5 Minute Jobs DSC/Nmea

I

ians

Well-Known Member
Joined
22 Oct 2001
Messages
645
Location
up north
Visit site
Morning All

Arghhhhhhhhhhh
Ok it takes me 30 minutes to remove old Simrad Vhf and replace with New RS87 DSC radio, pretty chuffed with myself, done a nice neat job.
Last step wire the Nmea cable in to get position fix on VHF.
System is Furuno GP1650W Gps Plotter, Linked to ST7000 autopilot and Furuno Radar.
Nmea cables from GPS are nmea white + and black nmea -
am I right that the Nmea white + from GPS should go to the nmea nmea + on the vhf.
this is how I read it in the manual , but could not get it to work.
went into the GPs and set the output sentences to GLL,RMC and ZDA as this is whats required in the Simrad manual.
Tried disconnecting the Autopiliot and radar so there was just the GPS connected direct to the VHF, still no postiion fix on the vhf

Is there anything basic or something Im missing here ?

Any help please

cheers

ians
 
You need to connect the NMEA- leads from both the radio and the GPS together as well. This is normally done by connecting them to earth. If there is not an NMEA- lead then it is aleady connected to earth inside the equipment.

I assume you are connecting the NMEA OUT from the GPS to the NMEA IN on the radio (I am not familiar with your kit, so don't know what the colours are)
John
 
Connect both plus to plus and minus to minus. You may also have to set up the baud rate (bit rate) and other port parameters typically:
4800 b/s (but could 9600 b/s)
1 stop bit
No parity

but check in the manuals, both transmitter and receiver should be the same set up.

Alan.
 
John
Thanks for reply


Whats confusing me is the connections on the Simrad VHF
they are
Nmea/idsc
1 COMMON OUT -
2 COMMON OUT +
3 iDSC -
4 iDSC +

Now the manual I got with the radio says connect nmea - and + cable to the iDSC connectors. now I also downloded a manual from simrads web site and that is differant and says connect to Nmea 1 and 2

does this make any more sence

ians
 
I would say you need to connect it to the iDSC + & - ... makes no sense connecting it to the common out ... I guess that could be the radio transmitting DSC info to a compatable CP ...
 
Thanks fireball

The manuals just realy confuse things, it read tmore that the iDSC were for use if you had other Simrad like there cps/plotted connected, and data would pop up on the CP screen if you had a dsc call.
Will try connecting it this way this evening.

Thanks again for your help

ian
 
From the manual:
7.2.7 NMEA 0183 input
The inbuilt NMEA 0183 processor allows navigational position
information to be received from a GPS or chartplotter. The
boat’s position is automatically transmitted when a Distress
Alert is initiated.
NMEA input must be of the 0183 format, versions 2.0–3.0, outputting
sentences GLL, RMC, and ZDA at a Baud rate of 4800.
The NMEA Out connections from the GPS/plotter should be
connected to the “NMEA In” terminals as shown (Fig 7.12).

------------------------------------------------------------------

Sorry but the diagram didn't copy!!
But the input terminals to use are :

Terminal Number Wire Reference
1 Common Out -
2 Data Out +

See paragraph 7.2.7 of manual which you can download from website.
Strange terminology for input signals .......... but that's what it says!!
Alan.
 
Alan
Thanks for taking the time to do that.

So would the nmea + from gps go to the 2 Data Out + on the VHF
+ connected to + and - connected to -

Cheers
ians
 
Accoring to the drawing the terminals on the VHF are labelled:
NMEA -
NMEA +

which corresponds to their description:
Terminal 1 : Common out -
Terminal 2 : Data Out +

So, your GPS out + should go to terminal 2 and your GPS minus to terminal 1.
Have a look at the drawing and it will all become clear!!! Definitely not the iDSC connections.
You can get the dwonload from:

http://www.simrad-yachting.com/en/Produc...stem/Downloads/

Alan.
 
I've just bought a simrad dsc rd68 radio, I found the diagram of connecting the NMEA cable not too clear, it gives the impression that the *radio* is giving out an MNEA signal, however on your set section 3.3.7.1 indicates that you have to select your data source, having said that I'm useless with instructions. Good luck
 
Just a big quick thank you to all that replied and helped.
Up and running and working now.

Thanks for your help

/forums/images/graemlins/smile.gif /forums/images/graemlins/grin.gif
Ians
 
Good to know that you are up and running. I once did a course on RS232C (similar to NMEA) and the instructor said that the RS232 standard was the most abused data standard in the world ....... but I reckon NMEA runs a close second!!!! NMEA 2000 will rsolve all the problems .................. I don't think ................ but at least the physical level connection will be unique (easier????).

Alan.
 
You must log in or register to reply here.

Share this page

Top