Hi Mahmood.

You mentioned TB62706BFG and RS485. Sure, you need some MCU in between, for UART, processing, and generating ENABLE, CLOCK, LATCH and SERIAL-IN (signals for the LED driver).

I would send the data string to be shown over the RS-485 quite often (1 or 2 per second, for example) adding CRC at the end of the string. Or a simple check sum, if you like to keep it simple. I probably would use Modbus protocol, because I am quite familiar with it.

Packets received with correct CRC (or check sum) will be processed by MCU and loaded into the TB62706BFGs.

Daniel