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Hi,

I’m looking for an inexpensive interface for a few MT1271 length gages. These have an RS-422 TTL 5v Output (not the sinusoidal output) as far as I’m able to tell, and a resolution of 0.2μ.

Here on page 7 is an interface description: https://www.heidenhain.de/fileadmin/pdb/...ces_en.pdf

I was looking at a MAX14890, but like the idea of Yuriy’s already finished design (less work for me  Big Grin)

Would the Quadrature Board be capable of reading these? 

Kind regards,

Sam
Yuriy says he uses 5 micron scales and implies that he's tested 1 micron scales. He'll probably answer you shortly, but I think the only potential issue with a 0.2um scale would be whether the MSP430 could keep up. If you're moving at Heidenhain's 500mm/sec maximum traversing speed for the MT1271 then you're looking at a 2.5Mhz signal. I think that would be your limiting factor.