RS232 device problem

[David]

I have a problem problem with a serial reader that I've connected with a PIC 18F452.

It's working very well with my PC using this program :

OPEN "COM1:9600,N,8,1,RS,OP,CD0,DS0" FOR RANDOM AS #1

PRINT #1, CHR$(27); CHR$(69)

but I tried this program and many others commands too and it doesn't working because the reader seems to not receive the command (printf, ("%C%C"),...).

void main() {

int a, b;

a = 0x1b;
b = 0x45;

delay_ms(500);

putc(a);
putc(b);

while(1);
}

Do you think it'd be about a voltage problem on the RX pin of the reader and I need to use a TTL/RS232 converter chip ?

Thank you for your help

Kind regards,

David

[Mark]

If the PC talks to the reader just fine and you are trying to talk to the same device with a PIC, then obviously you'll need a level translator such as a MAX232.