Hi,

it is surely possible, however either it is adviseable to choose a coupler
with high CTR or use an amplifier. I use LTV817B, occasionally boosted by
an MC33172. The minimum current I could transfer is 150uA which is
deliberately served by a TX pin.
Regards,
Imre

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On Tue, 20 Jan 2004, Adi Linden wrote:

> Hi,
>
> I need to have a totally isolated serial port on my PC. Is it possible to
> drive an optocoupler directly off the TX line on the RS-232 port on a PC?
> Just wondering if there's enough drive for the optocoupler LED. I am
> thinking about using a 4N35.
>
> Thanks,
> Adi
>
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