Christie FHD651-P, Руководство пользователя

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FHD651-P and FHD651-T LCD Panels User Manual 39
020-000693-01 Rev. 1 (02-2014)
External Control
In addition to using the display keypad or remote control unit, you can control the display using a
serial (RS232) link or Ethernet connection to send 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 46.
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 a terminal emulation
program.
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 12.
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 the following
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 (always 01).
•
[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.
•
[REPLY]
is the parameter setting for the command, acknowledged by the display in its response
to a command.
•
[ETX]
indicates the end of the command data (always 08).
•
[CR]
is the ASCII carriage return key (0x0D).