Today's Message Index:
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1. 04:23 PM - GPS 175 Wiring Question (farmrjohn)
2. 06:11 PM - Re: GPS 175 Wiring Question (David Carter)
3. 07:38 PM - Re: GPS 175 Wiring Question (farmrjohn)
Message 1
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| Subject: | GPS 175 Wiring Question |
I'm in the process of making the wiring harness for a GPS 175 installation and
would like to have the automatic power on feature. I am confused by the information
in the installation manual though and have a question into Garmin. While
waiting for a response I thought I'd ask here as well.
On the pin-out diagram and the table referring to that pin, #61, it is listed as
an "in". However, on the one wiring diagram that shows pin 61 it is connected
to the aircraft ground and is diagramed as an "out". The footnote associated
refers back the previous section that has it as an "in". I've attached the
portions from the installation manual in question.
Thanks, John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=515201#515201
Attachments:
http://forums.matronics.com//files/gps_wiring_199.pdf
Message 2
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| Subject: | Re: GPS 175 Wiring Question |
This is very straightforward as documented. If pin 61 is connected to
ground, auto power on is enabled and the unit will startup when power is
provided on 21 & 42. This is sensing a logic level 0.
If 61 is not connected to ground (floating), auto power on is disabled &
you have to power on the unit manually.
---
David Carter
david@carter.net
On Thu, Jan 9, 2025 at 7:24=AFPM farmrjohn <faithvineyard@yahoo.com>
wrote:
> faithvineyard@yahoo.com>
>
> I'm in the process of making the wiring harness for a GPS 175 installatio
n
> and would like to have the automatic power on feature. I am confused by
> the information in the installation manual though and have a question int
o
> Garmin. While waiting for a response I thought I'd ask here as well.
>
> On the pin-out diagram and the table referring to that pin, #61, it is
> listed as an "in". However, on the one wiring diagram that shows pin 61
it
> is connected to the aircraft ground and is diagramed as an "out". The
> footnote associated refers back the previous section that has it as an
> "in". I've attached the portions from the installation manual in questio
n.
>
> Thanks, John
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=515201#515201
>
>
> Attachments:
>
> http://forums.matronics.com//files/gps_wiring_199.pdf
>
>
===========
===========
===========
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>
>
Message 3
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| Subject: | Re: GPS 175 Wiring Question |
Thank you. I guess my confusion comes from the terminology used on the pin-out
diagram and description table where the pin is labeled "in".
An additional confusion point is the GTX 327 transponder wiring that is installed.
In that instance there are only 5 wires in the harness, but not connected
as in the wiring diagram, attached as PDF (transponder works). As wired, there
is an airframe ground connected to pin 1, and a power in through a circuit
breaker to pin 15. The other three wires go to a Trans-Cal altitude encoder:
pin 13 to encoder ground, 14 to encoder power, and 19 to encoder's RS-232 transmit.
The encoder itself has a total of four wires, the fourth goes to airplane
ground.
Reading note 5, it sounds like transponder pin 1 should be connected to pin 15
for the auto-on to function. As wired, it does not. Is the transponder receiving
its ground through the encoder or pin 1 or through the encoder? If thought
pin 1, should the auto-on be functional?
Thanks again,
John
david(at)carter.net wrote:
> This is very straightforward as documented. If pin 61 is connected to ground,
auto power on is enabled and the unit will startup when power is provided on21
& 42. This is sensing a logic level 0.
>
>
> If 61 is not connected to ground (floating), auto power on is disabled & you
have to power on the unit manually.
>
>
>
>
> ---
> David Carter
> david@carter.net (david@carter.net)
>
>
>
>
>
> On Thu, Jan 9, 2025 at 7:24PM farmrjohn wrote:
>
>
> >
> > I'm in the process of making the wiring harness for a GPS 175 installation
and would like to have the automatic power on feature. I am confused by the information
in the installation manual though and have a question into Garmin.
While waiting for a response I thought I'd ask here as well.
> >
> > On the pin-out diagram and the table referring to that pin, #61, it is listed
as an "in". However, on the one wiring diagram that shows pin 61 it is connected
to the aircraft ground and is diagramed as an "out". The footnote associated
refers back the previous section that has it as an "in". I've attached the
portions from the installation manual in question.
> >
> > Thanks, John
> >
> >
> >
> >
> > Read this topic online here:
> >
> > http://forums.matronics.com/viewtopic.php?p=515201#515201 (http://forums.matronics.com/viewtopic.php?p=515201#515201)
> >
> >
> >
> >
> > Attachments:
> >
> > http://forums.matronics.com//files/gps_wiring_199.pdf (http://forums.matronics.com//files/gps_wiring_199.pdf)
> >
> >
> >
> > ==========
> > -
> > Electric-List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?AeroElectric-List
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> >
>
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=515203#515203
Attachments:
http://forums.matronics.com//files/xponder_pins_114.pdf
http://forums.matronics.com//files/xponder_diagram_157.pdf
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