[chbot] TTL to Line driver

[Trevor Wignall]

TTL compatible CMOS chips are available, and will probably meet your need.
I haven't researched this, but I expect there will be suitable drivers
available. You might need two ICs, one inverting and one non-inverting. If
one output isn't grunty enough, two or more outputs can be parallelled.
Trevor

On Sat, Sep 12, 2020 at 7:20 AM Mark Atherton <markaren1 at xtra.co.nz> wrote:

> No sure how many channels you need, possibly 4 ?
>
> 26C31 is a standard quad RS422 driver. RS485 drivers can be used with
> the TX output enable tied active.
>
> MAX485 is a single channel, and I guess at NZ$3.50 ea, you could buy
> several
>
> also have a look at
>
> https://www.trademe.co.nz/a/marketplace/electronics-photography/other-electronics/electronic-components/other/listing/2775249657
>
>
> -Mark
>
>
>
> On 11/09/2020 10:44 PM, Martin Towers wrote:
> > Hi Wallace,
> > You might try looking for TTL to RS485 converters.
> > This is a bad example - it's expensive and in India, but it shows they
> > exist.
> > https://robu.in/product/max485-ttl-rs485/
> >
> > Martin
> >
> >
> > On Fri, 2020-09-11 at 16:12 +1200, Marshland Engineering wrote:
> >> My encoder has become intermittent on my CNC mill. I have found that
> >> my Liner
> >>   scale from Aliexpress has the correct resolution to work with the
> >> controls.
> >>   The problem I have is the linear scale is TTL output and the
> >> connection I
> >>   require is differential equivalent to a SN75183.
> >>
> >> https://www.ti.com/lit/ds/symlink/sn75183.pdf
> >>
> >> Anyone know of an off the shelf TTL to differential unit. My searches
> >> don't
> >>   yield much other than discrete components.  Maybe there is another
> >>   workaround?
> >>
> >> Thanks Wallace.
> >>
> >>
> >>
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