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Re: LF: Windows software to drive a relay at a given time?

from [Andy Talbot] [Permanent Link][Original]
To: LineOne <[email protected]>
Subject: Re: LF: Windows software to drive a relay at a given time?
From: Andy Talbot <[email protected]>
Date: Thu, 26 Apr 2018 21:13:44 +0100
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Real RS232 are +Ve when asserted, -Ve when off.   That is what it was designed for.

If a TTL level converter were used, inversion would be necessary.  Of course, with an optical input SSR, you'd do that just by connecting the input the other way round. 
Opto-isolators make things so simple


On 26 April 2018 at 21:06, Nick <[email protected]> wrote:
On 26/04/18 20:53, Andy Talbot wrote:
> Have you checked it with any of your other COM ports?
> Check DTR and RTS both toggle appropriately
>
>
> Andy
> www.g4jnt.com
>
>

Just a WAG, but are real rs232 signals not inverted?

Nick
M0HGU


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