EP4650 and EP5550 RS232 User Guide 1
RS232 Codes
RS232 control is not necessary for operation, but is a convenient way to control
displays from a computer at a distance. Most things you can do with the remote, you
can do with RS232 commands. Plus, you can send inquiries to the displays and find
out the current settings and values.
1 RS232 Command Format
STX (1 byte) + IDT (1byte) + Type (1byte) + CMD (3bytes) + [Value/Reply (1byte)] +
ETX (1 byte)
STX: Start byte = 07
IDT: 00 (Hex Num) for broadcast mode (no announcing, only for video wall),
01~19 (Hex Num) for single control mode.
Type: Read or Write command, 01: read/action, 02: write; 00: return to host (from
monitor)
CMD: As shown in the table on the following pages
Value: Setting Value of Write Command
Reply: Return Value of monitor
ETX: End byte = 08
Transmit from PC (Host)
Read/Action command: 07 IDT 01 CMD 08 (7bytes)
Write/Setting command: 07 IDT 02 CMD VAL 08 (8 bytes)
Return from Monitor: Return CMD is the same with received CMD, the return
command will be sent after action. In broadcast mode, no return will be sent.
Return command: 07 IDT 00 CMD REP 08 (8 bytes)
2 Serial Port Setting
Note: Baud rate can be set to 38400, 19200 or 9600 to match the monitor baud rate setting.
Baud Rate Data Bit Parity Bit Stop Bit
115200 8 None 1
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