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 Replacing GPS with a beeter unit - How to build the cable 
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Joined: Fri Nov 28, 2008 12:30 pm
Posts: 21
Location: Romania
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.


Sat Nov 29, 2008 2:17 am
Profile YIM

Joined: Fri Nov 28, 2008 12:30 pm
Posts: 21
Location: Romania
I need this cable.
Serial F(RS 232) to 1197 (GPS connector)


Sat Nov 29, 2008 2:29 am
Profile YIM

Joined: Tue Apr 17, 2007 6:26 pm
Posts: 4314
Location: Eufaula, AL.
Post 
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.

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Greg Walters at Humminbird
gwalters@johnsonoutdoors.com
I help because I can


Tue Dec 02, 2008 1:57 pm
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Joined: Fri Nov 28, 2008 12:30 pm
Posts: 21
Location: Romania
Post 
THX.
It look ok ... do you know how many wires are inside the cable eventualy the pinout


Fri Dec 05, 2008 2:39 am
Profile YIM

Joined: Tue Apr 17, 2007 6:26 pm
Posts: 4314
Location: Eufaula, AL.
Post 
There are 4 wires in the cable but you will only be using the Black and White wires.


Image

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Greg Walters at Humminbird
gwalters@johnsonoutdoors.com
I help because I can


Fri Dec 05, 2008 9:35 am
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Joined: Tue Jun 02, 2009 2:14 am
Posts: 7
Post 
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....


Thu Oct 29, 2009 2:29 am
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Joined: Thu Nov 29, 2007 1:07 pm
Posts: 45
Location: Cincinnati
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


Fri Oct 30, 2009 8:10 pm
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Joined: Tue Apr 17, 2007 6:26 pm
Posts: 4314
Location: Eufaula, AL.
Post 
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).

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Greg Walters at Humminbird
gwalters@johnsonoutdoors.com
I help because I can


Sat Oct 31, 2009 12:33 pm
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Joined: Fri Nov 28, 2008 12:30 pm
Posts: 21
Location: Romania
Post 
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


Fri Jan 15, 2010 6:19 am
Profile YIM

Joined: Fri Nov 28, 2008 12:30 pm
Posts: 21
Location: Romania
Post 
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


Sun Jan 17, 2010 6:09 am
Profile YIM

Joined: Fri Nov 28, 2008 12:30 pm
Posts: 21
Location: Romania
Post 
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?


Sun Jan 17, 2010 7:27 am
Profile YIM

Joined: Wed Oct 14, 2009 12:19 pm
Posts: 188
Location: Canada, QC
Post 
I use a hand held GPS in the same way as you, but on a HB 718 Model, and everything works fine.


Sun Jan 17, 2010 12:52 pm
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Joined: Fri Nov 28, 2008 12:30 pm
Posts: 21
Location: Romania
Post 
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)


Mon Jan 18, 2010 4:15 am
Profile YIM

Joined: Wed Oct 14, 2009 12:19 pm
Posts: 188
Location: Canada, QC
Post 
Normally, the NMEA data should be standard in differents units?


Tue Jan 19, 2010 3:01 am
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Joined: Fri Nov 28, 2008 12:30 pm
Posts: 21
Location: Romania
Post 
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.


Mon Jan 25, 2010 8:13 am
Profile YIM
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