The EM1016 uses Chipset: Prolific PL2303GC, which supports Serial interfaces: RS232/RS422/RS485.
For the Serial RS485 and RS422 Interface, you need a Serial (DB9) RS485 or RS422 converter adapter.
Our item no. the SC1100 is an example of such a Serial RS232 to RS485 interface converter adapter.
SC1100 Product information:
RS232-To-RS485-Converter-SC1100
The same is applicable for the Serial RS422 interface.
Refer to the picture below, on how a Serial RS422 interface converter adapter is wired.