I'm looking to upgrade the GPS comm on my 6A. I currently have a 300XL connected to an HS 34 feeding my D100 HSI. Works great but would like to upgrade to a new Garmin 355XL GPS/Comm and get the improved display and WAAS with LPV capability. I contacted Dynon to ensure the 355 was compatible but was told it was not fully, that I would get horizontal guidance and display only, not vertical (including AP working horizontally only). The answer was a short "no, will work only horizontally" with no explanation. I did some manual lookup that does not appear to agree and sent it to the tech rep, but still got only the short answer with no explanation, although it seems that the manual information directly conflicts with the response. Has anyone connected a Garmin WAAS GPS to their D100/HS 34 and had it work correctly with vertical guidance? This is a bit frustrating to me as it certainly seems that it is stated to work. The literature implies this is a main benefit of the HS 34. Below is the information from Dynon which is applicable that to me conflicts with the tech response. I appreciate any feedback.
TR
Expanded HSI Navigation Interface: While all of Dynon's EFIS instruments currently include HSI functionality, full compatibility with some GPS and NAV radios has been limited by the serial connection method.
The HS34 overcomes these restraints by adding ARINC-429 and serial interfaces to cover many popular radios. With the addition of an HS34 to an EFIS, full compatibility is now possible with radios such as the Garmin 430/530. This includes advanced features IFR pilots demand, such as CDI auto-scaling and full vertical guidance information from WAAS-enabled units. The HS34 effectively eliminates the need to install a conventional CDI/GS head.
Some additional details from the D100 installation manual, Appendix for the HS 34, pages 7-13. Page 7-15 also shows a wiring diagram specifically for connecting to the GNC 300 series GPS.
" The three diagrams on this page depict generic device connections for devices outputting ARINC, serial, or analog data. If your device outputs multiple types of data, connect only one type to the HS34 in the following preference: ARINC preferred over serial; serial preferred over analog. ARINC data streams contain more information (vertical GPS guidance, GPS steering, etc) than serial streams and allow more control of your external device. Likewise, serial streams contain more information than that carried over analog lines. If your device is one of those listed in the next section, Common Device Connections, you may ignore this section. See page 3-4 for a chart of supported GPSs. "
TR
Expanded HSI Navigation Interface: While all of Dynon's EFIS instruments currently include HSI functionality, full compatibility with some GPS and NAV radios has been limited by the serial connection method.
The HS34 overcomes these restraints by adding ARINC-429 and serial interfaces to cover many popular radios. With the addition of an HS34 to an EFIS, full compatibility is now possible with radios such as the Garmin 430/530. This includes advanced features IFR pilots demand, such as CDI auto-scaling and full vertical guidance information from WAAS-enabled units. The HS34 effectively eliminates the need to install a conventional CDI/GS head.
Some additional details from the D100 installation manual, Appendix for the HS 34, pages 7-13. Page 7-15 also shows a wiring diagram specifically for connecting to the GNC 300 series GPS.
" The three diagrams on this page depict generic device connections for devices outputting ARINC, serial, or analog data. If your device outputs multiple types of data, connect only one type to the HS34 in the following preference: ARINC preferred over serial; serial preferred over analog. ARINC data streams contain more information (vertical GPS guidance, GPS steering, etc) than serial streams and allow more control of your external device. Likewise, serial streams contain more information than that carried over analog lines. If your device is one of those listed in the next section, Common Device Connections, you may ignore this section. See page 3-4 for a chart of supported GPSs. "