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Sport GRT and Radio Stack

ExtraKatana

Well Known Member
Trying to get me Sport 10.1 to talk with my Apollo SL40 ans SL70.

The pinouts drawings for each radio/xponder say there is a return serial to the EFIS, but in parenthesis (ground). Is the return Serial actually going to Ground of the EFIS or the return serial pin?

I have the EFIS sending squak info to the xponder bit I’m getting an error message that the EFIS is not receiving from the radio.
 
Sounds a whole lot more like mis-pinning of a connector or mis-configuration of the serial port on the EFIS. As long as the EFIS and radio share a common ground (e.x. both are tied to the same metal instrument panel or similar) the RS232 returns generally don't require a lot of attention. In fact many people leave them out entirely and just rely on airframe grounding between the radios to carry the return.
 
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