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Whenever things are intermittent like this it usually means there is a connection problem. Obviously I can't tell you where it is but things like bad crimps, butt splices improperly done, cold solder joints, loose connectors, corroded contacts, etc can do it. Of course there is the possibility that the EC2 or EM2 serial channels are intermittient but that is a rare thing. They usually either work or are dead.
BTW, you do have power to both units when you see NOP? If the EC2 is off, you will see NOP on the EM2.
Tracy (only 1204 more emails to review)
From: "Christopher Barber" <CBarber@TexasAttorney.net>
Reply-To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: EM2 NOP flashing w/RPM and a couple of other questions
Date: Sun, 15 Jul 2007 21:23:51 -0500
Yeah, I think the NOP issue is poised to drive me crazy. I checked the grounds and serial connections todayand all checked ok, hooked it all back up and low and behold NO Flashing. Taxi'ed the plane for the first time for a few minutes (really fun). Taxi'ed back to the hangar and started to run the Auto Program with what seemed to be some succes and got about a third the way through when I started to worry about the engine getting too hot (I wish the H2O temp was displayed in the program mode), so I shut down Auto Program and the H2O was reading 233, so I am glad I shut down.
Let it cool a bit and started to restart and NOW the dang thing was flashing between NOP and the tach reading again. GEEEESH.
Chris
BTW, did I mention I TAXI'ED for the first time today <g>
----- Original Message -----
From: Tracy Crook
To: Rotary motors in aircraft
Sent: Sunday, July 15, 2007 4:21 PM
Subject: [FlyRotary] Re: EM2 NOP flashing w/RPM and a couple of other questions
Hi all, finally back from CO where we finally got the cabin plumbing OKed by the inspector (and got the thing basically finished).
Tom is correct, NOP means Non Operational or Inoperative. In this case it means the EC2 is not commuicating with the EM2. Either the two serial wires between them are not connected properly or an ungrounded condition or wiring error has blown one of the serial connections. The Auto Program mode will not work in this condition.
Tracy (still bleary after non-stop drive from Colorado)
On 7/14/07, thomas walter <roundrocktom@yahoo.com> wrote:
Tracy will have the final say, as he wrote the code, but most likely:
NOP = No Operation. or Non Operational. Uh for the life of me I can not recall when I started using that notation, but if you flag part of a schematic, or assembly code, with NOP it is pretty universal comment among geeks (EE's).
At least it isn't flashing "Fubar". :) Once I "inherited" some assembly code on a project which had never been commented (debug/maintenance nightmare). Thankfully the previous engineer had a hard copy with his hand written Chinese notation along side the code. Excited as I started to recognize a pattern of hand written characters by the sections of code I couldn't figure out. Thankfully another engineer explained what "fubar" looked like in Chinese.
Tom
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