i can not get this to work. I want to send the message "44V" by serial, through the MAX232 to the pioneer receiver RS232, with xon/xoff -> how do I code that in arduino (i.e. if i connect by putty and writes 44V and press return the pioneer changes volume to the level I want - 9600 baud, 8 data bits, 1 stop bit, None Parity, XON/XOFF)