RS485 to TTL converter 321L485 need consult

Main question is: can i use AR-321L485 converter arduino boards? It not damage arduno uno or arduino yun?

I want to control delta inverter VFD-E using RS485 and arduno uno or arduino yun. if i miss something plz tell me.
I just want to know can i use AR-321L485 converter connect to Arduino? it's complicated or not?

arduno uno chip works 5 volt, but 321L485 converter powered on 12 volt. it is safe to connect to arduino?

Do you have a link to "321L485" ?

can't find link to 321L485 datasheet or other info...
im not sure i can connect to arduino.
TTL have defined voltage ? i need to know more about TTL, arduino, and converter AR-321L485 ...
AR-321L485 found only http://www.soyal.com/product.php?act=view&id=43
there are more but nothing usefull SOYAL