[chbot] TTL to Line driver

[Mark Atherton]

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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