Re: TTL to HTL signal conversion

You can do a search on RS-232 bus interface drivers. RS-232
drivers are designed to work at up to +/-25V. The older
1488/1489 (and I believe 75451/75452) chips require +/-12V
power supplies, but most newer chips require only a single 5V
rail.

Lou Jackson


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Lars Levin"
<lars.levin@s...> wrote:

> Hello Group!
>
> I have a couple of old servodrives with step/direction
> inputs, but they use HTL signals, logic high is 24v
> instead of 5v.
> I want to be able to connect these to the parallell port,
> and therefor need some converter.
> Is there anybody that have some schematics or ideas for
> a preferably opto isolated 5v to 24v and 24v to 5v converter.
>
> Best Regards!
> Lars Levin