Hi all,

I try to write a function that can use 2 parameters and send a command to a Russound ST2 tuner.

The command is like that :

"\xF0\x00\x7D\x00\x00\x00\x70\x05\x02\x01\x00\x02\x01\x00\x3A\x00\x70\x00\x00\x00\x01\x28\xF7";

Source Number = On byte 4 and 19
Command = On byte 15


My problem is I can calculate the checksum but how can I put it on my command, I have try different concatenation without success. An ID ?

And the answer is ...
this.sendCommand = function(cmd)
{
src = CF.widget("_SOURCE_", "PARAMETERS", "ST2").label;
chk = 0xF0 + 0x7D + (src-1) + 0x70 + 0x05 +0x02 + 0x01 + 0x02 + 0x01 + cmd + 0x70 + (src-1) + 0x01 + 21 ;
chk = chk & 0x7F;
var command = "\xF0\x00\x7D" + String.fromCharCode(src-1) + "\x00\x00\x70\x05\x02\x01\x00\x02\x01\x00" + String.fromCharCode(cmd) + "\x00\x70\x00" + String.fromCharCode(src-1) + "\x00\x01" + String.fromCharCode(chk) +"\xF7";
serial.match(command,"\xF7",250);
};
this.PWOn = function() { this.sendCommand(0x3A); };