NEC MA Series 43" 4K Commercial Display with Media Player and Raspberry Pi Compute Module 4 SoC - Manual (Page 64)

English−60
Controlling the Monitor via RS-232C
This monitor can be controlled by connecting a personal computer with an RS-232C (reverse type) terminal.
For example, some of the functions that can be controlled by a personal computer are:
• Power ON or standby.
• Switching between input signals.
• Sound Mute ON or OFF.
Connection
Monitor + computer.
• Please turn off the monitor’s main power before connecting a computer to the monitor.
• Please turn on the connected computer first then turn on the monitor’s main power.
If you turn on the computer and monitor in reverse order, the com port may not work.
• To control the monitor via commands sent from a computer connected with an RS-232C cable, please use the control
command. Instructions for the control command can be found in the “External_Control.pdf”. See page 84 .
RS-232C Cable
Computer
RS-232C
NOTEN: • If your computer is equipped only with a 25-pin serial port connector, a 25-pin serial port adapter is required.
Contact your supplier for details.
• For the pin assignment, please see “2) RS-232C input/output” on page 61 .
This monitor uses RXD, TXD and GND lines for RS-232C control.
The reverse type cable (null modem cable) (not included) should be used for RS-232C control.