I have used with success up to 115200bps a few optocouplers:
H11L1, MOC5007 or PC900V.
If my memory has no faulty memory locations, all above have an inside
trigger schmidth and works with IR currents below 5mA. (H11L1 even
with 1mA).

success,
VAsile

On 6/21/06, Joe Mailer <maildmx@yahoo.es> wrote:
> Hello,
>
> I have two systems A and B. I'd like to have a robust optically isolated =
communication line (going real time). I have choose RS-232/422/485 as possi=
ble communication protocols.
>
> I have been searching the net for optoisolators, there are a huge amount =
of those, but thinking that communication is bidirectional and it could be =
fast, what are more suitable optoisolators for doing such a thing ? I have =
been looking to (new) analog iCouplers[1], those look good, but i need good=
 MTBF and good support in the future.
>
> Any other good idea ?
>
> Thanks !
>
> [1] http://www.analog.com/UploadedFiles/Product_Highlights/61991380562796=
3397963229iCoupler_Brochure.pdf
>
>
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