Like above picture, connect COM1/RS232 (9pin D-Sub) in Device menu and configure Serial and Text.
Serial (COM1) Setup
1. Select “Device” in OSD menu and move to sub menu.
2. Selecting COM1 and configure “Text” in Device
3. Setup the value of Baud Rate/Parity/Stop bit/Data bit with the device.
Text Setup
1. Select “Deice” on OSD, and move to sub menu.
2. Select “ Text” and configure relevant text information