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10-28-2015, 07:45 PM
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Join Date: May 2013
Location: Mount Vernon, Wa
Posts: 643
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How about using an off the shelf solution like the ESD CAN Bus? It'd need a little modification to adapt to this specific application. But, it would seem to me to be a lot more robust, and definitely a cleaner install than the daisy-chained molex connectors.
https://esd.eu/en/products/can-cable-accessories
__________________
Ken W.
Mount Vernon, WA
2020 VAF Supporter
Last edited by N804RV : 10-28-2015 at 07:47 PM.
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10-31-2015, 11:10 AM
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Join Date: Apr 2008
Location: Central Iowa
Posts: 317
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GDU 4501/4601 Connector?
Couple questions about the GDU 450/460 and the 9 pin connector P4501.
I sent this question to Stein as well as G3X- there is a CAN BUS connection on both the P4501 and P4502 connectors on the GDU 450/460. (There is also the RS232 backup). Do I use all three of these?
The response from Stein was do NOT use the CAN connection on P4501. I'm okay with that, but did I miss this information earlier in the document or something? Have not heard from G3X on this yet.
And a new question that probably applies to several other devices in the G3X installation. There are two GND connections on P4501. Should both be used? I will not be using a backup power supply initially but plan on it as my phase two install/upgrade. So I will rough in the second power wire to the connector. Are the two grounds isolated and pair with their respective power pins?
EDIT: I think I see now that the pin 6 is the ground for the rs 232 so the ground on pin 9 is the ground for BOTH 12v power, correct?
My plan is to add a second screen, EIS and backup power next year sometime, after I get the first screen installed and use it for a while.
__________________
RV-6
RV-10 tail kit 50%
(When do I get to measure something?)
"Flying north of the Arctic Circle and back - several thousand dollars,
Doing it in an RV you built yourself - PRICELESS!"
Last edited by Jimd : 10-31-2015 at 11:20 AM.
Reason: EDIT:
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10-31-2015, 12:01 PM
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Join Date: Sep 2010
Location: Olathe, KS
Posts: 2,885
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It's in the mail.
Hi Jim,
Please check your email and let us know if you have any more questions.
Thanks,
Steve
__________________
Garmin G3X Support
g3xpert@garmin.com
1-866-854-8433 - 7 to 7 Central Time M to F
Please email us for support instead of using Private Messaging due to the limitations of the latter.
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10-31-2015, 01:18 PM
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Join Date: Apr 2008
Location: Central Iowa
Posts: 317
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CAN BUS
Here is the response from G3X to my question above To keep this thread continuous, so to speak. Jim
Hi Jim,
Good question. Please use the CAN bus on the GDU 4502/4602 50 pin connector to connect these GDUs to the CAN bus.
Please use the RS-232 connection (serial port 6) on the GDU 4501/4601 9 pin connector to connect the backup data bus to the GSU25 and do not connect the CAN bus on this connector.
Thanks,
Steve
__________________
RV-6
RV-10 tail kit 50%
(When do I get to measure something?)
"Flying north of the Arctic Circle and back - several thousand dollars,
Doing it in an RV you built yourself - PRICELESS!"
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11-01-2015, 12:46 PM
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Join Date: Apr 2008
Location: Central Iowa
Posts: 317
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Lighting Bus on GDU ?
Does anyone know if I can hook the pin 43 14v lighting bus pin to one of the vans light dimmer outputs? The dimmer puts out 1.5v max at hi setting?
The G3X doc talks about this in section 22.3.9 but I don't understand it.
"The GDU 45X/46X display and keys can be configured to track 28 VDC or 14 VDC lighting busses using these inputs. These inputs are reference voltage inputs (not power inputs) with a high impedance of
~100 kΩ for pin 43 and ~200 kΩ for pin 26. This backlight level reference signal may be supplied with something as simple as a 10K potentiometer connected to power and ground (drawing 1 mA @ 14 VDC). The center tap on this potentiometer is connected to one of the pins (43 or 26) in the following table. For providing this reference signal to more than one device, a commercially available regulated backlight voltage reference is recommended."
Thanks...
__________________
RV-6
RV-10 tail kit 50%
(When do I get to measure something?)
"Flying north of the Arctic Circle and back - several thousand dollars,
Doing it in an RV you built yourself - PRICELESS!"
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11-01-2015, 04:03 PM
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Join Date: May 2014
Location: Savannah
Posts: 806
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Quote:
Originally Posted by Jimd
Does anyone know if I can hook the pin 43 14v lighting bus pin to one of the vans light dimmer outputs? The dimmer puts out 1.5v max at hi setting?
The G3X doc talks about this in section 22.3.9 but I don't understand it.
"The GDU 45X/46X display and keys can be configured to track 28 VDC or 14 VDC lighting busses using these inputs. These inputs are reference voltage inputs (not power inputs) with a high impedance of
~100 kΩ for pin 43 and ~200 kΩ for pin 26. This backlight level reference signal may be supplied with something as simple as a 10K potentiometer connected to power and ground (drawing 1 mA @ 14 VDC). The center tap on this potentiometer is connected to one of the pins (43 or 26) in the following table. For providing this reference signal to more than one device, a commercially available regulated backlight voltage reference is recommended."
Thanks...
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I doubt that it will work correctly since full bright reference is only 1.5 volt. I recently installed the lighting buss wiring on a dual screen G3X touch system to include the autopilot controller and audio panel connected to one 100k pot. As long as you are not wiring the pot to old avionics that have incandescent internal backlighting a single pot should work.
__________________
Mike Hammond
A&P IA PPL ASEL
RV-14A kit S/N 140170
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11-01-2015, 04:22 PM
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Join Date: Oct 2014
Location: WA
Posts: 70
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Dimmer works
Quote:
Originally Posted by Mike H
I doubt that it will work correctly since full bright reference is only 1.5 volt. I recently installed the lighting buss wiring on a dual screen G3X touch system to include the autopilot controller and audio panel connected to one 100k pot. As long as you are not wiring the pot to old avionics that have incandescent internal backlighting a single pot should work.
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I have this vans dimmer Part Number = ES DIMMER, LAMP 1.5AA connected to all of my lighted panel items(switches and led strip) and also to the g3x touch. It does work, but I disabled it in the g3x system and just let the g3x's built in photo eye control the screen brightness. It is incredibly adjustable this way, so I prefer it
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11-01-2015, 04:46 PM
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Join Date: Apr 2008
Location: Central Iowa
Posts: 317
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Lighting
I wondered if the internal light was good enough by itself without using the external pot? Do you have to adjust it for day or night operation or does it do that by itself with the optical sensor?
__________________
RV-6
RV-10 tail kit 50%
(When do I get to measure something?)
"Flying north of the Arctic Circle and back - several thousand dollars,
Doing it in an RV you built yourself - PRICELESS!"
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11-01-2015, 04:56 PM
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Join Date: Oct 2014
Location: WA
Posts: 70
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Quote:
Originally Posted by Jimd
I wondered if the internal light was good enough by itself without using the external pot? Do you have to adjust it for day or night operation or does it do that by itself with the optical sensor?
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If you can think of a way you want it to adjust, I can just about guarantee that it already has the ability. You just need to go into the lighting options and find it. When I first saw all of the adjustable parameters, I was a little overwhelmed. Look at the manuals if you haven't powered up the system yet to see all of the options
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11-02-2015, 09:35 AM
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Join Date: Jun 2010
Location: Stilwell, KS
Posts: 1,096
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Quote:
Originally Posted by Walt
I can understand how something like the above may be useful from a production standpoint, but from a reliability standpoint you just added 9 extra connections at each LRU, that are of marginal quality, to a critical data bus.
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Our way is just one way to do it. I shared it here to help people visualize how a wiring harness can be structured.
I suppose I should've said that these are VFR-only airplanes, so there's really nothing "critical" to flight safety. Single-screen with ADAHRS, engine analyzer, radio, servos. (Transponder isn't on the CANBUS.) If it was an IFR system, yes, it would be better to minimize the number of connectors. But ease of production and future maintenance are also important in our case.
__________________
Katie Bosman
RV-3B sold, but flying!
Next project: ???
Builders gonna build...
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