Received-SPF: pass
 receiver=logan.com; client-ip=208.104.2.25; envelope-from=jewen@comporium.net
From: <jewen@comporium.net>
Subject: Re: [FlyRotary] Re: EM-2 signals to an EFIS?
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Message-Id: <20080810212329.CBC02106@ms2.comporium.net>
Date: Sun, 10 Aug 2008 21:23:29 -0400 (EDT)

I certainly do not want to speak on Tracy's behalf.  But I can tell you, available from the EC-2 that RPM, MAP, Manifold Air Temp, Fuel Flow (Not certain of the formula to calculate raw data into engineering units, I believe Ed Anderson has some insight on FF calcs.)  From that data, HP should also be available by calculation (I presume the EM-2 is calculating HP.)  

The only requested item not available would be fuel levels. 

The EC-2 has a serial interface (thats how it communicates with the EM-2.  19000 baud, 8-N-1, data is provided in a polled fashion.  However; the level is CMOS (5 Volt.)  You can fabricate a converter (plenty of DIY info on the web) or purchase a converter Like B&B TTL Converter  MN 232LPTTL, to do the conversion to RS232 signal levels.

I built an interface between my P4 on board computer and the EC-2 using this serial data comms from the EC2 (MAP, MAT, FF, Staging point, timing advance, fuel map table, etc.)

Hope this helps,
Joe 

---- Original message ----
>Date: Sun, 10 Aug 2008 16:26:31 -0800
>From: "Al Gietzen" <ALVentures@cox.net>  
>Subject: [FlyRotary] Re: EM-2 signals to an EFIS?  
>To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
>
>OK; that's two of us. I asked about this about 3 years ago.  How many more
>EM2s are out there with the GRT EFIS, and when does it become economically
>feasible?
>
>AL G
>
>
>-----Original Message-----
>From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
>Behalf Of Phil White
>Sent: Sunday, August 10, 2008 12:56 PM
>To: Rotary motors in aircraft
>Subject: [FlyRotary] EM-2 signals to an EFIS?
>
>Tracy:     When ordering an EFIS from GRT at Oshkosh, I inquired about 
>whether their EFISes could show the engine figures (normally obtained 
>from their EIS unit) from the EM-2.   Todd indicated he had spoken to 
>you at some point about you providing to GRT the data sequence that the 
>EM-2 could provide, so they could write software to allow the EFIS to 
>show graphic engine status.
>
>    We don't want to give up the Auto-Tune features of the EM-2, but it 
>sure would help to be able to see RPM, MAP, fuel levels, % power on a 
>single screen with the flight info.
>
>    Is it a reasonable expectation that you may be able to provide the 
>needed info to GRT so they could display it?  In this lifetime? :-)
>
>Phil White, 20B headed to an RV-10
>
>--
>Homepage:  http://www.flyrotary.com/
>Archive and UnSub:
>http://mail.lancaironline.net:81/lists/flyrotary/List.html
>
>
>--
>Homepage:  http://www.flyrotary.com/
>Archive and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/List.html