The best replacement for rs485 is rs232.

The best alternatives to rs485 are rated as following:
★★★★★  rs232
★★★★  rs422
★★★  can
★★★  rj45
★★  modbus
★  i2c
★  dh485
★  can bus
★  profibus
  rs232 difference
  rs422 difference
  rs 422
  tcp ip
  rs 232

Your alternative for rs485 is not listed? Suggest!
Speaking about rs485, one probably shouldn't forget about modbus.

Other search terms related to rs485 and their ratings are:
★★★★★ modbus
★ twisted pair
You have in mind a companion for rs485 and it is not yet here? Propose!



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rs485
rs232
rs422