PTT via COM - switchable Input

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df6dbf
Posts: 4
Joined: Tue Jan 19, 2021 5:05 pm

PTT via COM - switchable Input

#1

Unread post by df6dbf »

Hello,
i suggest to make the polarity of the PTT input switchable.
So you can use a simple Pull-Up Resistor between RTS and CTS/DSR and you need only a external Key with 2 wires.

Tried it with an Resistor but get "reverse" Logic. (Must press my PTT to receive)

73s Holger

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PD3LK
Posts: 517
Joined: Thu Aug 06, 2020 10:36 am

Re: PTT via COM - switchable Input

#2

Unread post by PD3LK »

Holger,

If you are using a USB <-> Serial cable with a Profilic chip than there's a option that maybe work's...

See this picture, the settings beneath the Com Port Number setting are proberbly not visable when you use a serial ports on your motherboard.
With my Profilic cable it shows these extra options. Hope to hear if this was helpfull.

73, Leon
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DTR-RTS Level shift.jpg

df6dbf
Posts: 4
Joined: Tue Jan 19, 2021 5:05 pm

Re: PTT via COM - switchable Input

#3

Unread post by df6dbf »

Thanks! Will try this, but i also use a Laptop with build In COM-Port. :/

73, Holger DF6DBF

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