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I think that the PROBLEM is the INTERFERENCES between transmissions. If I connect only a Master and slave the sistem works OK but If I connect other slave the sistems works rarely. The protocol that I ...

a google visit to search:

MODBUS 485

might profitably guide your thoughts

also see MODBUS_xxx drivers in the CCS folder

I think that the problem is my code but I follow the code like say ...

Hi Salfer,

To share an image, you need to upload it to a free hosting site and then post the link.

Creating a 'micro' RS485 network on a breadboard should be pretty trivial even if you complete ...

For correct RS-485 network you need the 120R PLUS a pullup (on A)and pulldown(on B) resistor ,usually 4K7, though that depends on the make/model of RS-485 interface chip. If you don't follow the specs ...

Since your hardware seems to work( master and one slave is OK), then probably it is your software that has problems. You should post the code for both master and slaves for others to test.
CCS does s ...

Hi everyone! I have a doubt using MAX485. I Use three pics with three MAX485. Each pic use a MAX485.

Mi protocol is:

-The first pic request a answer of the other two pics (Pin RE/DE high and, ...

The code now works OK. I installed a new version of CCS and redefined the variables and the code now works ok. Thanks everyone.

The problem was the version. If I use CCS 5.015 code works OK. But the value of ADC not change. I need clear de adc before read adc?

I suggest you 'revector' the print.

Code as:

void putc_gie(char chr)
{
putc(chr);
enable_interrupts(GLOBAL);
}

//then where you printf
printf ...

#fuses HS, NOWDT, NOLVP, NOBROWNOUT, NOPROTECT, PUT, INTRC_IO
#use delay (internal=8MHz)
#use RS232(UART1)

Which are you using, a xtal or the internal osc.?
Specify one or the other ...

Then a few comments on coding style:
- Please check the formatting of your code. It is now difficult to read because indentation for the lines is using different styles and sizes everywhere.
- Pleas ...

Several other comments though:

#include <16f88.h>
#device ADC=10
#fuses HS, NOWDT, NOLVP, NOBROWNOUT, NOPROTECT, PUT, INTRC_IO
#use delay (internal=8MHz)
#use RS232(UART1, E ...

try removing this line from your handler

clear_interrupt(INT_RDA);

the CCS code does it FOR you at the end of the function

also you might try to test that the pointer in the handler does not ...

try removing this line from your handler

clear_interrupt(INT_RDA);

the CCS code does it FOR you at the end of the function

OK but the program continue without work :( I'm very worried I ha ...

Hi everyone! I have a big problem with serial interrupt (#INT_RDA) because my program enter in this interrupt the first time but don't enter the second time.

I don't know if the problem is the ver ...