goods,
please check the package list as follows.
Raw.
Name
No.
Index
1
Enclosure receiver
1
2
A/C adapter
1
3
Data cable
1
From PC to receiver, RS232 to 7 pin cable
4
GNSS antenna
1
5
GNSS antenna cable
1
6
Radio antenna
1
Some special application case, special antenna
supplied
1.2 M300 enclosure receiver introduction
M300 receiver; with 1 GNSS OEM card inside, and integrate with radio data link, which is
mainly used in high accuracy positioning, Monitoring, construction, marine and so on.
M300 GNSS receiver

2
Chapter2 System installation
2.1 Front panel introduction
M300 receiver
Ref. # Description
❶3 LED, indicates the work status of Receiver.
a; Power indicator; after power on, this LED will light in red colour
b; satellites indicator, it will flash several times every 5 seconds, which means how many
satellites locked by receiver.
c; correction message, As base station, if flash 1/s means sending correction message 1/s; as
Rover means received correction 1/s; in the raw data recording mode(data recorded in the
memory of receiver), this LED also will flash according to Sampling interval.
❷TNC GNSS antenna connector.
❸TNC UHF antenna connector.
❹DC 1, serial port communication with OEM(port 1) card. Appendix A the Pin definition of
this port.
❺DC3, serial port communication with internal UHF and OEM(port 3) card.
2.2 Antenna installation
Installation of GNSS antenna is avery important factor to effect the preference of Receiver, it
will have big influence on visible satellite and SNR, be sure to fix antenna in open area and be
far from big power electromagnetic radiation device.
1
4
3
2
5

3
Chapter 3 Configuration OEM Card by CRU software
Introduction
Compass Receiver Utility is a windows-based GUI that allows you to access your receiver’s many
features without the need to use a terminal emulator or to write special software. CRU lets you
easily communicate and configure your receiver via serial port, Ethernet connection usea PC to
run the Windows XP or Windows 7 operating system.
Note; please go to ComNav website
http://www.comnavtech.com/download.asp?bigclassid=28, to download the software and
installation in PC.
3.1 connected with GNSS receiver
You can use serial port of PC to connect with receiver, the default band rate is 115200(OEM
Card band rate)
Go to Set port-> after setup the connections, click OK
If connect successfully, you will see the SN number of receiver and it will show on the left top of
software operation window; if not, please check the power and connection of all parts.

4
Ref. # Description
❶Connection status; SN No. of receiver, the data download path. You can select the data
download path from the left function bar-> Folders, select the folder path.
❷Main menu; all the operation of software menu can be found here
❸Shortcut bar; make you easy to access some frequently operation
❹Function bar; select the function, such as data download, convert to Rinex data.
❺Main window; show the information such as PVT view, SV sky plot view, hyper terminal.
3.2 Receiver configuration
3.2 Raw data recording set up.
Go to the shortcut bar, click ,
Satellites configuration;
Mask angle, GPS/Beidou/Glonass
Raw data sample interval, 1/2/5.
Data log; auto mode—save the raw data in the memory of OEM card (100MB memory card)
1
2
3
4
5

5
Local log; log the raw data to local PC, the file name will be auto named in the current folder
path, in this mode; you can define the raw data message type.

6
3.2.2 Get correction message from Radio or Ntrip .
3.2.2.1Internal Radio setup
This step is for setting up internal UHF frequency and protocol，you must use your laptop link
with DC/3 port to set radio parameters. Go to , set up the Frequency and protocol (same
as external transmit radio).
Tips; the internal radio airlink rate is 9600bps, and the radio is linked to COM2 of GNSS board as the
band rate 115200bps. So you must set the airlink band date of Transmit radio 9600 bps, and the com 2
band rate of GNSS board as 115200 bps(the default band rate is 115200)
3.2.2.1Get correction message from Ntrip
Make sure your laptop can use internet.
Go to , there allows two protocols to get the correction data by internet-TCP direct or
Ntrip mode; If the protocol is TCP direct mode, input the IP address and port and click connect;
If use the Ntrip mode, select the Ntrip mode and then click Connect.
This page shows the Ntripmount point, select the right mount point and input the User name
and password, at last lick ok.

7
3.2.3 Work mode configuration
Change the work mode (Base station or Rover); edit the command package that sent to OEM
card.
For example, if you want to start M300 as Base station, go to , some predefined command
package list can be seen below;

8
Click Edit, You can edit the command package that sent to receiver, then click ok;
Click apply and follow the indication to start base M300 as Base station.
After starting base station, use DC/3 link with external radio, set the external radio interface
band rate as 38400 bps (to match with the correction message)
3.3 main information check
3.3.1 Satellites information and global map view
: The output message by receiver, such as binary or GPGGA information
satellite information such as SNR and elevation; you can go to the main menu,
View-> Sky view, click the constellation to enable or disable the SV system.

9
Make sure your PC is log on internet; this will show the current position on
global map.
3.3.2 RTK status indication
After receiver receives correction message, the receiver will calculate the ambiguity and turn to
differential mode.
❶Position mode; SINGLE->Narrow Float ->NARROW INT (autonomous mode-> RTK Float-
>RTK fixed)
❷Differential age; 99 (No correction message), 1 (received correction message).
❸Diff; Correction message data flow.

10
3.4 Raw data management
3.4.1 Raw data download
Raw data can be recorded in the memory of receiver or PC.
Download the data from memory of receiver; go to , the files list will appear in
the Main window, you can modify the raw data, such as station name and antenna height. After
selecting the file and right click, download to the current folder.
1
1
2
1
3
1

11
3.4.2Memory management
Go to the Shortcut Bar, go to , you can format the memory or Clear the files that you
delete to the recycle bin.
3.4.3 Rinex convert
After downloading to the project folder, you can covert the Raw data to Rinex format, Go to the
function bar, click , you will see the raw data in current project.
Go to the shortcut bar- , define the Rinex version and export observation information;
then go to the main window, select the file and right click, convert to Rinex format. Go to the
raw data files to check the Rinx format data.

12
3.5 Sending command to Receiver
In the shortcut men, go to , in this page you can send ASIC command to receiver.

13
Operation tips;
Interfacemodecom3 autoauto on
Set com 3 auto detecting correction message and get to differential mode, but at the same time any
command sent through com3 will not respond.
Interfacemode com3 compass compass on
Set com 3 not to detect correction message and receiver will turn differential mode to autonomous
mode, and then COM3 can accept all the OEM card commands.
The default setup for COM3 is “interfacemode com3 auto auto on”, so you have to send command
“interfacemode compass compass on”, then send OEM card command though com3; but for com1, you
can send any command to receiver.

14
Chapter 4 M300 Frequently Used ASCII Command
Tips;
1. All the commands send to receiver, do not distinguish between letter case; Such as; Log
version=LOG VERSION.
2. After inputting every command, press Enter button to change line and input another
command.
3. For more detailed command
information, please read ComNav OEM CARD REFERENCE MANUAL.
4.1 Base station configuration
Sending command to DC1, RTCMV3 as the broad cast, the default band rate is 115200bps.
Command
Description
Unlogall
remove all log information currently in used
fix auto
Fix the current coordinate as Base station
log com3 rtcm1004
ontime 1
com3 output EXTENDED GPS RTK L1/L2
log com3 rtcm1104b
ontime 1
com3 output EXTENDED Beidou RTK B1/B2/B3
log com3 rtcm1012b
ontime 1
Com3 output Extended GLONASS RTK L1/L2
Log com3 rtcm1005b
ontime 5
Base station coordinates
com com3 9600
change the com3 band rate as 9600bps
saveconfig
Change the band rate to 9600, then send the command, save the current setting to the
receiver, next time power on receiver those setting will active
Tips; There are 3 types of GNSS RTK observations according to constellation system, GPS(RTCM1004),
Beidou(RTCM1104) and Glonass(RTCM1012), send different command according to the function according to
module.
For example; use D1 connect with interface board, use com3 to output RTCM V3, send the
following command(request GPS and Beidou RTK observations);
unlogall
fix auto
log com3 rtcm1004b ontime 1
log com3 rtcm1104b ontime 1
log com3 rtcm1005b ontime 5

15
com com3 9600
saveconfig
Tips; if you want to start the base station on known points, such as (31.123 N degree,
123.456E, 45 Height), please fix the base station coordinates by using the command
Fix Position 31.123 121.456 45.
4.2 Rover configuration
4.2.1 Set Rover to differential mode
INTERFACEMODE <port><input-message><output-message> ON
For example; use DC3 to receive external correction message, send the following
commands;

16
Command
Description
Com com3 9600
Match the correction message band rate with Base station
interfacemode com3 auto auto on
Auto detect the correction message type
Saveconfig
Save the setting to the receiver
4.2.2 Check the solution type
Send command to output GPGGA information to check the solution type;
Log <port> GPGGA ONTIME <Frequency>
Frequency description; 1(HZ), 2(2 seconds), 0.2(5HZ)
For example;
$GPGGA,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>,<9>,M,<10>,M,<11>,<12>*hh<CR><LF>
$GPGGA,012827.00,3110.484867,N,12123.913553,E,4,05,1.4,39.4,M,8.012,M, 2.0,0031,*6E
<6> GNSS solution type：0=Fix not available，1=GPS FIX，2=RTD，4=RTK FIXED，5=RTK floating,
6= Dead Reckong mode, 7= Manual input mode, 8= Super wide-lane mode,9= WASS MODE
4.3 Change the serial port band rate
To check the current Com Port band rate,
Log comconfiga
The reply is as follow;

17
Change the band rate command
Com <port><band rate>
For example; com com1 9600 /change com1 band rate as 9600bps/
4.4 satellites constellation system configuration
Command
Description
lockout bd2
Lock out Beidou system
lockout gps
Lock out GPS system
Lockout glonass
Lock out glonass system
Unlockoutall
Unlock all GNSS system
4.5 log raw data of GNSS observations
Raw data request command;
The ephemeris request in two different formats, you can use either of them;
ComNav Raw data Request command
(ephemeris in ComNav format)
ComNav Raw data Request command
(ephemeris compiler with Novatel format)
log com1 rangecmpb ontime 1
log com1 rangecmpb ontime 1
log com1 rawephemb onchanged
log com1 gpsephemb onchanged
Log com1 glorawephemb onchanged
Log com1 gloephemerisb onchanged
log com1 bd2rawephemb onchanged
log com1 bd2ephemb onchanged
Command explain
Ecutoff 13 \se the mask angle as 13 degree\
log com1 rangecmpb ontime 1 \set com 1 output cmp1in binary data format, the frequency is 12HZ\
log com1 rawephemb onchanged \if gps ephemeris changed, output 1 time \
log com1 bd2rawephemb onchanged \if beidou ephemeris changed, output 1 time \
Log com1 gloephemerisb onchanged \ Output glonass ephemeris\
saveconfig \save the setting to receiver, next power on it will auto output\
1. CMP channel measurements for the currently tracked satellites.
2. The MAX out frequency is 20 Hz, if using 20HZ, please send the command

18
SET CPUFREQ 624 \change CPU frequency more faster to support 20HZ\
Morally we use 10HZ, 5HZ, 2HZ and 1HZ, the relative command is 0.1/0.2/0.5/1
After sending those commands, the raw data will output by receiver and save the data in your
PC. Using ComNavRinex convert tools to covert the data to Rinex, then you can analyse the data
in any software.
4.6 update the OEM Card
You must use the serial port of PC to do update, connect your PC with DC1.
Open the update file***.exe, go to App->Link Setup, select the right serial port of your PC, then
click ok, click link.
Click update, the programme bar will make progress, this will take a few seconds.