For specific command codes (like setting the ID or brightness), you can refer to the official AM03127 communication datasheet . RPI UART and Maplins N00GA or AM03127 LED Display
If the sign is glitching, use the remote control to "Clear All" (found under Funct > Setup) before attempting a new software upload. Am03127 Led Display Software Download --BEST
In your software's settings, select the correct COM port. The standard parameters are 9600 baud rate , 8 data bits, 1 stop bit, and no parity. Programming Tips For specific command codes (like setting the ID
If using a USB adapter on Windows, you must install the specific driver for the adapter's chipset (usually Prolific or CH340) before the software can "see" the sign. 8 data bits