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Reverse Engineering JPI Engine Monitor Interfaces

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email(at)jaredyates.com
Guest

Posted: Tue Jan 11, 2022 6:37 pm Post subject: Reverse Engineering JPI Engine Monitor Interfaces

I have purchased a plane that came with an old JPI EDM-700 engine monitor. This is the one with the orange and black display that shows bar graphs for EGT, CHT, etc. It has a data logging capability, but the interface requires their cable, which I don't have:https://www.jpinstruments.com/shop/pc-interface-cable-for-edm-700-edm-800-and-edm-760/



This looks like something that I could make out of things I have laying around the shop, vs spending $40 plus shipping. Does anyone have one sitting around that they could do some continuity testing on? If the little plug only has two conductors, I would guess that there must be two pins on the serial end that they are connected to.

JPI also offers a box that takes the serial from that cable and writes to a USB drive. They charge $200 for that box, and I'd love to see what's in one of those. 

Another option is to send the unit into JPI, where they will modify it to have a USB interface for $300.

And of course there is always the option of just pretending like it doesn't record data, but where's the fun in that?

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user9253

Joined: 28 Mar 2008
Posts: 1926
Location: Riley TWP Michigan

Posted: Wed Jan 12, 2022 7:24 am Post subject: Re: Reverse Engineering JPI Engine Monitor Interfaces

Buy a USB-Serial converter.  Research them to get the best chipset.

eBay has converters with a terminal strip for attaching wires.

Connect two wires from the DC plug to the USB-Serial converter.

Nine pin D-Subs are not required.

I have never actually done this.  So I don't know if it will work or not.

But if it works, it will only cost you $10 instead of $300.

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_________________
Joe Gores

cjfortin

Joined: 05 Jan 2013
Posts: 5

Posted: Wed Jan 12, 2022 7:53 am Post subject: Re: Reverse Engineering JPI Engine Monitor Interfaces

If it is a standard RS232 connection, pins 2 & 3 are your transmit and receive signals.

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email(at)jaredyates.com
Guest

Posted: Wed Jan 12, 2022 9:21 am Post subject: Reverse Engineering JPI Engine Monitor Interfaces

Thanks Joe, I was starting to think the same thing. Seems like a lot of doing then un-doing that could be skipped, when all we're really after is a tx and an rx.



On Wed, Jan 12, 2022 at 10:31 AM user9253 <fransew(at)gmail.com (fransew(at)gmail.com)> wrote:



 	  Quote: 	
		  --> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com (fransew(at)gmail.com)>

 

 Buy a USB-Serial converter.  Research them to get the best chipset.

 eBay has converters with a terminal strip for attaching wires.

 Connect two wires from the DC plug to the USB-Serial converter.

 Nine pin D-Subs are not required.

 I have never actually done this.  So I don't know if it will work or not.

 But if it works, it will only cost you $10 instead of $300.

 

 --------

 Joe Gores

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=505670#505670

 

 

 

 

 

 

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Peter(at)sportingaero.com
Guest

Posted: Sun Jan 16, 2022 2:37 am Post subject: Reverse Engineering JPI Engine Monitor Interfaces

From what I remember from an aeroplane I sold 15 years ago this is a straight RS 232 interface but the serial to USB converter is key, not all work. Don’t forget to switch the Rx & Tx pins on the way to the computer. I believe it is only a 2 wire interface, so I’m guessing the Rx (3) and Gnd (5) pins (at the computer end) are connected?

 

See also https://mooneyspace.com/topic/35740-jpi-700-cell-phone-serial-data-cable/

 

From: owner-aeroelectric-list-server(at)matronics.com <owner-aeroelectric-list-server(at)matronics.com> On Behalf Of Jared Yates

Sent: 12 January 2022 02:36

To: aeroelectric-list(at)matronics.com

Subject: Reverse Engineering JPI Engine Monitor Interfaces



 

I have purchased a plane that came with an old JPI EDM-700 engine monitor. This is the one with the orange and black display that shows bar graphs for EGT, CHT, etc. It has a data logging capability, but the interface requires their cable, which I don't have:

https://www.jpinstruments.com/shop/pc-interface-cable-for-edm-700-edm-800-and-edm-760/



This looks like something that I could make out of things I have laying around the shop, vs spending $40 plus shipping. Does anyone have one sitting around that they could do some continuity testing on? If the little plug only has two conductors, I would guess that there must be two pins on the serial end that they are connected to.



JPI also offers a box that takes the serial from that cable and writes to a USB drive. They charge $200 for that box, and I'd love to see what's in one of those. 



Another option is to send the unit into JPI, where they will modify it to have a USB interface for $300.



And of course there is always the option of just pretending like it doesn't record data, but where's the fun in that?

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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