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Fabri
Joined: 22 Aug 2005
Posts: 275
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| Echo in Rs485 |
 Posted: Fri Oct 10, 2014 8:46 am |
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Hi to All,
I want to drive RS485 modem with AT command. When I send command in received buffer I have also echo of tx instead only answer from modem.
This is example:
| Code: |
/****************************************************************************
* main.c *
*---------------------------------------------------------------------------*
*/
#define debug
#include "18F46K22.h"
#include "DEF452.C"
//_______________________________________________________________________Setup
#if defined(debug)
#fuses HSM,NOPBADEN,DEBUG,NOWDT,NOPROTECT,NOPUT,NOBROWNOUT,CPD,NOLVP,NODEBUG,NOCPB,STVREN,NOPLLEN,NOFCMEN
#device ADC=10 icd=true
#else
#fuses HSM,NOPBADEN,NODEBUG,WDT,PROTECT,PUT,CPD,NOLVP,BORV29,CPB,STVREN,NOPLLEN,NOFCMEN
#device ADC=10
#endif
#device *=16 ADC=10
//______________________________________________________________Abilita Delay
#use delay(clock=16000000,RESTART_WDT)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7,enable=PIN_C5,restart_wdt,errors,stream=MODEM)
char buffer_rx[200];
int counter_rx;
#USE FAST_IO(A)
#USE FAST_IO(B)
#USE FAST_IO(C)
#define true 1
#define false 0
#INT_RDA
void SerialInt()
{
buffer_rx[counter_rx]=fgetc(MODEM); // Gets chars from uart
counter_rx++; // Increment counter
if(counter_rx>=200)
counter_rx=0; // Circle Buffer
}
void main() {
set_tris_a(0b00000001);
set_tris_b(0b01000000);
set_tris_c(0b10000000);
set_tris_d(0xFF);
set_tris_e(0x00);
PORTA=0;
PORTB=0b11000000;
PORTC=0;
PORTD=0;
PORTE=0;
setup_timer_0(RTCC_DIV_64|RTCC_INTERNAL|RTCC_8_BIT);
enable_interrupts(INT_RDA);
enable_interrupts(GLOBAL);
/* Setup iniziale inverter */
while(true){
restart_wdt();
buffer_rx="";
counter_rx=0;
printf("AT\r"); // Send Attention Command
delay_ms(2000);
delay_cycles(1);
}
}
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I tried to change manually enable of RS485 driver without solve problem.
Can somebody help me to solve this problem ? |
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ezflyr
Joined: 25 Oct 2010
Posts: 1019
Location: Tewksbury, MA
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| Posted: Fri Oct 10, 2014 10:51 am |
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Hi,
Are you sure it's not the modem echoing the Rx data? Most AT command 'modems' will do this by default, but this feature can be disabled. Here is how I disable command echoing on an ADH8066 GSM modem based project:
| Code: |
// Here we turn OFF AT command echoing from the ADH8066 module!
fprintf(ADH8066, "ATE0\r");
delay_ms(500);
|
John |
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Fabri
Joined: 22 Aug 2005
Posts: 275
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| Posted: Fri Oct 10, 2014 11:10 am |
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Thanks John,
After now "ATE0\r" I don't receive "AT" echo.
I didn't think about it because with PC and terminal I haven't echo. I can't realize it why.
Anyway I solved it !
Regards,
Fabri |
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temtronic
Joined: 01 Jul 2010
Posts: 9237
Location: Greensville,Ontario
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| Posted: Fri Oct 10, 2014 12:44 pm |
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| Ok maybe I'm blind from welding today but just where do you actually print out the received data from the modem ?? |
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Fabri
Joined: 22 Aug 2005
Posts: 275
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| Posted: Fri Oct 10, 2014 1:04 pm |
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Dear temtronic,
This is only for test and I use ICD3 in debug mode. I don't printout received data. I only watch received buffer in MPLAB. |
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