serial com RS422, sending hexadeximal coomands

Question

fima v 2017-11-27

编辑： Walter Roberson 2017-11-28

Hello,i am trying to communicate with a "reciever" device which is connected as shown in the attached photo(serial-com).

i communicated with the device using PCOM software,as shown in the attached photo with "hexadeximal" commands.

i tried to do the same thing with matlab shown as following,

but it doesnt do anything,how to do these hexadecimal commands in matlab?

Thanks

s = serial('COM4');
set(s,'BaudRate',115200);
fopen(s);
fprintf(s,'0801')
fprintf(s,'63')
out = fscanf(s);
fclose(s)
delete(s)
clear s

Answer 1

Greg 2017-11-28

编辑：Greg 2017-11-28

'63' and '0801' in MATLAB are character arrays. The binary of '63' is not the same as the binary of 0x63. Try:

fwrite(s,uint8(hex2dec('0801')));
fwrite(s,uint8(hex2dec('63')));