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Hello Patrick,

If I set direwolf to RTS it triggers FSK and dead keys
If I set direwolf to DTR it triggers PTT and dead keys
If I set direwolf to RTS DTR it triggers PTT and FSK properly, as it should, RTS is set to PTT and DTR is set to FSK
-RTS DTR gives me PTT dead key
RTS -DTR gives me FSK dead key

It seems to me the application is sending the signal but not dropping it as it should or the signals are inverted from what they should be OR stop bits need to be put in place

I also see on the LInuxHams list, you mentioned:

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PTT /dev/ttyUSB1 -DTR RTS
then the FSK light comes on and when it transmits it flips from FSK to PTT without a dead key.
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Are you saying that Direwolf keys up SCU-17 and it's "FSK" indicator lights up but Direwolf stays playing audio (AFSK modem tones), the SCU-17's turns off the FSK light and then turns on the PTT light?? If so, that does NOT sound right at all.? If you would, please try Direwolf v1.6.?? I would expect Direwolf v1.7* as very stable now but it's NOT released code and it's still undergoing change.

direwolf is the common denominator in this equation. It's as if it's giving the wrong serial signal, and no I'm not the only one that's had this issue.
My fellow ham has had this issue and a search on the web can find others

The vew fellow HAMs who have had issue have been either using unusual sound devices, using unusual isolation devices, etc.? Direwolf can be made to work with any of them but you have to determine what the right signal is for each of them.? In your circumstance, the SCU-17 documentation is non-existent which makes it extra hard.?

At this point I'm seriously considering switching to a hardware TNC if I'm going to work around the problem.

While Direwolf is a novel application and concept it does not work in all situations, many YES but not all and some have to make it work by working around any problems they may run into.

Of course the choice is yours but I can nearly guarantee you that Direwolf will out perform *any* hardware TNC you buy.? TNCs like a KPC3+ or PK96 can come close but most of the PIC/Arduino based units will have significantly poor decode rates.

This is sad to me. Will I use Direwolf again? Sure, I'll try it but if I run into similar issue I'll likely just spend the time or money to find another solution rather than waste hours upon hours of my time troubleshooting a problem I know to be a software issue.

Well.. I hear the frustration here but Direwolf has recommend hardware mentioned in the User Guide but you're not using that.? You also were doing a lot of testing and you might have actually missed the test that either "-DTR RTS" or "-DTR RTS" was actually working for you (ignore whatever the LED lights are as there is no FSK signal here in AFSK1200 packet).? FSK from an SCU-17 perspective is used for things like "real" RTTY or CW on HF radios.

--David
KI6ZHD