TCP-IP / RS485 ESP8266 converter

Compile it under Arduino 1.6.7

dktr wrote:

Compile it under Arduino 1.6.7

This is a problem in Windows XP, I worked on the topic, just type in google Windows xp arduino esp8266 bits

Info e.g. Here

thanks helped
now i have a problem with the file
es-rs485_v2.ino
Arduino: 1.6.7 (Windows XP), Tile: "Generic ESP8266 Module, 80 MHz, ck, 26 MHz, 40MHz, QIO, 8M (7M SPIFFS), 2, v2 Lower Memory, Serial, None, Only Sketch, 115200"

Project options changed, reload all
D: \ a \ ESP \ es-rs485_v2 \ es-rs485_v2 \ es-rs485_v2.ino: In function 'void setup ()':

es-rs485_v2: 19: error:'earchwifi 'was not declared in this scope

searchwifi ();

^

exit status 1
'nazwawifi' was not declared in this scope

in the file
WiFiUartTransparentBridge.ino
compilation runs smoothly

You mixed up something in the code. I downloaded pik again and it compiles without any problems.

The sketch uses 238,477 bytes (54%) of program memory. The maximum is 434,160 bytes.
Global variables use 32,532 bytes of (39%) dynamic memory, leaving 49,388 bytes for local variables. The maximum is 81,920 bytes.

I downloaded all the es-rs485_v2.ino files
what are they in the subject and I have the same in all of them
unless the arduino-1.6.7 version does not suit him

po_48 wrote:

bits / os_defines.h: No such file or directory

You're missing this file.

I used versions 1,8,5 portable and the compilation went fine, now I'm trying to upload and it can't be done

Added after 2 [hours] 10 [minutes]:

how to set up arduino go to layout from photo

why I have these errors
Arduino: 1.8.5 (Windows XP), Tile: "Generic ESP8266 Module, 80 MHz, ck, 26 MHz, 40MHz, QIO, 1M (64K SPIFFS), 2, v2 Lower Memory, Disabled, None, Only Sketch, 9600"

Project options changed, reload all
Archiving built core (caching) in C: \ DOCUME ~ 1 \ admin \ SET ~ 1 \ Temp \ arduino_cache_730353 \ core \ core_esp8266_esp8266_generic_CpuFrequency_80, ResetMethod_ck, CrystalFreq_26, FlashFreq_40, FlashMode_qio, FlashSize_1M64, LED_2, LwIPVariant_v2mss536, Debug_Disabled, DebugLevel_None ____, FlashErase_none, UploadSpeed_9600_6ab5e78c2376f2c1663435181e2f3eb0 .and
The sketch uses 250,248 bytes (26%) of program memory. The maximum is 958,448 bytes.
Global variables use 32,656 bytes (39%) of dynamic memory, leaving 49,264 bytes for local variables. The maximum is 81,920 bytes.
warning: espcomm_sync failed
error: espcomm_open failed
error: espcomm_upload_mem failed
error: espcomm_upload_mem failed

COM port visible in the system? selected this port in ArduinoIDE? If the port is present, is there any activity when trying to program? (led RX / TX)? The 3.3V from this programmer on some boards has too low current efficiency, what do you power it with?

port visible LEDs are flashing
3.3v power supply given separately

Added after 4 [minutes]:

in ESPlorer, communication is two-way and in ArduinoIDE as if only one stone

Added after 23 [minutes]:

in ArduinoIDE I am sending in the serial port monitor I am sending node.info () and I do not receive a response
reaction to physical reset
NodeMCU 0.9.6 build 20150406 powered by Lua 5.1.4
lua: cannot open init.lua

It looks like you would not connect GPIO0 to ground before programming and ESP is still lua and not soft from the thread.

it seemed to me that the gpi00 short circuit is used for flashing

Added after 14 [minutes]:

and this is where the dog was buried, but these are the mistakes of someone who starts playing with andruino, thanks for the help

uzi18 wrote:

george2002 wrote:

Is it something like esp-link? https://hackaday.io/page/1304-virtual-serial-port-tunnel-to-use-with-esp-link " target="_blank" rel="nofollow noopener ugc" class="postlink inline" title="" > https://hackaday.io/page/1304-virtual-serial-port-tunnel-to-use-with-esp-link because esp-link has a lot of options, only the RS485 support is probably not implemented from what I read quickly
How about stability? and it works at what speeds and whether they can be changed easily or the code needs to be uploaded to esp8266 to make it different ?

There is an esp-link latka with rs485 support, you have to look at repo / issue

Unfortunately, I did not manage to make this version work ...
However, it worked from https://github.com/pvvx/esp8266web

I know I'm digging up an old thread, but I'm looking for information to control.
I am trying to make a link from the pro-vent recuperator to domoticz on the basis of your program, but somehow it does not work for me. First of all, I don't know how to master the device addressing.
Is your link transparent to the device? This would mean that I have to give an address on domoticzu. How is the end of the bus terminated?
Second, when I tried to connect to the driver in parallel, the driver kept crashing errors. I have a manual for a recuperator and the addresses are described there - but I must admit that I do not understand rs485 too much.
I use a converter like yours.

You must bear in mind that RS485 is a topology / type of network when it comes to equipment, and what you put on it, e.g. modbus, is a completely different pair of wellies.

Yes, I know that rs485 is a hardware protocol and modbus is software.

write to PW then maybe I can help, let's not clutter this thread, just describe exactly what equipment you have

Using a different adapter (in the picture) you can use any software that supports the TTL serial port.

I used ESP-Easy.
The author of the thread wrote the software itself, but I preferred to use the ready one with the web panel and other features.
But I did not find an ESP software that would support the DE pin used for RS485 transmission signaling (because it is half-duplex).
Therefore, you need to buy an adapter that is not the usual MAX3485, and additionally converts serial full-duplex transmission to half-duplex.

You can also connect any additional sensors to esp-easy as you need.

levy^ wrote:

modbus is a completely different pair of wellies

https://www.elektroda.pl/rtvforum/topic3385209-90.html#19386913

Here is perhaps the easiest way to program modbus in python.

dktr wrote:

ESP8266 programmed in ArduinoIDE

What libraries should be included to compile it? I don't use arduino at all so forgive the question. It is about:

Quote:

fatal error: ESP8266WiFi.h: No such file or directory

Probably the next library will also not be known #include
P.S. Once I tried to run anything on these wifi modules and I downloaded a lot of different libraries, when I entered the name of this file in the add-ons, despite the installation of several libraries from the list, I still have the same problem. I'm using Arduino IDE 2.00 on windows 7 and it's very unstable... so maybe that's the problem?

P.S. I'm pretty green when it comes to wifi etc. I'd like to connect my air handling unit (airpack home4) to the network first. What next, once I start this converter and connect the control panel to it (I'm going to plug into the same wire that goes to the Air++ panel, after all it's a modbus sort of ... )

First you need to add the URL to the board manager in the preferences, then you need to add the ESP8266 in the board manager and then select such a "board" from the menu tools -> board

I skipped Arduino IDE, compiled your program with VSC+PlatformIO and uploaded to NODE MCU V3. In the terminal I got to "going to UART mode BRIDGE10.10.10.89" What's next ? Is this bridge 2 sided? Can I send something to the ESP8266 / its uart and read the same, from where, a browser or maybe some ready-made program on a PC?
For now, I have not connected anything to the NodeMCU board, at the beginning I would like to connect it via FTDI FT232 to another port on the computer and test the communication strictly.

Yes, it is two-sided, under linux you can use socat, under windows I don't know, there is probably some equivalent

Hi,

I tried to use this solution to read information from the controller on modbus address 1 19200 8n1 connected to VEMOS d1 mini via Max485.

I use the TX RX pins for communication and D2 (GIPO4) for DE/RE,
Communication physically checked, I read variables from the controller using VEMOS as Modbus Master.

I am connected to RS485 communication with an oscilloscope and what I noticed is that the communication frame is too long and some TCPIP is also sent via Modbus RTU (photo below).

The controller does not respond to reading Holding from address 9143.
Does anyone have an idea what could be the problem?

>>21046592

Kicauke wrote:

I use TX RX pins for comm and D2 (GIPO4) for DE/RE,

I don't know if this is where the problem lies because I'm a mega layman and will just be doing my first project, but I was just looking for answers on which pins to use on the wemos d1 mini to connect the MAX485 / RS485 Module TTL?

From what I understand you have connected on the Wemos to TX, RX and D2 (GIPO4). Maybe here is the problem?

Here is the documentation for the Wemos D1 Mini (https://lastminuteengineers.com/wemos-d1-mini-pinout-reference/):


And here a wiring diagram found on the web. D7 (GPIO13) <-> DI (RXD) | D5 (GPIO14) <-> RO (TXD) |
Is this ok and is this the best way to do it?


The last thing is the power supply. The MAX485 module on the page where I bought it is described as running on 5V. It says so here too. https://www.robotistan.com/ttl-rs485-serial-converter-board-max485

All the schematics I see (including the one I attached) give a voltage of 3.3V???? Thanks for the info if it shouldn't be 5V.

>>21046592 .

bo.... this is not well described...

You have two MODBUS communication modes: ascii and binary (RTU) - but this is what sends the computer directly via serial to the RS485 chip (module) and then flies down the bus and to the devices. Some devices do not support ASCII....

There is a lot of software that communicates with MODBUS devices via TCP.... and this is where the extra sender data is added.

But. If you have an esp8266 with a connected module that does a "simple/straight" wifi->rs485 proxy - then:
- you have to connect over tcp/ip to the esp8266 address
- but you have to send a "bare" modbus_RTU.

This is what, for example, the python code quoted here does via "socat" - socat pretends to be a serial - but sends the data on under the ESP IP.

I didn't like this solution terribly much - and since I don't write in python - and prefer perl, I found this solution:
https://github.com/sourceperl/MBclient/blob/master/lib/MBclient.pm

perl connects immediately to the ESP's ip address and sends a "clean/ naked" MODBUS_RTU frame.

A whole program to read the current power consumed - I read the ORNO-WE-504 meter:

#!/usr/bin/perl

use strict;
use MBclient;

my $EX=0;
my $m = MBclient->new();
# define server target
$m->host("192.168.1.87");
$m->port(8888);
$m->unit_id(1);
$m->mode(MODBUS_RTU);
$m->{debug}=0;
#$m->timeout(45);

# current power consumed - watts
my $words = $m->read_holding_registers(3, 1);
if( $words ne undef ) {
printf( "%un", @$words[0] );
} else {
printf( "undef" );
$EX=1;
}

# clean exit
$m->close();
exit $EX;