The CS-428/9AT Mini converts RS232 signals to RS422 or RS485. It operates without any software installations. Simple DIP switch toggling between RS422 or RS485.
It's a great solution for applying advantages of RS422/485 to legacy RS232 devices.
You can overcome the short communication distance by converting RS232 signals to RS422 or RS485 and extend your wires up to 1.2 Km.