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nicenoise
Joined: 10 May 2004
Posts: 17
Location: barcelona
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| comunication problems with GSM Modem TC35i |
 Posted: Wed Oct 04, 2006 6:12 am |
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hello,
i have a big problem... i dont understand what's happend with this system!!!
i'm trying to connect the TC35i siemens gsm modem to the pic18f452 CCS development kit with the serial cable!!!
the conection with the terminal and modem is good!!!
the conection with the terminal and the pic is good!!!
but the conection with the pic and the modem dosent works!!!!!!!!
this is my code!!!!
if i receive something to the buffer,
the yellow led connected to B4 blinking with every caracter received!!!
| Code: |
#include <18F452.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=19200, xmit=PIN_C6, rcv=PIN_C7, PARITY=N, BITS =8 ) // Jumpers: 8 to 11, 7 to 12
#define BUFFER_SIZE 32
BYTE buffer[BUFFER_SIZE];
BYTE next_in = 0;
BYTE next_out = 0;
#int_rda
void serial_isr() {
int t;
buffer[next_in]=getc();
t=next_in;
next_in=(next_in+1) % BUFFER_SIZE;
if(next_in==next_out)
next_in=t; // Buffer full !!
}
#define bkbhit (next_in!=next_out)
BYTE bgetc() {
BYTE c;
while(!bkbhit) ;
c=buffer[next_out];
next_out=(next_out+1) % BUFFER_SIZE;
return(c);
}
void tx_data(void)
{
putc(65); // Transmit "AT" through serial port
putc(84);
putc(13);
putc(10);
}
void main() {
enable_interrupts(global);
enable_interrupts(int_rda);
printf("\r\n\Running...\r\n");
output_low(PIN_B5);
do {
tx_data();
delay_ms(1000);
//printf("\r\nBuffered data => ");
while(bkbhit){
putc( bgetc() );
output_low(PIN_B4);
delay_ms(50);
output_high(PIN_B4);
delay_ms(50);
}
output_high(PIN_B4);
} while (TRUE);
}
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it's possible the problem are the pins DSR and CTS???
there isn't connected in the minijack-232 cable of the kit!!!
this pins put on when i connect the modem to the terminal,
but not put on when i connect the pic to the terminal,
i need help!!!!!!
please!!!!
thanks,
Alex  |
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asmallri
Joined: 12 Aug 2004
Posts: 1635
Location: Perth, Australia
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| Posted: Wed Oct 04, 2006 6:56 am |
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| Quote: | | the conection with the terminal and modem is good!!! |
Terminal == DTE, Modem == DCE, Problem = No
| Quote: | | the conection with the terminal and the pic is good!!! |
Terminal == DTE, PIC == DCE, Problem = No
| Quote: | | but the conection with the pic and the modem dosent works!!!!!!!! |
PIC == DCE, Modem == DCE, Problem = YES
_________________
Regards, Andrew
http://www.brushelectronics.com/software
Home of Ethernet, SD card and Encrypted Serial Bootloaders for PICs!! |
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nicenoise
Joined: 10 May 2004
Posts: 17
Location: barcelona
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| Posted: Wed Oct 04, 2006 7:40 am |
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hello,
but,
how can i convert a DCE (Data Communications Equipment)
into a DTE (Data Terminal Equipment)???
i don't understand where is the difference...
thanks...
alex |
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asmallri
Joined: 12 Aug 2004
Posts: 1635
Location: Perth, Australia
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| Posted: Wed Oct 04, 2006 7:53 am |
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You need a different cable. The first two use a straight thru cable. The last option requires the transmit and receive pins to be transposed.
_________________
Regards, Andrew
http://www.brushelectronics.com/software
Home of Ethernet, SD card and Encrypted Serial Bootloaders for PICs!! |
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nicenoise
Joined: 10 May 2004
Posts: 17
Location: barcelona
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| Posted: Wed Oct 04, 2006 9:47 am |
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thanks,
now it's working!!!
alex |
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