Search found 39 matches

Thank you very much for you help, i solved it by changed code in programs (changed library).

Regards,
huynhhai

I can use macro to write code on command #define such as output_toggle(),

Regards

Hi Everyone,

I had one a hardware, now i want to write code to use it, (my PIC16F886)
in the define line: #define led PIN_C5

the code in my program:

output_high(led); --> PIN_C5 will co ...

Thanks Ttelmah,

Now, my system with modbus are running good and no error, i checked all issue after my project as below:
1. If Slave board, i can use TTL to RS485 module (only two pin TX and RX) b ...

Thanks for your help,

I found out the reason for master can not transceiver to slave due to opto isolate, from master PIC board have used Opto EL817 ( this is photo transistor NOT IS A LOGIC PHOTO ...

Dear Ttelmah, alan

I removed resistor already but unsuccessful.
I will change my module with DE and RE module to test again.
When the master sent data to slave, i observed led TX signal blinking ...

Dear Ttelmah,

This module i got from supplier of china,
https://shopee.vn/Module-TTL-to-RS485-i.104103144.4673294905

At the moment in my boards i used TTL to RS485 ( mean no pin DE and RE ) wh ...

Today, i tried to increase the time timeout =100ms reponse to connect master and slave, and the time read data between two slaves is 10ms.
At the time i used delay to read data from master to slaves ...

please see module rs485

1. USB module
https://1drv.ms/u/s%21AlOlL_PaiWSVj5MB2oLId4VypF93oQ?e=xtltKy

2. rs485 module on PIC board
https://1drv.ms/u/s%21AlOlL_PaiWSVj5MCEyX0VSC9GF9AoQ?e=rvbcqm

Thanks dluu13,

The Master i put middle of the string,
and i used module usb to rs485 to tested at the same position with pc modbus poll tool is ok.

Dear dluu13, Ttelmah

For network i used "backbone with stubs" about 9 slave and 1 master.
I connected with two resistors 120 ohm the end of two lines.
I tested the baudrate to 1200bp ...

Thank you very much,

For cable i used Altek cable 22AWG 1 pair shield, about 9 slaves (read status run-stop) and 1 master.
The master read step by step from slave 1 to slave 9, the time for read ...

Hi Every one,

I had two boards, 1 master using PIC18F67K22 and 1 Slave using PIC16F887. To read input, i wrote code as example "ex_modbus_slave.c " and "EX_MODBUS_MASTER.C ", t ...

touch7843.c file

#include <touch7843.h>
#include <tft320qvt_9341.h>

int16 vx=15489,vy=11106;
int16 chx=199,chy=3871;

struct tp_pix_ tp_pixad,tp_pixlcd;

int8 tpstate ...

Hi everyone,

i used PIC18F4620, hardware as config in software

main.h file
//--------------------------------
#include <18F4620.h>
//STATUS = FD8H
#device PASS_STRINGS=IN_RAM
#devi ...