How to write command from Arduino to another device via RS232?

Projects Programming
23

Robin2:
The structure of a command seem to be

4.2.1 Send command

I send command to card dispenser as

byte my_serial_bytes[]={0x02, 0x44, 0x43, 0x03, 0x06};

Serial.write(my_serial_bytes,sizeof(my_serial_bytes));
Serial.write(0x05);

but do not get a responce.
i ask manufacturer about this