ATEN VM1600 User Manual page 115

 Use the drop-down menu to select Broadcast (1-All) to broadcast
the IR/RS232 signal from one port to all ports. Use the drop-down
menu that appears to select the port that broadcasts the IR/RS232
signal.
 Out-Board: Set each output port to use the Local IR/RS232, HDBaseT
IR/RS232, or Loopback setting for the IR/RS232 signals.
 Use the drop-down menu to apply an option to all ports; or select
Local IR/RS232, HDBaseT IR/RS232 or Loopback for individual
ports.
Click Save to save the settings. Click Reset to revert to the default settings.
Note: By default the RS232 Return Path will use the lowest port number
available for a connection. This setting can not be changed.
Chapter 4. Browser Operation
103