JPI Edm 830

Tan

Tan

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TheCapTan
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In my Piper arrow my 830 is connected to my gtn 650xi. Since day 1 I haven’t been able to get the Ground speed and fuel required to waypoint or destination to show any information. When I pull data logs it does shows gps coordinates and ground speeds. My last visit to a shop they verified the settings were correct but it was only a software update for my gtn as they were booked. Ff uodates to 650 accurately. Could this be a pin issue ?
 
Tan said:
In my Piper arrow my 830 is connected to my gtn 650xi. Since day 1 I haven’t been able to get the Ground speed and fuel required to waypoint or destination to show any information. When I pull data logs it does shows gps coordinates and ground speeds. My last visit to a shop they verified the settings were correct but it was only a software update for my gtn as they were booked. Ff uodates to 650 accurately. Could this be a pin issue ?
Click to expand...
I had the same issue with my 750. It's the protocol, the manual is wrong. Set the GTN to FADC format 1.
EDIT TO ADD:
If the EDM 830 GPS-C is set to 1 then the GTN is set to Fuel Format 2. If the EDM 830 GPS-C is set to 6 or 7 then the GTN is set to FADC Format 1.
 
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Joe_B1 said:
I had the same issue with my 750. It's the protocol, the manual is wrong. Set the GTN to FADC format 1.
EDIT TO ADD:
If the EDM 830 GPS-C is set to 1 then the GTN is set to Fuel Format 2. If the EDM 830 GPS-C is set to 6 or 7 then the GTN is set to FADC Format 1.
Click to expand...

how do you find the GPS setting on the 830?
 
CT583 said:
how do you find the GPS setting on the 830?
Click to expand...
Going from memory here but the way it works is that the EDM is smart enough to determine the protocol coming from the GTN. The GTN must be set up to the correct protocol. The way to get into the menu for the EDM is hold both buttons to get into the programming mode and then tap step to get into the protocol page. See pages 59 and 62 in the EDM pilots guide.

Set the EDM data format to mode 1 (Garmin) then go into the GTN config page and set the format to Fuel Format 2. I believe there are 4 options. My plane also has a 530W so I set mine to FADC.
 
Joe_B1 said:
Going from memory here

Set the EDM data format to mode 1 (Garmin) then go into the GTN config page and set the format to Fuel Format 2. I believe there are 4 options. My plane also has a 530W so I set mine to FADC.
Click to expand...

thank you very much. I’ll try this tomorrow.
 
CT583 said:
thank you very much. I’ll try this tomorrow.
Click to expand...
I hope it works for you. Once we decided that the protocol was wrong, there are only a few options in the GTN menu, we just tried all 4 until we found the one that worked. Once you find the correct one, the GPH field will change from dashes to 0.0 GPH.

FROM THE EDM MANUAL:

The EDM sends formatted data to the GPS relating to fuel flow. This format must be selected in Pilot Program Mode to match what the GPS expects to receive. The table below depicts the available EDM choices: GPS-C Fuel Flow Format for GPS Bi-directional Comm Data OUT OF EDM → INTO GPS GPS-C Description
0 No fuel data output
1 Garmin (Shadin Miniflow format)
2 Allied Signal (format B) “To waypoint only”
3 Arnav/EI Signal Format
4 Allied Signal (format C) *
5 (Not used)
6 Garmin 430/530 GNX-80/GX-60 “To waypoint only”
7 Garmin 430/530 GNX-80/GX-60 “To Destination only”
8 Allied Signal (format B) “To Destination only”
 
Tan said:
In my Piper arrow my 830 is connected to my gtn 650xi. Since day 1 I haven’t been able to get the Ground speed and fuel required to waypoint or destination to show any information. When I pull data logs it does shows gps coordinates and ground speeds. My last visit to a shop they verified the settings were correct but it was only a software update for my gtn as they were booked. Ff uodates to 650 accurately. Could this be a pin issue ?
Click to expand...
Are you trying to get it to show up on the GTN? Or on the JPI?
 
asicer said:
Are you trying to get it to show up on the GTN? Or on the JPI?
Click to expand...

IM trying to get it show on the EDM. So as of right now, Fuel Quantity gets updated from the 830 to my Gtn. I know they are both communicating. One shop set it up for me but when I flew home the Gps feature still was not working correctly. It sort of did one time but often times it says no GPS signal but the data logs shows otherwise. All other gauges on the 830 work great.
 
Joe_B1 said:
I hope it works for you. Once we decided that the protocol was wrong, there are only a few options in the GTN menu, we just tried all 4 until we found the one that worked. Once you find the correct one, the GPH field will change from dashes to 0.0 GPH.

FROM THE EDM MANUAL:

The EDM sends formatted data to the GPS relating to fuel flow. This format must be selected in Pilot Program Mode to match what the GPS expects to receive. The table below depicts the available EDM choices: GPS-C Fuel Flow Format for GPS Bi-directional Comm Data OUT OF EDM → INTO GPS GPS-C Description
0 No fuel data output
1 Garmin (Shadin Miniflow format)
2 Allied Signal (format B) “To waypoint only”
3 Arnav/EI Signal Format
4 Allied Signal (format C) *
5 (Not used)
6 Garmin 430/530 GNX-80/GX-60 “To waypoint only”
7 Garmin 430/530 GNX-80/GX-60 “To Destination only”
8 Allied Signal (format B) “To Destination only”
Click to expand...


My fuel quality updates correctly from the 830 to my gtn. Ex. when I refuel and reset the fuel to full tank the gtn updates as well.
 
Have you called the shop that installed it. They should be the ones fixing it.
 
TommyG said:
Have you called the shop that installed it. They should be the ones fixing it.
Click to expand...

I tried a couple times after install to get a hold of them. Their customer service is trash after I paid them 47k for my install. Won’t ever deal with them again or ever recommend them.
 
Tan said:
I tried a couple times after install to get a hold of them. Their customer service is trash after I paid them 47k for my install. Won’t ever deal with them again or ever recommend them.
Click to expand...

Oh wow, for that money you paid I would be very ****ed.
 
TommyG said:
Oh wow, for that money you paid I would be very ****ed.
Click to expand...
Oh believe me. I would never recommend them. I had to straighten out all the squawks in my own.
 
It sounds like the output on the Agar in is set wrong. Set it to Aviation Format 1 and see if that works.
 
Joe_B1 said:
I had the same issue with my 750. It's the protocol, the manual is wrong. Set the GTN to FADC format 1.
EDIT TO ADD:
If the EDM 830 GPS-C is set to 1 then the GTN is set to Fuel Format 2. If the EDM 830 GPS-C is set to 6 or 7 then the GTN is set to FADC Format 1.
Click to expand...


My input is fuel format 2
And output is aviation output 2
 
Tan said:
My input is fuel format 2
And output is aviation output 2
Click to expand...

Your output on the GTN should definitely be aviation format 1, and I personally always set them up as input FADC Format 1 with the EDM’s GPS-C set to 7 (fuel to destination).

However, the only difference that I know of between aviation output 2 and 1 that I’m aware of though is that 2 lacks altitude. So while it’s nice to have the EDM recording the value, it shouldn’t impact the ability of the EDM to display the GS, REQ and such fields…. I’d suggest changing the output format on the EDM, and the input format on the GTN and see what happens. Since you are getting lat/long in the EDM logs, it must be getting the GTN output. It would make sense that it “can’t” display a value for REQ and such if the format isn’t set right as it doesn’t know to where it should be displaying it.
 
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If you have ever updated your firmware for the 830, it creates a lot of changes to the configuration procedure and JPI does not document those changes. It is best to call JPI support and ask for their "cheat sheet" for setup. They also said that they would walk me through the process if I phoned them while at the plane.
 
Tan said:
What setup do you have?
Click to expand...

GTN 650-JPI 900.

I remember having to change it to get OAT sent to 650 so when I go to TAS page, everything is filled in. But never had a problem with fuel calculations. So if you don’t have OAT probe, protocol will be different on IN.
 
MooneyDriver78 said:
GTN 650-JPI 900.

I remember having to change it to get OAT sent to 650 so when I go to TAS page, everything is filled in. But never had a problem with fuel calculations. So if you don’t have OAT probe, protocol will be different on IN.
Click to expand...

I have an Oat temp too but also the gad 13 for my G5. so I get temps from the 830 and my G5s.
 
@Tan Did you ever get the Fuel Required for next waypoint or destination to work? If so, what worked?
 
I am having similar issue with a Garmin GNX-375 and the JPI EDM-830. So much for "Standards" based commo.
 
Steve Flangan said:
I am having similar issue with a Garmin GNX-375 and the JPI EDM-830. So much for "Standards" based commo.
Click to expand...

The two units are communicating as fuel galleons update but that’s it.
 
Steve Flangan said:
I am having similar issue with a Garmin GNX-375 and the JPI EDM-830. So much for "Standards" based commo.
Click to expand...

The 2" navigators (GPS175/GNC355/GNX375) don't support the same RS232 formats that the GNS and GTN units do, and as such they don't currently support receiving fuel data. This is theoretically something Garmin could add in a future software update, but not supported currently.
 
Tan said:
still doesn’t work
Click to expand...

Would love to see the configuration settings on both devices, so strange that yours isn't working fully. Could you post the contents of the Settings.txt file that the EDM write to the USB stick when you download the flights? As well as a picture of the RS232 settings on the GTN?
 
What shop did you use that you wouldn't recommend?
 
Tan said:
The two units are communicating as fuel galleons update but that’s it.
Click to expand...

@Tan The Fuel Gallons (GPH) comes from the JPI Fuel Transducer, I don't believe it has anything to do with any inputs from the GPS.

My shop tried several iterations on JPI and GPS and in now works for me. Here is what I have that works:
  • JPI - GPS Format: #6: GNS 430/530-WP
  • Garmin GNX-375 - RS-232 Interfaces:
    • Port 2: Aviation Output 1 (for the JPI)
BTW - on the ground, 3 of the side channels on the JPI were X'ed out: 1- H:M, 2 - REQ, and 3 -RES. EXCEPT - on my GNX-375 there is the initial test mode on Power Up, first it confirms Databases (I press Continue), then it goes into a mode to confirm the CDI gauge - in my case i have a G5 DG/HSI, so I can verify the indicator shows what the GPS has. At this point, these 3 X'ed out JPI channels display info and let you know the GPS and JPI are talking on these channels. Once I press Continue again to leave test mode, the JPI then X'es out those 3 channels again.

The 3 X'ed out channels require the plane to be in motion to calculate Time to Waypoint - assume it get GPH (from JPI fuel flow transducer) and Time to waypoint (from GPS) to calculate, If the Time part is Zero - dividing by 0 gives Infinity, so the JPI just X'es out as it can't calculate what to display. Once airborne, the GPS calculates a Time to Waypoint and these 3 Channels come alive on the jPI.

Let us know if you can get yours to work
 
Last edited:
Steve Flangan said:
@Tan The Fuel Gallons (GPH) comes from the JPI Fuel Transducer, I don't believe it has anything to do with any inputs from the GPS.

My shop tried several iterations on JPI and GPS and in now works for me. Here is what I have that works:
  • JPI - GPS Format: #6: GNS 430/530-WP
  • Garmin GNX-375 - RS-232 Interfaces:
    • Port 2: Aviation Output 1 (for the JPI)
BTW - on the ground, 3 of the side channels on the JPI were X'ed out: 1- H:M, 2 - REQ, and 3 -RES. EXCEPT - on my GNX-375 there is the initial test mode on Power Up, first it confirms Databases (I press Continue), then it goes into a mode to confirm the CDI gauge - in my case i have a G5 DG/HSI, so I can verify the indicator shows what the GPS has. At this point, these 3 X'ed out JPI channels display info and let you know the GPS and JPI are talking on these channels. Once I press Continue again to leave test mode, the JPI then X'es out those 3 channels again.

The 3 X'ed out channels require the plane to be in motion to calculate Time to Waypoint - assume it get GPH (from JPI fuel flow transducer) and Time to waypoint (from GPS) to calculate, If the Time part is Zero - dividing by 0 gives Infinity, so the JPI just X'es out as it can't calculate what to display. Once airborne, the GPS calculates a Time to Waypoint and these 3 Channels come alive on the jPI.

Let us know if you can get yours to work
Click to expand...

Ive tried FADC INPUT and Aviation output 1 and that didn't work. Thats from anther plane with almost the same setup. Dual G5s with Gad 13. HE also has an EDM 830. I had to change it back as it wasn't giving me fuel updates to the GTN.
 
Steve Flangan said:
@Tan The Fuel Gallons (GPH) comes from the JPI Fuel Transducer, I don't believe it has anything to do with any inputs from the GPS.

My shop tried several iterations on JPI and GPS and in now works for me. Here is what I have that works:
  • JPI - GPS Format: #6: GNS 430/530-WP
  • Garmin GNX-375 - RS-232 Interfaces:
    • Port 2: Aviation Output 1 (for the JPI)
BTW - on the ground, 3 of the side channels on the JPI were X'ed out: 1- H:M, 2 - REQ, and 3 -RES. EXCEPT - on my GNX-375 there is the initial test mode on Power Up, first it confirms Databases (I press Continue), then it goes into a mode to confirm the CDI gauge - in my case i have a G5 DG/HSI, so I can verify the indicator shows what the GPS has. At this point, these 3 X'ed out JPI channels display info and let you know the GPS and JPI are talking on these channels. Once I press Continue again to leave test mode, the JPI then X'es out those 3 channels again.

The 3 X'ed out channels require the plane to be in motion to calculate Time to Waypoint - assume it get GPH (from JPI fuel flow transducer) and Time to waypoint (from GPS) to calculate, If the Time part is Zero - dividing by 0 gives Infinity, so the JPI just X'es out as it can't calculate what to display. Once airborne, the GPS calculates a Time to Waypoint and these 3 Channels come alive on the jPI.

Let us know if you can get yours to work
Click to expand...


I had ifr check and he checked my settings. Still can’t get any info on the edm 830. So far all I get is fuel update on my gtn 650 xi. It will update gallons.
 
@Tan
Hi Tan, I see back in 2022 you wrote about your EDM 830 install and not getting reliable fuel to destination showing up on the JPI EDM 830. Has that been resolved?

We have a Garmin GNS 430 GPS and just put in an EDM 830 and are having the exact same issue you were.

Did you ever get it resolved? JPI is now suggesting we get the unit replaced (it's brand new). Would love to know any learnings you have. Hopefully yours is working by now.

Thanks,
Jay
 
Jay, what kind of issues are you seeing? What GPS-C setting do you have set on the EDM, and what RS-232 settings do you have set on the GNS 430?
 
@Ryan Klems Thanks. The main issue is fuel to destination isn’t showing up reliably on the 830 even though it shows up on the 430. It’s intermittent. More details: When downloading the 830 data (and verified on the unit), sometimes groundspeed doesn’t show up on the 830 data and I’m seeing a NO GPS DEST (even though satellite coverage is good, and it’s showing ground speed on the 430). The 830 is programmed to fuel to destination and there’s always been an active flight plan in the 430. The fuel flow and fuel quantity correctly goes from the 830 into the 430. But the groundspeed and flight plan data seems to be intermittent into the 830. I saw Tan had this exact issue. I see the error NO GPS DEST on the 830 and the red X on the fuel needed to destination. Before the 830, the Insight 602 gave fuel to destination so the 430 data stream clearly works. And all the wires were checked. And the GPS settings were confirmed by the avionics shop. So just left puzzled and JPI is now suggesting to send in the unit. To your questions, I don’t remember the exactly GPS input / output settings but the avionics shop confirmed them and a) the fuel total and fuel flow from the 830 correctly goes to the 430 and b) the fuel to destination worked before to be sent from the 430 to our old engine monitor. Hope that helps explain it better.

Jay
 
jaybird27 said:
@Ryan Klems Thanks. The main issue is fuel to destination isn’t showing up reliably on the 830 even though it shows up on the 430. It’s intermittent. More details: When downloading the 830 data (and verified on the unit), sometimes groundspeed doesn’t show up on the 830 data and I’m seeing a NO GPS DEST (even though satellite coverage is good, and it’s showing ground speed on the 430). The 830 is programmed to fuel to destination and there’s always been an active flight plan in the 430. The fuel flow and fuel quantity correctly goes from the 830 into the 430. But the groundspeed and flight plan data seems to be intermittent into the 830. I saw Tan had this exact issue. I see the error NO GPS DEST on the 830 and the red X on the fuel needed to destination. Before the 830, the Insight 602 gave fuel to destination so the 430 data stream clearly works. And all the wires were checked. And the GPS settings were confirmed by the avionics shop. So just left puzzled and JPI is now suggesting to send in the unit. To your questions, I don’t remember the exactly GPS input / output settings but the avionics shop confirmed them and a) the fuel total and fuel flow from the 830 correctly goes to the 430 and b) the fuel to destination worked before to be sent from the 430 to our old engine monitor. Hope that helps explain it better.

Jay
Click to expand...
This is what solved my problem and it took 4 years but it was simple. After install I knew that the 830 was connected properly because fuel would update from the 830 to gtn 650. I called JPI to give them another shot 4 years later and the issue was my firmware. Something jpi never asked and my unit was new. Their tech sent me a new firmware update and it fixed the problem and what stood out was there was now an option that allows me to select baud rate of 9600. Once I saw that I knew it would work and it did. The firmware also caused a cal error but I finally was able to get fuel to destination to work. Afterwords jpi and to send me a new unit cause of the cal error but the firmware it was fixed it. Also the baud rate options were not in the manual since they don’t update them.
 
Thanks so much @Tan So sounds like a combination of a firmware / software update (I’m assuming that fixed it early in 2025, is that right?) and then ultimately a new unit for a cal (calibration error?) showing up on the 830 solved it fully. JPI did ask about the software version number on a recent support inquiry. And we do see the 9600 setting which is selected. I’m curious on JPI’s quality assurance process. Certainly the number of GPS units must complicate that process. In my mind, there must be an output file from the JPI to any GPS which has the data for fuel needed to destination. And it should be pretty simple to check if it either has that correctly or if it doesn’t. And it would be great if there was a way to check that without sending the unit back. Appreciate your help.

Jay
 
Tan said:
This is what solved my problem and it took 4 years but it was simple.
Click to expand...
Congrats on getting it figured out. I need to order the EIS install next month, and one of the things in the equation is "how well will it play with others?".

Love or hate Garmin, a Garmin widget seems to have less issues with other Garmins; probably by design. There's good and bad to that. Might work better, less issues, but it constrains your choices. A full Garmin panel that you end up with might be great today, but someday it will be like an entire Collins or Bendix King panel - outdated, no longer developed, and need to replace it all. Everything is a trade off.
 
JPI stuff used to work quite well with all the Garmin stuff when using the right formats. Sometime in the last few years, I started to see some issues. Have had trouble with a couple 900 and 930s that would work, but then lose the settings, and would work again once reset (until it lost them again), firmware updates fixed that. So if @jaybird27's unit is newer, definitely could need a firmware update (or perhaps worst case, need to go back for some internal changes). I have seen through posts on other forums that JPI mentioned in dealing with whatever issues they were having that replacing some of the chips used in their design as the older stuff obsoleted out caused some unforeseen issues that has taken some time to be tracked down and sorted out.
 
That’s frustrating. Our 730 and GTN650 works great. I could see what the settings are
 
I got to these posts as I was trying to get an EDM830 working with a KLN94.
The KLN was reporting RS232 errors.
I connected ground power and then started stepping through the settings, after a few steps I got the right combination to stop the RS232 errors.
The plane needs to be moving to get meaningful data.
FYI, this is what worked for the on the 830 for the KLN:
GPS BAUD RATE #3: 9600
GPS INPUT #3: AVIATION / BENDIX
GPS OUTPUT #3: Arnav/EI fuel data

Eugene
 
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