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I connected an encoder that has index, but I don't see any activity regarding that pin.

I could not find online your servo drive manual. But found CMC manual for brushed DC motor with tachometer input.

ttps://www.artisantg.com/info/Cleveland_Motion_Controls_SDB_Series_Manual.pdf?srsltid=AfmBOorzCltvtjGyzWiOyaa6-XFNoLaBcmwPmFUnsA8L5EootgrmcSKG I am assuming this manual is similar to yours. If it is than you need to set the four digital inputs  SBY, OSW, SW1 AND SW2,  for the motor to spin in both direction  the inputs must be set to satisfy the operational conditions of the drive (digital inputs require 24vdc power)

Did you find a solution?  What version of LinuxCNC are you running? 
I have a similar issue.  It was running fine with LinuxCNC version 2.8, but after upgrading to 2.9.3 I get "PREOP E" errors and the drives won't enable.  It seems to be random which drives go to PREOP E and which ones go to OP.  Restarting LinuxCNC multiple times gives random results.
I get sync manager timeouts and failures to write SDO's.

Hi! I had a friend over who tried to help me but with no success. Do you recomend some working usb wifi-card. The ax200 Intel chip was not so good