ENRAF 873 ONLY READS 999999

I have an Enraf 873 smart radar unit that is reading all 9's instead of product level. Any help available? I have codes.
Hi, friend. I have the same problem as you. The Enraf 873 radar, despite configuring the most elementary parameters (LD, OM, PR, DE, RL), indicates only numbers "9". The manual indicates that it is an initialization value, but there are no further details.
 
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