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GTX327 power switching

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Erich_Weaver(at)URSCorp.c
Guest

Posted: Wed Nov 01, 2006 9:35 am Post subject: GTX327 power switching

When ordering my avionics, I noted which units had integrated power

switches and which did not, so I could include power switches for those

that didnt on my panel.  For example, the GRT EFIS  does not have a power

switch, so I installed one on the panel.  The GTX 327 transponder does have

a power switch, so I did not include a switch for that.  However, after

cutting my panel, installing the avionics and proceeding to flip various

switches to see that everything lights up, I have discovered that the GTX

327 comes on when I turn on the master, regardless of whether I turned the

unit off the last time I used it.  So, if I want the unit off before engine

start, I will have to reach up and turn it off, when in my mind at least,

it should already be off because thats how I left it the last time I used

it.  A minor inconvenience, but irritating to me, and I dont really want to

add another panel switch.



Does anyone know whether there is something in the GTX327 instrument set up

that will allow me to change the default setting to power off instead of

power on?



thank you



Erich Weaver

khorton01(at)rogers.com
Guest

Posted: Thu Nov 02, 2006 3:18 am Post subject: GTX327 power switching

On 1 Nov 2006, at 12:32, Erich_Weaver(at)URSCorp.com wrote:



 	  Quote: 	
		   



 Does anyone know whether there is something in the GTX327  

 instrument set up

 that will allow me to change the default setting to power off  

 instead of

 power on?


	


My GTX-327 does not automatically turn on.  I must manually select it  

ON.  It is several years old, so perhaps they have changed the  

firmware.  It is possible that they added a configuration item for  

this new feature, but there is no mention of it in my old  

installation manual.  Is there any mention of this feature in the  

Configuration Pages section of your installation manual?



Kevin Horton         RV-8 (finishing kit)

Ottawa, Canada

http://www.kilohotel.com/rv8

dave(at)abrahamson.net
Guest

Posted: Thu Nov 02, 2006 3:58 am Post subject: GTX327 power switching

You don't mention whether you consulted the online installation 

manual, but if not it's at 

http://www.garmin.com/manuals/GTX327Transponder_InstallationManual.pdf. 

I find no mention of power-up configuration options, and the pin 

diagram for connector 3271 lists and "avionics master on", implying 

there is none.

n395v

Joined: 10 Jan 2006
Posts: 450

Posted: Thu Nov 02, 2006 5:30 am Post subject: Re: GTX327 power switching

Pin 1 is "avionics power on"



Pin 15 is "power input (11-33V)"



I believe if you wish it to remain off you need to disconnect pin one and run power to pin 15

_________________
Milt

Erich_Weaver(at)URSCorp.c
Guest

Posted: Thu Nov 02, 2006 9:07 am Post subject: GTX327 power switching

Milt wrote:



Pin 1 is "avionics power on"



Pin 15 is "power input (11-33V)"



I believe if you wish it to remain off you need to disconnect pin one and

run power

to pin 15

Milt, Im sure you are correct, as I received the identical answer from

someone on the Vansairforce site.  Thanks so much.

Erich Weaver

dfritzj(at)yahoo.com
Guest

Posted: Thu Nov 02, 2006 12:11 pm Post subject: GTX327 power switching

Erich,

  I have the same transponder and it does the same thing yours does.  I've looked into it a little bit, but am deployed so I can't look at the wiring on my unit.  There appears to be a pin on the connector that, if powered, is set up to have the unit power on automatically in the same state as last used when the avionics master is turned on (or power applied to the endurance bus in your case).  My guess is that this pin is jumpered to the bus power in my harness, I intend to check when I return.  Take a look at figure B4 in the installation manual.  (Here's a link to Andy Plunket's Glasair website with an install manual:  http://glasairproject.com/docs/Garmin327im.pdf)

   

  Dan Fritz



    [quote][b]

wgill10(at)comcast.net
Guest

Posted: Thu Nov 02, 2006 3:57 pm Post subject: GTX327 power switching

Leave pin 1 open and connect pin 15 to aircraft power (avionics bus)



Bill



--

zk-vii(at)rvproject.gen.n
Guest

Posted: Fri Nov 10, 2006 11:27 pm Post subject: GTX327 power switching

Hi, 

Just working through our  GTX327 connections, I can confirm: 

If pin 15 is connected and  pin 1 left unconnected, on 'power up' the box does not switch on until a manual  on/standby button is selected 

If pin 15 and pin 1 are connected, on  'power up' it automatically switches on (to standby). 

What I would like is the 'in between  option', ie. it remembers if it was on or off when power was removed from the  supply lines and returns to that state next time power is provided. 

Anyone got that situation working? Am I  just being too specific? 

Carl

--

ZK-VII - New Zealand - http://www.rvproject.gen.nz/  

 [quote]   --

phd1993

Joined: 04 Apr 2006
Posts: 18
Location: Overland Park, KS

Posted: Wed Nov 15, 2006 7:59 pm Post subject: Re: GTX327 power switching

I have been bench/panel testing my GTX327 during cable assembly prior to final installation in my panel and I can confirm the Pin 1 / Pin 15 configurations.



Now my question - if I have power supplied via Pin 15 and ground on Pin 25 WITHOUT connecting either the transponder antenna or the altitude encoder what should the GTX327 display at power on?  How about power on while holding down the FUNC button.  All I am getting is the "backpanel" illuminated with no other display items.  Is this proper?  Or do I need to connect either the antenna, the altitude encoder, or both before I start seeing any items displayed on the panel?



Feedback appreciated.



Thanks,



Sam H.

Zenith 701 kit

dave(at)abrahamson.net
Guest

Posted: Thu Nov 16, 2006 3:58 am Post subject: GTX327 power switching

My gtx330 displayed everything without either encoder or 

antenna.  Contrast/brightness adjustment may need to be adjusted?

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