A servo-amplifier has a RS232C-communication I/F circuit, a RS422 (RS485) communication I/F circuit, and a CPU 11. The CPU 11 of this servo-amplifier fetches data received by the RS232C-communication I/F circuit into a local station, converts the received data to communication data for RS422 (RS485)...http://www.google.co.uk/patents/US6535938?utm_source=gb-gplus-sharePatent US6535938 - Servo-amplifier for a multiaxis driving control system
