Writing Non-ASCII keys in Serial Port

I am trying to send SMS using Matlab through a Nokia phone. I am using AT commands, and one of the commands uses ctrl+z. How can I do this in the M-file?

Thank you.

Answer 1

[Siddharth Shankar]

The value for CTRL-Z (^Z), is 26 (decimal value). So you could just try using FWRITE to send that value, in addition to all the other commands. On a side note, the value for CTRL-A (^A) is 01 and other key combinations from CTRL-B through CTRL-Y are the number in between i.e. CTRL-B (2), CTRL-C(3) etc.

[gokubori kira]

Will it matter if the code is in decimal or hex?

[Siddharth Shankar]

If you're transmitting in HEX, then you need to convert 26 to its HEX equivalent, which I believe is 1a. I don't think it would matter how you transmit it, at the end of the day, the bit sequence is the same.

[Walter Roberson]

Yes, it would matter. The AT command set does *not* want to be sent hex.

You can construct ^Z as part of a string by using char(26) . If you are using sprintf or fprintf then you can code \x1a

[Siddharth Shankar]

I'd take Walter's advice on this one, I know nothing about "AT commands". In general though, for example, communicating with an instrument via the serial port, it wouldn't matter.

[gokubori kira]

Thanks to both of you. To conclude, I can use,e.g., fprintf(s,'\x1a') to make a ^Z command?

[Siddharth Shankar]

Not quite. IF you do want to send in hex and it is OK to do so, then refer to this solution: http://www.mathworks.com/support/solutions/en/data/1-61RAJP/?solution=1-61RAJP

Note that FPRINTF also sends a "terminator" character (new line, carraige return, or anything else you may have configured) to the instrument after the message that you have specified.

[gokubori kira]

OK, thanks.

[Bhargav K Naidu]

I am working on a similar project, my code is not working can anyone please help me over and the code used by me is :

ss=serial('COM7');
ss.baudrate=9600;
fopen(ss);
ss.Terminator = 'CR'
tx ='AT';
tx1=char(13);
tx2 ='AT+CMGF=1';
tx3 ='AT+CSCS="GSM"';
tx4 ='AT+CMGS="=[phone]"';
tx5 ='water';
tx6=char(26);
fprintf(ss,'%s',tx);
fprintf(ss,'%s',tx1);
pause(1);
fprintf(ss,'%s',tx2);
fprintf(ss,'%s',tx1);
pause(1);
fprintf(ss,'%s',tx3);
fprintf(ss,'%s',tx1);
pause(1);
fprintf(ss,'%s',tx4);
fprintf(ss,'%s',tx1);
pause(1);
fprintf(ss,'%s',tx5);
pause(1);
fprintf(ss,'%s',tx6);