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KLX 135A pin out to autopilot?
- Thread starter Keith9A
- Start date
Kahuna
Moderatoring
BTW Keith, a quick google search says the folllowing....
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From a quick look at the install manual dated August 1995, its a standard
King/Aviation format output using RS-232. It's not NMEA. Garmin stuff like
430/530 and older Garmin things like the Apollo/UPSAT also output
King/Aviation format, so if the TruTrak works with them it should work with
the KLX135.
The KLX135 uses the extended sentence format that includes all flight plan
waypoints except when its in OBS mode. The sentence is transmitted once
every 2 seconds. The serial port setting is 9600/8/1/N.
The output is semi-human readable kind of like NMEA, so it can be
instructive to pipe it into your PC if you want to record your flight or
troubleshoot something.
Got word back from TruTrak themselves today that the 135 has too slow
output rate for the DigiTrak to maintain a consistent lock to the GPS.
The aviation data format and baud rate are ok, the information updates
themselves just don't come out of the 135 at a fast enough frequency.
Bummer.
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=====
From a quick look at the install manual dated August 1995, its a standard
King/Aviation format output using RS-232. It's not NMEA. Garmin stuff like
430/530 and older Garmin things like the Apollo/UPSAT also output
King/Aviation format, so if the TruTrak works with them it should work with
the KLX135.
The KLX135 uses the extended sentence format that includes all flight plan
waypoints except when its in OBS mode. The sentence is transmitted once
every 2 seconds. The serial port setting is 9600/8/1/N.
The output is semi-human readable kind of like NMEA, so it can be
instructive to pipe it into your PC if you want to record your flight or
troubleshoot something.
Got word back from TruTrak themselves today that the 135 has too slow
output rate for the DigiTrak to maintain a consistent lock to the GPS.
The aviation data format and baud rate are ok, the information updates
themselves just don't come out of the 135 at a fast enough frequency.
Bummer.
====
KLX 135A will work with Trutrak autopilot
After much research and actually installing the Trutrak ADI Pilot II autopilot in my RV-9A, I found that the KLX 135A will provide a valid GPS signal to the autopilot. I connected pin 10 from the KLX 135A to pin 17 on the ADI Pilot II, set the baud rate on the ADI Pilot II to 9600 and it worked.
The KLX 135A does update every other second which is slower than more modern GPS units. I have only flown a couple of cross country trips with this set up so my experience is limited. What I have observed is that the autopilot will hunt for the GPS track initially, but after several lateral oscillations will settle onto the GPS track and any delay in the update rate is not noticeable.
Hope this is helpful.
After much research and actually installing the Trutrak ADI Pilot II autopilot in my RV-9A, I found that the KLX 135A will provide a valid GPS signal to the autopilot. I connected pin 10 from the KLX 135A to pin 17 on the ADI Pilot II, set the baud rate on the ADI Pilot II to 9600 and it worked.
The KLX 135A does update every other second which is slower than more modern GPS units. I have only flown a couple of cross country trips with this set up so my experience is limited. What I have observed is that the autopilot will hunt for the GPS track initially, but after several lateral oscillations will settle onto the GPS track and any delay in the update rate is not noticeable.
Hope this is helpful.
