DRO problem

[Xlmyford]

Hello.
My wife gave me a Sino DRO on Xmas,which is of the newest generation.
The linear scales are bought at allendale.
Here comes the problem.Their output is a 5vTTL signal,while the new DRO needs a EIA-422A signal.
After I installed the scales to my Myford,I found that these scales do not work with that DRO.
I tested the scales in conjunction with my older milling machine DRO and they worked fine.
I´m pretty sure that the different signal types causing my problem.
Is there a converter available,from 5v TTL to EIA-422A/RS422A?
Thank you for any help,Ralph

 

[Admiral_dk]

Hi Ralph

I've googled "ttl to rs422" and the first hit is http://www.bb-elec.com/product_family.asp?FamilyId=19
and there's other possibilities, depending on how comfortable you are with electronics. The interface can be as simple as a SN75179 8 pin IC if you already have 5V. available. The SN75179 is an transceiver, witch means that it contains an transmitter and a receiver. If you're uncomfortable with electronics look at the two first hits in Google, they're plug and play - so to speak.

 

[Davo J]

What Sino DRO do you have?

Dave

 

[Xlmyford]

Hello.
I´m not comfortable with electronics but as far as I found out, the RS422A is just the standard but it makes no
statement about the actual pin configuration.
Maybe you can understand that I ´m insecure which adapter to buy.
Allendale has told me that they are working on a solution for this 5vTTL to 422A problem.But how long will it take?
My Sino is a SDS 6-3V

Cheers,Ralph

 

[Davo J]

I have the same DRO, but it is about 2-3 years old. I see the Sino KA 300 scales state the have a output signal of 5v TTL/ EIA-422A.
http://www.cheaponsale.com/d-p1121283757875411600-linear_encoder_ka_300_series/

Might be easier sending the scales back and getting Sino ones.

Dave