Problem in Serial Port Communication

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If I write like below it goes perfectly to device at other end

C++

char ch[18] = {0x01,0x01,0x01,0x02,0x00,0x01,0x01,0x0C,0x05,0x00,0x01,0x01,0x55,0x55,0x55,0x55,0x55,0x77};
 pPortInterface->;Writechar(ch);

But if I write like below it does not go

C++

char ch[18];
	ch[0]= '0x01';
	ch[1]='0x01';
	ch[2]='0x01';
	ch[3]='0x02';
	ch[4]='0x00';
	ch[5]='0x01';
	ch[6]='0x01';
	ch[7]='0x0C';
	ch[8]='0x05';
	ch[9]='0x00';
	ch[10]='0x01';
	ch[11]='0x01';
	ch[12]='0x55';
	ch[13]='0x55';
	ch[14]='0x55';
	ch[15]='0x55';
	ch[16]='0x55';
	ch[17]='0x77';

	pPortInterface->Writechar(ch);

I want to assign in second format as I want Variable input to device not fixed one,Please let me know how to do it

Posted 29-Nov-12 0:42am

adityarao31

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André Kraak · Accepted Answer · 2012-11-29T00:50:00

'0x01' is not the same as 0x01 (without the quotes).

For example 0x77 is a hexadecimal representation of the value 119, which in turn is character[^] 'w'.

Remove the quotes from the second format and it should work.

C++

char ch[18];
	ch[0]=0x01;
	ch[1]=0x01;
	ch[2]=0x01;
	ch[3]=0x02;
	ch[4]=0x00;
	ch[5]=0x01;
	ch[6]=0x01;
	ch[7]=0x0C;
	ch[8]=0x05;
	ch[9]=0x00;
	ch[10]=0x01;
	ch[11]=0x01;
	ch[12]=0x55;
	ch[13]=0x55;
	ch[14]=0x55;
	ch[15]=0x55;
	ch[16]=0x55;
	ch[17]=0x77;
 
	pPortInterface->Writechar(ch);