Difference between MAX3430 and ADM483 for TTL-RS485 Converter
It is likely that the problem is the VCC1 voltage that you are using. If that voltage is +5V then I would expect the ADM483 to work just fine. It is designed to be used with a 5V supply. 

On the other hand the MAX3430 is designed to be used with a 3.3V power supply. In fact the part's absolute maximum VCC is 5V but that is on the edge of being damaged.

You did not link data sheets in your question, which is highly recommended here, so I wonder if you have carefully read the data sheets for these two parts. Doing so would have revealed what I have pointed out above. There may be some other differences between the parts which could only be determined by careful data sheet examination.