HP LD4730 and LD4730G LCD Ultraslim Bezel Digital Signage Displays Command Reference Guide

Command reference
This chapter gives the information needed to send control commands to the display from your own
programs. Use the RS-232-C port for transmitting and receiving commands.
Connecting the cable
Use this method if you want to connect several products to a single PC so that all displays can be
controlled at once.
Connect the RS-232-C cable as shown in the following illustration. The RS-232-C protocol is used for
communication between the media player/computer and the display. You can turn the display on/off,
select an input source or adjust the OSD menu from the media player/computer.
Figure 1 Daisy chain
RS-232C
(CONTROL)
OUT
IN
RS-232C
(CONTROL)
OUT
IN
RS-232C
(CONTROL)
OUT
IN
RS-232C
(CONTROL)
OUT
IN
1 2 3 4
RS-232-C configurations
7-Wire configurations
(Standard RS-232-C cable)
3-Wire configurations
(Not Standard)
media
player/
computer
Display media
player/
computer
Display
RXD 2
3TXD RXD2 3TXD
TXD 3
2RXD TXD3 2RXD
GND 5
5GND GND5 5GND
DTR 4
6DSR DTR4 6DSR
DSR 6
4DTR DSR6 4DTR
ENWW Connecting the cable 1