First, wire the EchoUAT to the iEFIS according to this article. The article shows using the EchoUAT with the Sandia transponder, but other transponders can be used. Then, follow the instructions below:
Note: With the EchoUAT, the EFIS does NOT control the EchoUAT - the connected Transponder does ALL control of the EchoUAT, including setting the squawk on the EchoUAT, and providing encoded altitude (which in some cases comes via the EFIS, but not directly).
Here are the setup steps for configuring the EchoUAT and the iEFIS and iEFIS Lite to display weather and traffic:
Follow uAvionix's instructions to setup the EchoUAT with their available iOS App via Wifi. Setup your aircraft per their instructions.
With the Sandia and EchoUAT combination, the EFIS is used to send encoded altitude to the Sandia transponder, and the pilot sets the squawk and mode of the Sandia Mode-C transponder from the iEFIS screen, and the transponder then sends this information to the EchoUAT ADS-B transceiver. The only connection the iEFIS has with the EchoUAT ADS-B is to receive weather and traffic data from the EchoUAT. Because of this, the EchoUAT is considered a 'receive-only' ADS-B as far as the EFIS is concerned. Although the ADS-B is an IN and an OUT, to the EFIS, it is just an IN.
In MENU > SYSTEM SETUP MENU > ADS-B SETUP: Setup as ADS-B is RECEIVE ONLY
Setup EchoUAT as 'Navworx ADS-B' on the Serial Port it is connected to in MENU > SYSTEM SETUP MENU > SERIAL PORT ROUTING/ALLOCATIONS. Remember to exit settings and then restart EFIS for serial port allocations to take effect.
Since we are not controlling the EchoUAT from the EFIS, we do not need an ADS-B controller on the screen. The transponder control and status indicator is all we need on the screen. Therefore, we do not need to enable the ADS-B in MENU > SYSTEM SETUP MENU > EQUIPMENT ENABLES, since this can turn on the ADS-B controller on the screen. This device may be disabled in the menu: