RGBLink VSP 3500 User Manual - Manual (Page 80)

5. Communication Software Guideline
How to control processor through RS232?
VSP 3500 User Manual 80
Software is default serial connection, first time user has to set serial port.
Interface left bottom display , after serial port setup finished,
click the button , serial displays button after successful
connection, it displays on left corner, which means that the
connector has already been connected with video processors, and you
can control video processor through the PC software.
Note
If power off during communication, should close
the port , by first, and plug in out of the USB
and do communication.