>Just curious.
>Do you control as like as PLC or do you monitor and supervise with ths PC/VFP stuff?
>
>I only mean that PLC / ardunie RasPi stuf is not expensive those days and that the time you need to master this might equal the time to get around all the problems you might consider with PC/VFP.
>
>VFP might look more familiar, but the things the might result in the setting could be worst. And from time to time it's good to look at a new language too. Possibly VFP breaks with the next version ....
>:D

Ah, no, sorry, I agree with you about the PLC/VFP, I just had different experience with serial communications, I (probably mis-) read your message as saying that it was unreliable this days with new hardware, and that has not been our experience.

About your question, we only use it as monitoring, and the appeal of serial communications is that is only one way (only using transmit and ground lines), so there is no (should I say minimal?) security danger