GPS and SL30 connection points
Depending on the number and types of Dynon units you own, you have several options for connecting a GPS unit and/or Garmin/Apollo SL30 to your Dynon system. The GPS can be used as a source for both the HSI and Fuel pages. The SL30 can be used as a VOR or localizer source for the HSI. If you wish to connect a GPS and/or SL30 to your Dynon system, read the section below which corresponds to your set of Dynon products.
To fully use the GPS-related features on your EFIS and/or EMS, your GPS must output the following NMEA sentences in its serial stream: $GPRMC, $GPRMB, $GPGGA, $GPBOD, and $GPAPB. All of these connection schemes assume that the external devices share a common ground with the Dynon product(s). If your GPS is battery powered, and not normally connected to aircraft ground, you must connect the ground pin on its serial output to a ground common to the EFIS or EMS that your GPS is connected to (e.g., pin 9 on the EFIS DB25, or pin 16 on the EMS DB37).
When a Dynon product is connected to a GPS, it will synchronize its Zulu clock to that output by the GPS.
If you own only an EFIS-D10A or EFIS-D100:
Hook the GPS or SL30 transmit line into pin 22. This is the same Serial RX line that is used for firmware updates. You'll need a way to disconnect this when you hook up a PC.
If you have both a GPS unit and an SL 30, you'll need to hook the two transmit lines to a switch and use this switch to decide which one you want displayed on the HSI. The HSI will auto-detect the switch being changed and will change modes automatically.
If you own an EMS-D10 or EMS-D120:
Hook the GPS transmit line into the EMS pin 19 on the D-37 connector. This is labeled "Fadec RX." This connection will give you range, MPG, etc. No point in hooking up an SL 30 since that only sources info for the HSI display which requires an EFIS. No need to break this connection when doing PC updates.
If you own an EMS AND an EFIS:
Hook the GPS or SL30 transmit line into the EMS pin 19 on the D-37 connector. This is labeled "Fadec RX." This will share the data between the EMS and EFIS and allow you to display an HSI on either product, as well as do EMS economy displays.
If you have a GPS and an SL 30, hook the GPS up as above. Hook the SL 30 to pin 22 on the EFIS. This will allow you to use the "NAVSRC" button on the HSI to flip between inputs. The only tradeoff here is that you can only display a GPS HSI on the EMS. You can see either the SL 30 or GPS on the EFIS. You'll need to disconnect the SL 30 from the EFIS when doing software updates.
Alternatley, you can use a switch into the EMS which will allow you to see both the SL 30 and GPS on both the EFIS and EMS, but you will only be able to see one at a time.
If you own a D180:
Hook the SL 30 unit to pin 22 on the EFIS (vertical D-25) and the GPS to pin 19 on the D-37. You can display either source on the HSI with the "NAVSRC" button. You'll need to disconnect the SL 30 from the EFIS when doing software updates.
If you own a D180 AND an EFIS:
Hook the SL 30 unit to pin 22 on the EFIS (vertical D-25) and the GPS to pin 19 on the D-37. You can display either source on the HSI with the "NAVSRC" button, and you can display either on the standlone EFIS as well. You'll need to disconnect the SL 30 from the EFIS when doing software updates.