RS485 (EIA-TIA)

Question

Hi Everyone, 
 I am new here and my background does not match with the communication, that's why needs some guidance regarding the mentioned IC. I have a BLDC motor operating at voltage 24V and 45A current, having an absolute encoder with it. The absolute encoder works with RS485 protocol (A-format, also known as EIA). With the limited knowledge initially I purchased a motor driver which supports RS485 for absolute encoder. While testing the system with, I found the motor and driver still have issues, and they are not supporting each other. After discussing with the motor driver manufacturer, I came to knew that there is another protocol inside the RS485 known as "TIA". I was searching for some solution to this problem and found this (product number ADM2481) which is dealing with both these protocols (EIA and TIA). 
 Now, the point is if I try to find some converter or work on designing some converter between these protocols can this IC be of some help for me? Or another solution you can suggest resolving this issue, I have tried searching for compatible drivers but unable to find one, the motor supplier is suggesting me one, but it is PLC based and my system is not PLC based that's why I am not considering his suggestion.

ericb · Accepted Answer

Hello Hamza17, 
 Unfortunately you're going to need to work with either (or both of) the motor drive or encoder manufacturer to work out your issue. I suspect that there is a configuration or wiring mismatch in your setup and debugging this will require an understanding of your equipment and its operation. 
 In terms of your confusion regarding the standard names, they are basically all different historical names for the same standard. For more information see RS-485 (EIA/TIA-485) Differential Data Transmission System Basics . Thus, there is nothing to "convert between". 
 Note that the RS-485 and RS-422 are standards for defining the "Physical Layers" or "PHY" in the terminology of the OSI model for communications. The PHY is responsible for the physical electrical interface for sending the bits through the channel. All of other aspects of the interface are defined outside of this standard. Unfortunately this makes situations such as yours very challenging. 
 Eric)

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RS485 (EIA-TIA)