FHD552-X LCD Panel User Manual
50
020-000741-01 Rev. 1 (07-2014)
External Control
In addition to using the display keypad or remote control unit, you can control the display using a
serial (RS232/RS485) link to send ASCII commands and receive responses to those commands.
You also use discrete infrared (IR) control codes to program a third-party remote control unit. For
more information, refer to
Using Discrete IR Codes
on page 62.
Serial Communications
The display uses a simple text-based control protocol to take requests from control devices and to
provide responses to such devices. This section describes how to send control messages over a
serial link between the display and an automation/control system or a PC running either of the
following:
• A terminal emulation program such as Windows
®
HyperTerminal or TeraTerm; or
• The Video Wall Toolbox, a Windows application that provides a graphical user interface that
mimics the remote control buttons, as well as the ability to send serial commands and receive
responses to those commands.
RS232 Connection and Port Configuration
Connect your control system or PC to the RS232 input of the display; refer to
Connecting a Control
System or PC
on page 24.
Configure the RS232 controller or PC serial port as follows: no parity, 8 data bits, 1 stop bit and no
flow control. Set the baud rate to 115200, to match that of the display RS232 port.
Command and Response Format
Commands sent from an automation/control system or PC to the display must have this format:
[STX] [IDT] [TYPE] [CMD] ([VALUE] or [REPLY]) [ETX] [CR]
Where:
•
[STX]
indicates the start of the command data (always 07).
•
[IDT]
is the display ID Use hexadecimal values 01 to 19 inclusive to address a single display.
Use 00 to broadcast a command to all panels in a video wall.
•
[TYPE]
is the command type:
•
00
= return to host (response from the LCD panel)
•
01
= read/action
•
02
= write
•
[VALUE]
is the parameter setting for the command.