01. HDMI matrix 414H-R communication method
Serial port standard: baud rate 9600, 1 start bit, 1 stop bit, no parity
Other DTU modules need to comply with serial port standards to convert serial ports
02. HDMI matrix 414H-R ASCII format protocol
X*Y! （ X Represents the input channel，Y Representative output channel） ：Input X switch to output Y
Example: 01*02! Indicates that 01 input is switched to 02 output
The HDMI matrix 414H-R is compatible with the following protocols:
| Protocol format | For example | |
| XVY% | 01V02% | 1 Enter>>2 Output |
| 01VNN% | 1 Enter>>All output | |
| XVY. | 01V02. | 1 Enter>>2 Output |
| 01VNN. | 1 Enter>>All output | |
| X*Y! | 01*02! | 1 Enter>>2 Output |
| 01*NN! | 1 Enter>>All output | |
| X*Y% | 01*02% | 1 Enter>>2 Output |
| 01*NN% | 1 Enter>>All output | |