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Author Topic:   Lowrance 525c interface with Uniden Oceanus DSC
In The Red posted 09-09-2010 09:06 AM ET (US)   Profile for In The Red   Send Email to In The Red  
I have a Lowrance LMS-525c and a Uniden Oceanus DSC installed on my boat. They were never interfaced to allow for the location information to be used by the vhf radio in the case of emergencies. So I looked into how to do that, and I believe I have successfully done so. When I turn on the COM port on the gps, it appears that it is working - the icon appears on the radio's display showing that it is recieving data from the gps. But... Once I do that, after a short period of time, the gps quits redrawing its screen as the boat is moving. It acts as though it no longer can see the satelites. If I turn the COM port connection to the radio off, and reboot the gps, the gps will then work just fine - until I turn the COM port back on again. I have double checked my connections and it seems to be correct. Does anyone have any ideas on this?
jimh posted 09-09-2010 09:19 PM ET (US)     Profile for jimh  Send Email to jimh     
There should not be any interaction between the COM PORT on the Lowrance 525c and its operation as a chart plotter and GPS receiver, however, I suppose anything is possible.

When you interconnected the chart plotter-GPS unit to the radio, did you connect an NMEA-0183 OUTPUT from the radio to an INPUT on the chart plotter-GPS unit?

In The Red posted 09-09-2010 11:06 PM ET (US)     Profile for In The Red  Send Email to In The Red     
I would not have thought there would be any corelation between them either...
But yes, I connected one pair of wires.
The yellow "transmit" wire from the gps to the green "gps data in" wire on the radio.
And the "Shield Ground" on the gps to the "ground" on the radio.
jimh posted 09-10-2010 09:19 AM ET (US)     Profile for jimh  Send Email to jimh     
Thanks for the additional information. I was asking if you connected an OUTPUT from the radio to the INPUT on the chart plotter-GPS unit, and it appears you did not. I was thinking perhaps the radio was sending data to the chart plotter-GPS unit that was confusing it. Since you have no connection there, it could not.

The most reasonable explanation is the two events are simply coincidental. I cannot imagine that turning on the serial port data would cause the GPS receiver to stop functioning. Perhaps you can repeat the experiment, but this time do not actually connect the wiring to the radio. Just turn on the serial port data, and see if the GPS freezes again.

In The Red posted 09-10-2010 12:39 PM ET (US)     Profile for In The Red  Send Email to In The Red     
Sorry about that... I somehow missed that part of your question. No, there is no output connection to be had on this radio according to the schematics. Only a GPS input.
I will be heading up to the boat later today for the weekend and plan to mess with it some more. I'll give your suggestion a shot and let you know what happens!
Thanks for your input!
In The Red posted 09-12-2010 03:33 PM ET (US)     Profile for In The Red  Send Email to In The Red     
I have found that if I do not connect the radio to the gps, and I turn on the com port on the gps, this problem still exists. So apparently it has nothing to do with my wiring. I've rooted around in the menu settings and find nothing that appears to be something that might cause this. Then again I'm not certain what some of that stuff really is... :(
The other thing is, I now realize that the unit I have is the 520c, not the 525c. But from what I see in the manual (which is for both) this situation is the same for either one.
I'm stumped...
jimh posted 09-12-2010 03:36 PM ET (US)     Profile for jimh  Send Email to jimh     
Look for some sort of Master Reset function. Sometimes this information is not given in the user manual, but it often leaks out and gets posted on the internet. There may be some sort of key combination which when held down at start-up will cause the device to do a complete reset. This may provide a remedy. Back-up any stored data on the device, such as way points, routes, and trails, which you want to preserve. Try a GOOGLE search to see if a Master Reset exists for that device. I suspect there is one. Or thoroughly read the manual, it may be buried in there.

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