Christie FHQ841-T Manual de usuario descargar pdf (Pagina 39)

FHQ841-T LCD Panels User Manual 39

020-000735-01 Rev. 1 (06-2014)

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.

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 20. 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 19200bps, 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:

Direct Command Format (from computer)

• Format : [HEAD][SET ID][COMMAND][END]

• Example (Power on) : [K:][ALL][PON][.]

• [HEAD] indicates the start of the command data (always K:).

• [SET ID] is the display ID (always ALL).

• [COMMAND] is the command data (3Bytes).

• [END] indicates the end of the command data (always .).

Value Adjust Format (from computer)

• Format : [HEAD][SET ID][COMMAND][VALUE][END]

• Example (Volume level 50%) : [K:][ALL][PON][050[.]

• [HEAD] indicates the start of the command data (always K:).

• [SET ID] is the display ID (always ALL).

• [COMMAND] is the command data (3Bytes).

• [VALUE] is the parameter setting for the command (000~100).

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Christie FHQ841-T Manual de usuario Pagina 39