Sdi input does not work

I HAVE TWO ENC4S AND BOTH ARE NEW, WHEN I ARRIVED I CONNECTED THE CABLES AND THEY DO NOT SHOW PICTURES. I CONNECTED THE SDI CABLE TO AN ATEM AND EVERYTHING WORKS NORMAL. HAS ANYONE EVER EXPERIENCED THIS? SUGGESTED SOLUTIONS?

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Hi

Is your input SDI signal level B?
Older versions of ENC4S do not support this information.