HP LD4235 41.92-inch LED Digital Signage Display - Manual (Page 87)

12 Controlling multiple products
Use this method to connect several products to a single computer. You can control several products at a time
by connecting them to a single computer.
In the Option menu, Set ID must be between 1 and 255 without being duplicated.
Connecting the cable
Connect the RS-232C cable as shown.
The RS-232C protocol is used for communication between the computer and product. You can turn the
product on/off, select an input source or adjust the OSD menu from your computer.
RS-232C configurations
Connecting the cable 77