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8 x 8 HDMI Matrix Switch RS-232 Protocol Manual
RS-232 Protocol and Command
RS-232 Cable Pin Lines
Matrix Switch RS-232 pins out, PC RS-232 pins,
DB9 female connector DB9 male connector
Not connected 1 ----------------------------------------------------------------------------- 1 Not connected
TX 2 ----------------------------------------------------------------------------- 2 RX
RX 3 ----------------------------------------------------------------------------- 3 TX
Not connected 4 ----------------------------------------------------------------------------- 4 Not connected
GND 5 ----------------------------------------------------------------------------- 5 GND
Not connected 6 ----------------------------------------------------------------------------- 6 Not connected
Not connected 7 ----------------------------------------------------------------------------- 7 Not connected
Not connected 8 ----------------------------------------------------------------------------- 8 Not connected
Not connected 9 ----------------------------------------------------------------------------- 9 Not connected
1. Transmission rate: 9600 bps
2. Data format: 8 data bits, no parity, 1 start bit, and 1 stop bit
3. Flow control: None
Also known as 9600, 8, n, 1.
Data String Format
The Data String contains four elements:
[Command][ ][Data][;]
The format is:
1. Command
2. Space
3. Data
4. ;
There is a single space after the Command and before the Data string. The data string must conclude with a semicolon “;”
(without the quotes). All text is full ASCII Code and is NOT case sensitive. You can use either capital letters or lower-case letters
and get the same result.
The LINK command must be sent first. This establishes a communications link between an external controller or computer and the
device you want to control. When you have an established link, communication via the IR port is disabled. The front panel remains
operational.