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<font face="Souvenir Lt BT">Hi Guys..<br>
I'm not quite sure what the problem is and what solution it needs
but would the MAX232 TTL to RS232C (RS232C is the standard I/O
port protocol of your PC or Laptop) converter chip do the trick?
It might allow you to use several of them if several input
channels are required.<br>
<br>
Regards, Robert (Bob) <br>
ZL2ROB (QTHR) <br>
Christchurch.<br>
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<pre class="moz-signature" cols="72">
Phrase of the day: Discussion must always be about policies and NEVER about politics...
RWW.</pre>
<div class="moz-cite-prefix">Alan wrote on 12/09/2020 3:30 PM:<br>
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<p>Stupid question: would a usb / ttl converter do what you need?
I have at least one cable you are welcome to try (possibly
another somewhere)<br>
</p>
<p><a class="moz-txt-link-freetext"
href="https://nz.mouser.com/ProductDetail/BK-Precision/IT-E132?qs=s9e3C%252B7F3LmVKDVIizC16w=="
moz-do-not-send="true">https://nz.mouser.com/ProductDetail/BK-Precision/IT-E132?qs=s9e3C%252B7F3LmVKDVIizC16w==</a></p>
<p>Cheers</p>
<p>Alan<br>
</p>
<div class="moz-cite-prefix">On 12/09/20 1:14 pm, Trevor Wignall
wrote:<br>
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<div dir="ltr">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.
<div>Trevor</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sat, Sep 12, 2020 at 7:20
AM Mark Atherton <<a href="mailto:markaren1@xtra.co.nz"
moz-do-not-send="true">markaren1@xtra.co.nz</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">No sure how many channels
you need, possibly 4 ?<br>
<br>
26C31 is a standard quad RS422 driver. RS485 drivers can be
used with <br>
the TX output enable tied active.<br>
<br>
MAX485 is a single channel, and I guess at NZ$3.50 ea, you
could buy several<br>
<br>
also have a look at <br>
<a
href="https://www.trademe.co.nz/a/marketplace/electronics-photography/other-electronics/electronic-components/other/listing/2775249657"
rel="noreferrer" target="_blank" moz-do-not-send="true">https://www.trademe.co.nz/a/marketplace/electronics-photography/other-electronics/electronic-components/other/listing/2775249657</a>
<br>
<br>
<br>
-Mark<br>
<br>
<br>
<br>
On 11/09/2020 10:44 PM, Martin Towers wrote:<br>
> Hi Wallace,<br>
> You might try looking for TTL to RS485 converters.<br>
> This is a bad example - it's expensive and in India,
but it shows they<br>
> exist.<br>
> <a href="https://robu.in/product/max485-ttl-rs485/"
rel="noreferrer" target="_blank" moz-do-not-send="true">https://robu.in/product/max485-ttl-rs485/</a><br>
> <br>
> Martin<br>
> <br>
> <br>
> On Fri, 2020-09-11 at 16:12 +1200, Marshland
Engineering wrote:<br>
>> My encoder has become intermittent on my CNC mill.
I have found that<br>
>> my Liner<br>
>> scale from Aliexpress has the correct resolution
to work with the<br>
>> controls.<br>
>> The problem I have is the linear scale is TTL
output and the<br>
>> connection I<br>
>> require is differential equivalent to a SN75183.<br>
>><br>
>> <a
href="https://www.ti.com/lit/ds/symlink/sn75183.pdf"
rel="noreferrer" target="_blank" moz-do-not-send="true">https://www.ti.com/lit/ds/symlink/sn75183.pdf</a><br>
>><br>
>> Anyone know of an off the shelf TTL to differential
unit. My searches<br>
>> don't<br>
>> yield much other than discrete components. Maybe
there is another<br>
>> workaround?<br>
>><br>
>> Thanks Wallace.<br>
>><br>
>><br>
>><br>
>> _______________________________________________<br>
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Meetings usually 3rd Monday each month. See <a class="moz-txt-link-freetext" href="http://kiwibots.org" moz-do-not-send="true">http://kiwibots.org</a> for venue, directions and dates.
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<pre wrap="">_______________________________________________
Chchrobotics mailing list <a class="moz-txt-link-abbreviated" href="mailto:Chchrobotics@lists.ourshack.com">Chchrobotics@lists.ourshack.com</a>
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Mail Archives: <a class="moz-txt-link-freetext" href="http://lists.ourshack.com/pipermail/chchrobotics/">http://lists.ourshack.com/pipermail/chchrobotics/</a>
Meetings usually 3rd Monday each month. See <a class="moz-txt-link-freetext" href="http://kiwibots.org">http://kiwibots.org</a> for venue, directions and dates.
When replying, please edit your Subject line to reflect new subjects.</pre>
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