Author Topic: nmea output don't work (Read 23114 times)

skacco · « **on:** April 30, 2012, 10:55:38 AM »

Hi guys...
I've work a lot without any results..
I've read forum but I'ven't find any solution..
I've a humminbird 798c SI and I've bought the AS HHGPS cable kit to use the nmea OUTPUT
I've tried a lot but I don't receive any NMEA data..
I used the white (OUT) and BLACK (GROUND) wire to connect.. but I cannot receive anything into VHF and into SMARTCRAFT..
Someone could help me?

Humminbird_Greg · « **Reply #1 on:** April 30, 2012, 01:22:57 PM »

skacco,
You mentioned that you have the 798c Si model unit. This unit will not output the NMEA 0183 data that you are wanting to use without the input of a GPS Receiver. Now if you instead have the 798ci Si model (has the “I” in the model number) than we are talking about something different here. I am assuming that you typed in the correct model number though. That AS-HHGPS cable is not needed. You need reconnect the external GPS Receiver and use the NMEA ‘pigtail’ wire to connect to your VHF radio (see image below).

Now I am making another assumption here: that you have the older GPS Receiver that has a Red, White and Black wire in its cable. To connect to the SmartCraft gauges you will need the AS-SysLink cable. Look below for directions on how to connect to your SnmartCraft gauges.

If you instead have the GPS Receiver that has the Green, White and Black wires; than you do not need the AS-SysLink cable and can make the connection to the SmartCraft gauges by using the Green and Black wires. You can also use the same Green/Black connections for the VHF radio or use the White/Black as before.

skacco · « **Reply #2 on:** April 30, 2012, 02:23:27 PM »

I have the ci model with internal GPS receiver and I have enabled nmea out in the menu..
The reseller sell that cable because I haven't any other wire to connect...
This cable has 4 wire red black white and green..
Could you help me please? I haven't understand where is the error..

Humminbird_Greg · « **Reply #3 on:** April 30, 2012, 02:45:20 PM »

The ci model makes a difference.
The AS-HHGPS is the cable that you are needing to use. For connection to the VHF radio you need to use the White and Black wires (White being NMEA Out and the Black wire is the NMEA Ground).

Unfortunately do to the NMEA sentence prefix restrictions of the SmartCraft gauges; there is no way I know of to use an internal GPS unit to output NMEA data to the SmartCraft gauges, that the SmartCraft gauges will accept and use.

skacco · « **Reply #4 on:** April 30, 2012, 03:20:04 PM »

Ohhh bad news? Why it doesn't work? Nmea is a standard..
Can I buy an external GPS antenna and plug it into the main unit to obtain the output?
Thank you very much for your help

sonar2000 · « **Reply #5 on:** April 30, 2012, 03:38:14 PM »

If the unit accepts an external antenna then the cable that come with the external will have two pigtails, like the ones Greg posted pictures of.
In this case you will get the nema sentence from the external and can act upon that signal.
Can you check and post the model type you have?
I dont think there is a 798c SI...but could be wrong..
The manual for the 798ci hd si shows a diagnostic screen indicating an external antenna. But the manual does not show a back view of the unit for connectors..
Chuck

skacco · « **Reply #6 on:** April 30, 2012, 04:16:22 PM »

I have the ci model and there is a plug for an external antenna..
What type of antenna should I need? And what cable?

sonar2000 · « **Reply #7 on:** April 30, 2012, 04:21:05 PM »

The latest external is the AS GR50 Part number 407480-1....
Not sure of the cable. If you do not go to the smartcraft then the AS HHGPS may be the one..
Say again what you intend on using the nema data to or connected to..
Chuck

Humminbird_Greg · « **Reply #8 on:** April 30, 2012, 04:35:25 PM »

Quote from: skacco on April 30, 2012, 03:20:04 PM

Ohhh bad news? Why it doesn't work? Nmea is a standard..
Can I buy an external GPS antenna and plug it into the main unit to obtain the output?
Thank you very much for your help

It does not work because, although NMEA 0183 is a communications standard it did not fully standardize the naming of the sentences. In this case the prefix for those NMEA sentences. As the attached images above explain: Humminbird uses a different NMEA sentence prefix than what the SmartCraft gauges will accept. The only way to get our units to work with the SmartCraft gauges is to use the direct NMEA data feed from the GPS Receiver. This can be done with the GPS Receiver pigtail wire if it is one of the newer ones (GR16 or GR50) that has the Green wire (not the Red wire). If it has the Red wire you would have to either use the AS-SysLink cable as I noted above or cut into the GPS Receiver cable (voiding any warranty). This cable change was made back in February of 2010.

Yes, the 798ci Si model can use an external GPS Receiver. Look for either the GR50 or GR16 GPS Receivers (AS-GR16, AS-GR50).

sonar2000 · « **Reply #9 on:** April 30, 2012, 04:46:17 PM »

greg, are you saying that if he puts a GR50 he can output to VHF. And that the smartcrafdt is the one that wont work..

chuck

Humminbird_Greg · « **Reply #10 on:** April 30, 2012, 04:49:09 PM »

Depending on which GR50 GPS Receiver he gets sonar2000 will determine how he can get the NMEA 0183 data out to each, but it can be done.

It can also be done with a GR16 GPS Receiver with the connections.

sonar2000 · « **Reply #11 on:** April 30, 2012, 04:56:44 PM »

confused again. the HB website shows only the AS GR50 as one unit.
What is the other GR50 that is available..

Chuck

Humminbird_Greg · « **Reply #12 on:** May 01, 2012, 09:11:46 AM »

sonar2000,
There is no other GR50 available.

Back in February of 2010 there was a change made to the cable we use on the GR16 and GR50 GPS Receivers. This was a change made to an existing product and not a new product. What was done was that the Red wire was removed as it was not really needed and represented a possible means for someone to damage their unit if they shorted it out or connected it to some device that needed more current than the circuitry connected to this wire could source. A Green wire was added in its place due to some products from other companies not being able to use the NMEA sentences that we output from our units (we use a “IN” prefix). These other products from other companies are looking for the “GP” prefix to the NMEA sentences. So to accommodate this we found it easier to add the Green wire which is a direct output from the GPS Receivers that we use.

We make changes to many of our products and accessories that are mostly transparent to our Customers. When we do so we do not offer these as a different version of model. The change to the GPS Receiver cable was one of these as it only affected that small percentage of Customers that use the NMEA output from our units.

Humminbird_Greg · « **Reply #13 on:** May 01, 2012, 11:29:35 AM »

muddy, perhaps my choice of words was wrong but the fact remains that most Customers don’t know what NMEA is or have a use for it. The wire color change was noted in the installations guide for the GPS Receivers. If the user read the directions they would have seen this though I doubt that any of them would know that it changed.

skacco · « **Reply #14 on:** May 03, 2012, 03:28:43 AM »

so do you confirm that I need only as-gr16 and no additional cable to get it work with smartcraft and vhf?
thank you very much

Humminbird_Greg · « **Reply #15 on:** May 03, 2012, 01:31:48 PM »

I don’t know skacco; what color wires are there under the black plastic cap on the end of the shorter NMEA pigtail wire that comes out of the GR16 connector?

If it is the Red, White and Black version of the cable; do you feel comfortable splicing into the GPS Receiver cable?

skacco · « **Reply #16 on:** May 03, 2012, 01:38:15 PM »

if there is the red wire I must to cut the connector
if there is the green wire I can use it
is it correct?

Humminbird_Greg · « **Reply #17 on:** May 03, 2012, 01:45:31 PM »

Yes.
(actually you would have to either cut the cable - not the connetor - or use the AS-SysLink cable as I originally showed).

striper · « **Reply #18 on:** July 19, 2012, 09:16:55 AM »

I,m trying to add GPS info to my smart gauge for fuel and speed data.
I have a 998c SI and a new GR50 antenna with the green wire, can I connect this to my LMF 400 smartgauge through my nmea 2000 network?
The nmea wires are red Net-S, black Net-C, white Net-H, blue Net-L and bare drain.
Also which 998c firmware version would I need?

Thanks,

Humminbird_Greg · « **Reply #19 on:** July 19, 2012, 11:43:08 AM »

striper, there is no NMEA 2000 output from the 998c Si unit or the GR50 GPS Receiver. The only way to do what you are wanting, since your gauges require an NMEA 200 input (if I understand this correctly), is to buy and connect the AS-ETH-NMEA2K accessory. This is basically an Ethernet to NMEA 2000 converter. The connection would be made from the Ethernet connector on the 998c Si unit to the ETH-NMEA2K accessory and from there to your NMEA 2000 network.

I am unfamiliar with the LMF 400, so if it can accept an NMEA 0183 signal; than yes connecting the Green and Black wires from the GR50 NMEA pigtail wire should work.

erocks4u · « **Reply #20 on:** July 21, 2012, 10:46:47 AM »

thanks for your info Greg, as now i know that i can use my gps receiver pigtail to my smartcraft to get rid of the dreaded pitot error, and have a more accurate speed.

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