MASTERDRIVES可以备份，接口具体接线如下：
A point-to-point connection (RS232) between the PC and one MASTERDRIVES converter is only possible using the SST1 interface of the converter.
For PC (COMx) and PG7xx (COM2):
Pin 2 ---> Pin 7 (X300)
Pin 3 ---> Pin 2 (X300)
Pin 5 ---> PIN 9-1-5 (X300)
A complete connecting cable (length 3m) is available with
order No.: 9AK1012-1AA00.