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Technique for DSub Pin / data breakout for RPM issue

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plevyakh

Joined: 10 Jan 2011
Posts: 39

Posted: Tue Oct 13, 2015 7:01 am Post subject: Technique for DSub Pin / data breakout for RPM issue

Folks,

I've come across this a few times in the System Test and Flight test of my GlaStar.  Can you please share a technique you've used to break into a DSub connector pin and read the data going through that Pin/Wire?



Currently...I'm looking for something that will allow me to easily disconnect a DSub 15 and DSub25 connectors, insert the data Breakout board, and then read the data going through any Pin with a Voltmeter.



I found this on eBay, and it would work, but I'd have to also get a short pigtail connector to enable the connections due to space.

http://www.ebay.com/itm/DIN-Rail-Mount-D-SUB-Interface-Module-DSUB-Header-Breakout-Board-/191703597826?var=&hash=item2ca26cc302



Here's my recent flight test issue.   I have dual LightSpeed Ignition System Plasma IIIs.   The RPM sensor on Ignition #1 is working great!   I feed this into my Grand Rapids EIS4000 engine monitor and get reliable RPM readings.



My problem is with Lightspeed Ignition #2.   When I switch to Ign #2 only, my RPM goes to zero.   So either my Lightspeed #2 signal tach reading  voltage is bad, or my connection to to the EIS4000 engine monitor is bad.



I need to break into the Dsub 15 connector on the Lightspeed Ignition #2, and read Pin 6 (Signal Tach), and Pin 13 (Shield Ground) to confirm I'm getting 0V at idle, and 5V or higher at higher throttle settings.  If this checks good, then I'll have to break into the EIS4000 DSub 25 connector and check Pin 24 (Tach Input #2) and see if it's sensing a value.



Is there an easy way to break into a DSub and measure readings without having to pull apart the connector and patch in a test wire?



Thanks for your experience'd inputs!



Howard

GlaStar N19HL (flying and loving every minute!)

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_________________
Howard Plevyak
GlaStar / Cincinnati, Ohio

ARGOLDMAN(at)aol.com
Guest

Posted: Tue Oct 13, 2015 8:26 am Post subject: Technique for DSub Pin / data breakout for RPM issue

One thing I have found helpful is to make a "jumper/diagnoser cable.

  

 Use a flat ribbon cable (much longer than you think that you need) and  get several press-on sub d-s of both genders in vairous sizes (obviously  the largest one (probably a 25 pin)) but also 15 and 9 pin ones. Be careful to  keep the proper pin alignment as these press on things do not indicate pin 1.  Start with a 25 pin male, a few inches down put a 25 pin  female (again  ascertain that pin 1 is correct then a few inches down put a 15 pin male then a  15 pin female and then a 9 pin male and female. if you want to use only 1 size  use that size only. now in the middle just put a male plug (of each size for  ease). At the other end of the wire put the same arrangement of plugs that  you originally used in the beginning of the harness.

  

 What you now have is a jumper cable, usable for 3 or more sizes of sub-ds  with a male (pins exposed) sub-d in the middle( or males of vaarious sizes)--  remember that the pin numbers (over 5, I believe) will be different as  the d-subs get larger-- .

  

 

With this cable, you can do invivo studies (all systems connected).  this jumper cable can be used for many other things. Since I have a Cozy with  rotary engine, I use tit to verify 9, 15 and 25 pin sub-ds from the IP to the  FW.

  

 Just don't run over the cable with a chair (Don't ask me how I know the  damage that causes.)

  

 Good luck  (did I say  make sure that the pins are on the  appropriate wires[img]http://cdn-cf.aol.com/se/smi/0201d20638/16[/img]

  

 Rich

  

  In a message dated 10/13/2015 10:10:07 A.M. Central Daylight Time,  hplevyak(at)mac.com writes:

  	  Quote: 	
		  -->    AeroElectric-List message posted by: "plevyakh"    <hplevyak(at)mac.com>



Folks,

I've come across this a few times in    the System Test and Flight test of my GlaStar.  Can you please share a    technique you've used to break into a DSub connector pin and read the data    going through that Pin/Wire?



Currently...I'm looking for something that    will allow me to easily disconnect a DSub 15 and DSub25 connectors, insert the    data Breakout board, and then read the data going through any Pin with a    Voltmeter.



I found this on eBay, and it would work, but I'd have to    also get a short pigtail connector to enable the connections due to    space.

http://www.ebay.com/itm/DIN-Rail-Mount-D-SUB-Interface-Module-DSUB-Header-Breakout-Board-/191703597826?var=&hash=item2ca26cc302



Here's    my recent flight test issue.   I have dual LightSpeed Ignition    System Plasma IIIs.   The RPM sensor on Ignition #1 is working    great!   I feed this into my Grand Rapids EIS4000 engine monitor and    get reliable RPM readings.



My problem is with Lightspeed Ignition    #2.   When I switch to Ign #2 only, my RPM goes to zero.      So either my Lightspeed #2 signal tach reading  voltage is bad, or my    connection to to the EIS4000 engine monitor is bad.



I need to break    into the Dsub 15 connector on the Lightspeed Ignition #2, and read Pin 6    (Signal Tach), and Pin 13 (Shield Ground) to confirm I'm getting 0V at idle,    and 5V or higher at higher throttle settings.  If this checks good, then    I'll have to break into the EIS4000 DSub 25 connector and check Pin 24 (Tach    Input #2) and see if it's sensing a value.



Is there an easy way to    break into a DSub and measure readings without having to pull apart the    connector and patch in a test wire?



Thanks for your experience'd    inputs!



Howard

GlaStar N19HL (flying and loving every    minute!)



--------

Howard Plevyak

GlaStar / North Bend,    Ohio

hplevyak(at)mac.com





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