Delay is only for switch. ( no repeating ini comm ).
It does not matter for reciving !!!!!!!!
ini_comm(); // ini comm
Serial.write(0xF4);
Serial.write(0x03);
Serial.write(0x51);
Serial.write(0x0A);
Serial.write(0xAC);
When I send F4 03 51 0A AC I see response on terminal but don't see on LCD !!!