Re: Send 5 Volts on off signal for ant switch relays

Simon <simonhk7@...>

Hi Dave,

Many thanks for advises.

Can laptop pc be used with "usb to lpt convertion cable"?

The last line in wiki says pci plug in board on desk pc is good. Usb device can not be used. Wonder if this had relaxed over time as now?

By the way, lpt has about 4 digital pins for reading. Can the software configurated to read these? For example, over temperature signal and the software be configure to perform some auto action, like send a cat command to set lower power?



On Friday, March 19, 2021, Dave AA6YQ <aa6yq@...> wrote:
+ AA6YQ comments below

Planning for a home brew relay box to route the rig to diffetent ant depends on band.

Can the software send 5 Volts on off signal via a hardware box?

+ Yes. See "Controlling an External Device like an Antenna Switch via a Parallel Port" in


             Dave, AA6YQ

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