Replacing GPS with a beeter unit - How to build the cable

Anything Related to the Humminbird 1199,1198,1197c Side Imaging Units
radudragusi
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Replacing GPS with a beeter unit - How to build the cable

Postby radudragusi » Sat Nov 29, 2008 2:17 am

I Want to replace the GPS unit with a more accurate one.
I have some better units from Trimble but I do not know how to build the connection cable.
The units are able to send NMEA 0183 message via serial ports.

radudragusi
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Serial F(RS 232) to 1197 (GPS connector)

Postby radudragusi » Sat Nov 29, 2008 2:29 am

I need this cable.
Serial F(RS 232) to 1197 (GPS connector)

Humminbird_Greg
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Postby Humminbird_Greg » Tue Dec 02, 2008 1:57 pm

The only cable we sell for this is the AS-HHGPS cable. It was intended for connecting a Hand Held GPS to one of our units but it is also used for connecting other GPS units to our units.
Greg Walters at Humminbird
gwalters@johnsonoutdoors.com
I help because I can

radudragusi
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Postby radudragusi » Fri Dec 05, 2008 2:39 am

THX.
It look ok ... do you know how many wires are inside the cable eventualy the pinout

Humminbird_Greg
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Postby Humminbird_Greg » Fri Dec 05, 2008 9:35 am

There are 4 wires in the cable but you will only be using the Black and White wires.


Image
Greg Walters at Humminbird

gwalters@johnsonoutdoors.com

I help because I can

Alaskan Koda
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Postby Alaskan Koda » Thu Oct 29, 2009 2:29 am

radudragusi

understand that even if you purchase a connection cable to plug in another GPS unit, the GPS map will not display on the humminbird unit. it will only display the latitude and longitude coordinates....

diver651
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Map Image Display

Postby diver651 » Fri Oct 30, 2009 8:10 pm

Alaskan Koda,

Either I misunderstand what you are saying, or you may be mistaken. From my experience, the GPS just communicates the coordinates as part of the NMEA string, and the unit uses this data to locate your position on the built in or card based maps on the Humminbird.

The GPS unit should have nothing to do with the maps.

Anyone is welcome to correct me if I am wrong, but I have used two different HB units and a Garmin E-Trex with my 1197.

Regards,
Mike

Humminbird_Greg
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Postby Humminbird_Greg » Sat Oct 31, 2009 12:33 pm

Mike,
I think that is what he was saying.

Good point to clarify though as I’ve dealt with many that did not understand that the maps do not get transferred through the GPS Receiver (or any other unit to unit connection).
Greg Walters at Humminbird

gwalters@johnsonoutdoors.com

I help because I can

radudragusi
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Postby radudragusi » Fri Jan 15, 2010 6:19 am

Thx for helping me in building the cable.

I managed to set my gps to send over the serial port the NMEA messages.
This is what I received (Hyper terminal)

$PTNL,VGK,110108.00,011510,00000.000,00000.000,00000.000,1,04,4.6,M*05
$GPGSV,2,1,7,3,70,216,49,6,68,186,46,26,38,105,34,14,32,136,44*48
$GPGSV,2,2,7,19,62,298,46,21,14,090,,22,68,065,31*73
$GPZDA,110109.28,15,01,2010,00,00*62
$PTNL,GGK,110110.00,011510,4428.07140683,N,02603.77081898,E,1,04,4.6,EHT116.445,M*7E
$GPVTG,60.55,T,,M,0.05,N,0.10,K*62
$GPGST,110117.0,0.482,18.085,4.366,318.2,12.491,13.787,13.918*62
......

it look ok to me.

I have some problems with my device setup . In accesory test screen the system report UNCONNECTED beside the GPS. I need some extra information about how the system in detecting the gps unit.

I do not know if the unit detect the power or the NMEA messages on port. Do I need to connect TX(com) To NMEA In (1197) or RX(COM) to NMEA IN (1197)

THX

radudragusi
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Postby radudragusi » Sun Jan 17, 2010 6:09 am

This is what the default GPS is sending

$GPRMC,110119.00,A,4428.05407,N,02603.76283,E,0.190,252.98,170110,,,A*6E
$GPGGA,110119.00,4428.05407,N,02603.76283,E,1,06,3.35,98.3,M,36.0,M,,*62
$GPRMC,110120.00,A,4428.05412,N,02603.76276,E,0.167,252.92,170110,,,A*68
$GPGGA,110120.00,4428.05412,N,02603.76276,E,1,06,3.35,98.3,M,36.0,M,,*66

It is a 4800,8,n,1 com device

radudragusi
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Postby radudragusi » Sun Jan 17, 2010 7:27 am

I managed to connect the devices. (CONNECTED in ststem test view).
It look like the 1197 cannot read the messages delivered by the GPS.
Is it possible to change the format accepted by the 1197? Do I need to ask the Humminbird Dev team to change the Firmware for this?

SilmarilS
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Location: Canada, QC

Postby SilmarilS » Sun Jan 17, 2010 12:52 pm

I use a hand held GPS in the same way as you, but on a HB 718 Model, and everything works fine.

radudragusi
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Postby radudragusi » Mon Jan 18, 2010 4:15 am

Thx,

The message structure is diffrent.

If the software team from Humminbird will not I'll try to build a small format convertor using a microcontroller. (PIC 18F...).

I asked one of my friends to build the HW for this.

And I'll help with the sw.

PS. I'm using a Trimble 4700 Geodetic receiver (2cm in RTK mode, 0.5m independent mode)

SilmarilS
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Location: Canada, QC

Postby SilmarilS » Tue Jan 19, 2010 3:01 am

Normally, the NMEA data should be standard in differents units?

radudragusi
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Postby radudragusi » Mon Jan 25, 2010 8:13 am

It is possibe to extract exactly the same information from fiffrent Mesages.
Unfortunately I do not have the possibility to select anotther message for extracting the information.

To be more detailed I'll show you one example:

It look to me like the HB software team is using the RMC message for Speed extraction.
The same information exist in VTG message.

From my point of view the best option is to create an external config file editable by the users. By using the file the HBSI units will be more flexible on imput side.

I'll build a small format convertor using a microcontroller PIC18xxx until they will decide to inplement my requests. Btw the cost for such sevice will be arround 300USD.


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