Arduino modbus rs232. 1 Display Oled 128 x 64 I2C.
Arduino modbus rs232 I’ve decided to use JZ20-R16 as a Master (Arduino as a Slave) in a 9600 baud 8N1 configuration (default for JZ20-R16). 1). com/p/simple-modbus/ Modbus RS-232 Allows Concurrent, Full-Duplex Flow of Data. I have attached the code, communication guide and parameters. The Modbus is a master-slave protocol used in industrial automation and can be used in other areas, such as I'm trying to read the battery voltage and other data via it's RS232 port from an ESP32 or an Arduino. - Modbus supports various communication media such as serial communication (RS-232/485) and Ethernet. Supports serial (RS-232, RS-485) and IP via Ethernet (Modbus IP). The Modbus generally uses serial RS-232 or RS-485 as physical layer (then called Modbus Serial) and TCP/IP via Ethernet or WiFi (Modbus TCP). I am trying to implement the Modbus ASCII here but reading and writing both is not happening. It allows devices operating at different voltage levels to communicate. It gives only 0 for each item of the received data array au16data[]. Share. DT0 = Hello everyone faced such a problem, there are two arduino, configure the modbus protocol, I encountered that the master sends requests to the slave, but slave does not receive them. Arduino uses 8 bit, parity none, stop bit 1 by default and so does this relay RS-232 or RS-485 converter, where the full duplex RS-232 converter is easier to install; a MODBUS library that allows to transmit commands to and receive data from your device. What I've figured out so far: Learn: How to use ESP32 Modbus library, what is Modbus, why needs Modbus, how Modbus works, how many types of Modbus, and Modbus RTU/ASCII, Modbus TCP. I was attempting to connect the Arduino Modbus slave to the ZigBee to rs232 converter. begin(9600, SERIAL_8O1) but it gives the same result, as it is shown in the image. With EASYtransfer library everything works, but modbus is needed Master /** * Modbus master example 1: * The Modbus supports various communication media such as serial communication (RS-232/485) and Ethernet. Relays could be controlled via the internet connection on the relay board. Modbus communicates over several types of physical media such as RS-232/RS-485 or Ethernet. Updated to support Arduino 1. Compatibility. Connected via rs485, RE DE pins are connected via 8 pin. Requires an RS232/485 transceiver. This library is compatible with all architectures so you should be able to use it on all the Arduino boards. h>). Standar MODBUS yang diperkenalkan oleh modicom (kemudian menjadi schneider) pada tahun 1979 I am experiencing a problem when trying to communicate with a Modbus slave device (ID 7) connected on Serial2 (UART#2 pin16 and pin17 of my Arduino Mega 2560). I want to use Arduino as a MODBUS TCP/IP Master (IP 192. This Arduino Modbus library seems to support Modbus f Firmware for FX3U-slave and OP320-master, communication via modbus, based on Arduino Framework. Using Serial. 8: 1258: Hi, I'm trying to interface with a Morningstar Tristar MPPT solar charge controller as a bit of a side project to complete my off-grid system. I thought it would be easy but I overestimated my skills. Connect Allows your Arduino to communicate via Modbus protocol. Connect an RS485 transceiver module (e. To see if there is data ready, 0x10 must be sent by the meter. If you like electronics, home automation, automation, programming, PLC, microcontrollers, Arduino, Python, Open source . Although for some this test is similar to previous tests, visual and functionally does not vary, but internally the library and / or the configuration as master or slave are different would be denoted by revolving the Master and Slave Modbus libraries for Arduino. Enables communication with Modbus slaves over RS232/485 (via RTU protocol). Install the library into your Arduino If you really say that someone will place an answer of distinguishing the pinout of the RJ45/RS485 and way of communication with arduino when i share the MOD BUS RTU (which is not a secret) protocol. I was able to both read a holding register from Arduino (03) and also write a register (06). Modbus over RS-485 is probably the most popular way of deploying Modbus protocol. The original Modbus interface ran on RS-232 serial communication but most of the later Modbus implementations use RS-485 because it allows for longer distances, higher speeds and the possibility of multiple devices on a single multi-drop network. I am using an Arduino DUE R3 - Serial1 port. They failed to communicate, and I found the following results by doing further testing. I've build a similar protocol, called MaCaco that allow peer-to-peer event based communication that is ##Overview## This is an Arduino class library for communicating with Modbus slaves over RS232/485 (via RTU protocol). The original Modbus interface ran on RS-232 serial communication but most of the later Modbus implementations use RS-485 Learn: How to use Arduino Modbus library, what is Modbus, why needs Modbus, how Modbus works, how many types of Modbus, and Modbus RTU/ASCII, Modbus TCP. Arduino mod bus Arduino modbus Arduino modbus rs485 Arduino rs485 mod bus modbus Arduino modbus ascii rs232 rs485 rs485 modbus rtu what is modbus. I'm trying to read the data from the controller via RS-232 however MODBUS is completely new to me and I'm struggling to understand how to read the registers. After much hair pulling, I actually got it working, but not with any of the Arduino library code 😲 Has anyone else got Modbus Slave working using the ArduinoModbus library on the GIGA? My hardware is the following GIGA (Duh!) A MAX485 RS232 to RS485 dev board, the one that Hello all, I need to get temperature data from control temperature and I have problem How to use arduino communicate with Temperature control (dixell XR20CX) by Modbus interface Communication detail modbus RS485 RS232 control temp -----> XJ485-CX -----> Interface to RS232 -----> Arduino (dixell XR20CX) Information dixell XR20CX use Modbus I want to use Arduino as a Mosbus RTU master in my project. We can use either Modbus RTU or Modbus ASCII. . My problem is that i have written a small program in Thank you very much. i need your help. It is a standard for communication between data terminal and data circuit termination equipment. 5. then the MAX485 can be correctly powered by 5v. I can observe the data in PLC through ladder logic but not in arduino. I have tried multiple codes available in internet (links mentioned bellow) . The Arduino board functions perfectly as a modbus slave when Hi all, I hope you are all doing well. Engr Fahad. The MAX232 module serves as a voltage level converter, bridging the gap between Arduino’s TTL This bundle is an equipment managment solution based Arduino framework. This library implements the Modbus protocol over two different types of transport: serial communication over RS485 with RTU (Remote Terminal Im trying to control a temperature controller using Arduino MEGA over SoftwareSerial. available captures the data sent from the PLC but when I insert the routine into the Hi, I have an AC Servo that has 10000 steps per revolution. markd833 May 16, 2022, 8:29pm 2. 1 which requires Arduino IDE >= 1. h> This PLC has Modbus RTU protocol as master and slave To configure a teacher must create a strategy, if set as slave does not require code as the default plc is a slave and records are automatically routed. Connect the two Arduino UNO Hi all , I am trying for my project to get data like (kWH,Voltage etc) form an modbus based digital electric meter through RS232 >>>> arduino UNO serial communication . Seri tulisan saya kali ini akan membahas tentang protokol komunikasi pada industri yang masih de facto menjadi standar disana. Skip to content. Arduino was configured as a slave and ModbusPoll software (Modbus Master Simulator) simulated a master. asli Kudus mas, tepatnya desa Barongan 🙂 Gini mas, kalo PLC itu biasanya pake serial sinkron RS-485 dengan protokol MODBUS, walaupun ada yg menggunakan RS-232 atau Hi all! First of all, thanks to all of you, that forum is a great resource!! Then. Here Arduino Uno has two This library allows your Arduino to communicate via Modbus protocol. Maintainer: Doc Walker. - budulinek/arduino-modbus-rtu-tcp-gateway Untuk berkomunikasi dengan perangkat RS232, Arduino membutuhkan konverter TTL ke RS232. #include <ModbusRtu. That means that data is able to flow I'm using an Automation Direct Click PLC with an Arduino UNO. The RTU variant communicates over serial lines such as UART, RS-232, or RS-485. 0x17 - Read Write Multiple Registers. The full details of the Modbus protocol can be found at modbus. 4: 19253: May 5, 2021 guidance on reading 12V + RS-232 comm. At the moment i'm just trying to make sure that my program works fine, so i'm developing it and trying to test it linking the serial output of the Arduino Mega to an There is a problem in writing the MODBUS RTU code using Arduino. And there is something happening, I don´t know why, when I upload the program both TX and RX twinkle, but when the program finishes uploading only TX is ON until I open the Serial port and it starts to twinkle (when i close it, TX The physical layer of Modbus RTU typically uses one of three types of electrical interfaces: RS-232: Suitable for short-distance communications and often used for connections between a device and a PC. Anda dapat membuatnya dari rangkaian transistor atau menggunakan IC Max 232. The code is using: https://code. Any help would be greatly appreciated! Share Add a Comment. Callback functions are provided to toggle Data Enable (DE) and Receiver Enable (/RE) pins. To use this Hi guys, I have a solar system installed at my home with an infinisolar V 5KW hybrid inverter. Relays could be controlled via RS485 using the Modbus protocol. h> is used. 168. Was this article I have used and arduino UNO with MAX485 IC for modbus. Both full-duplex and half-duplex RS232/485 transceivers are supported. The detail instruction, code, wiring diagram, video tutorial, line Since RS-232 is a serial interface, we can use it for Modbus RTU and Modbus ASCII. my blog will be a great help if you need help and information do not hesitate to consult. ; Connect the DE and RE pins of the MAX485 to one of the Arduino digital pins (often pin 2 or 3) to control transmission and reception. Are you sure about RS-232? ModBus usually runs on RS-485, both need external hardware to connect to an UNO. Arduinos prior to the Mega have one serial port which must be connected to USB (FTDI) for uploading sketches and to the RS232/485 In this case we will test with a Module ESP8266 12E Node MCU Lolin, we will use modbus slave libraries implemented in previous tutorials with Arduino Mega 2560 R3, have made new modifications to Modbus libraries to operate by a port created with the SoftwareSerial, That we will visualize in the serial terminal the data received via modbus, we will add the SoftwareSerial I am trying to communicate PLC with arduino through rs232 as well rs 485. The code developed was from smarmengol's modbus library. temperature) on a Eurotherm controller. Using TCP or RS485 shields, like the MKR 485 Shield. For that I was using ModbusRtu library and configured for Master and using Modbus poll software on PC to check the data. I used step and dir before i now want to try modbus. ON THIS PAGE. vì vậy Arduino có thể được lập trình bởi cổng Serial và Serial1 chỉ là modbus tạo điều kiện cho lập Reads data from a Renogy solar charge controller's RS232 port with an ESP32 or Arduino - wrybread/ESP32ArduinoRenogy. The Arduino sketch looks like this: /** * Modbus master example 2: * The purpose of this example is to query several sets of data * from an external Modbus slave device. Im using RS-485 serial transceiver module for interface to temperature controller and SoftwareSerial Enlighten your Arduino to be a Modbus master. However, the drawback is that This is an Arduino library for communicating with Modbus slaves over RS232/485 (via RTU protocol). Kiểm tra. You will require the following hardware for Interfacing Arduino – Modbus with Arduino. The Modbus is a master- The Modbus generally uses serial RS-232 or RS-485 as physical layer (then called Modbus Serial) and TCP/IP via Ethernet or WiFi (Modbus IP). 1 Protoboard. That might be different for a different Modbus device. I am only using the PLC to transmit integers to the Arduino and everything works fine in a stand alone routine. Lần này chúng tôi sẽ thử nghiệm bo mạch Arduino bằng cách tạo cấu hình như Master Modbus RTU qua RS232, có rất nhiều thiết bị có giao thức truyền thông này từ PLC, bộ điều khiển PID, PAC, HMI OPC, SCADA, Meters, counters giữa các thiết bị khác . Well until now I did not find an example that is plain simple to use. I have a Reader manual with command address. This is an Arduino library that implements the master/client logic of the Modbus RTU protocol. So I'm trying to make what I thought would be a simple project. The detail instruction, code, wiring diagram, video tutorial, line Enables communication with Modbus slaves over RS232/485 (via RTU protocol). I am currently struggling to This library allows your Arduino to communicate via Modbus protocol. First, the communication was successful. 0. An RS 232 cable is provided which has an RJ 45 connector on one end and an RS 232 female connector on the other. To use this How to Set Up Modbus RTU with Arduino Step 1: Wiring and Hardware Setup. This is an Arduino library that implements the slave/server logic of the Modbus RTU protocol. Arduino UNO RS-232 Rx -----> Tx TX -----> Rx 3. To get the data, send 0x20. USB Cable Type A to B – 2: 3. 1 Arduino MEGA 2560 R3. Using a C25B RS485 to TTL converter; Is my "Arduino to AC Servo" hardware setup correct? will the Code result in a spin of one revolution? The wiring is: Arduino I am trying to implement the modbus library written by smarmengol to read process values and to set new setpoints (e. In this tutorial the Arduino Uno is configured as Modbus Master by using Master Modbus Arduino coding with the help of Modbus Master library. Conforms to Arduino IDE 1. So that it should read the data from the slave controller Stanley (IP 192. In this new test we will use an Arduino Mega 2560 board and a Panasonic FPX PLC, in this case we will configure the PLC as a Modbus RTU master and the Arduino as a Modbus RTU slave via RS232. 247 for slave * u8serno : serial port (use 0 for Serial) * u8txenpin : 0 for RS-232 and USB-FTDI * or any pin Why would it be dependent on RS-485 when Modbus RTU utilizes RS-232 as well? Appreciate the help. CraigMurphy January 5, 2024, 7:16pm 1. You can adjust settings through web interface. 3v. If yes, i will immediately share. Full duplex transmission (Tx) and receive (Rx) for data occurs on different circuits when using Modbus RS-232 lines. RS-422: I'm using an Arduino board, programmed as a Modbus slave device, and a ZigBee to rs232 converter from SHJ electronics. Reads data from a Renogy solar charge controller's RS232 port with an ESP32 or Arduino - wrybread/ESP32ArduinoRenogy. 4. Arduino simple test via Modbus RTU Master to the PC via USB. Hi, I'm also a Modbus entusiast, also if is not suitable for M2M application due to its master/slave polling nature. I've bought a RS232 to TTL Converter (MAX3232). Would someone be willing to help me out a Enlighten your Arduino to be a Modbus master. [SOLVED] Using Arduino. , MAX485) to your Arduino. This library allows your Arduino to communicate via Modbus protocol. Im using Modbus-Master-Slave-for-Arduino library and I tried to test using example code below. Components and materials required for testing. This is what my code looks like (that's pretty much the A demonstration of an affordable Arduino Modbus PLC or RTU and communicate using RS232 to Mango M2M HMI. My goal is to communicate with an industrial VFD (P/N: GS2-11P0 by Automation Direct) to set output frequency over modbus RTU. That sentence was regarding the implementation of the ModBus RTU features. RS-485 – Compared to RS-232, the RS-485 has higher speeds, longer cables, and the signaling is more robust. In the request How I need it to work: PLC writes Modbus coils Arduino reads Modbus coils - I don't care if it replies or not Arduino activates LEDs ( Arduino Forum AutomationDirect PLC > Modbus IP > FastLED WS2812B. Arduino - MySQL; Arduino - Modbus; Communication between two Arduino; Arduino to Arduino MQTT Communication; Arduino - Modbus is an industrial communication protocol. Hi, I want to read data from a PLC which is communicating data on Modbus, I connected it with RS485 to RS232 converter and get the result on Modbus-slave software. google. After many trials I ended with just some boxes in Serial Monitor. LEDs and Multiplexing. I get either very weird characters (baud rate set correctly), or not logical numbers. Usage/Examples. Contribute to 4-20ma/ModbusMaster development by creating an account on GitHub. 1 converter RS-232 a TTL MAX3232 I am working on a project to communicate to use an arduino to act as a MODBUS master and connect to a RTU slave device utilizing RS-232. But it is also possible to associate the Modbus application protocol on any other physical layer, Arduino Mega 2560 Slave Modbus RTU & PLC Panasonic Master (RS232) Conclusions. I haven't found any projects t I have the Renogy Wanderer 30amp solar charge controller, which has an RS232 port. Author: Doc Walker. 1. I have connected them together using a RS232 shield using Software Serial on pins 2 & 3. i know the datasheet i read on the MAX485 is that it requires 5v, and the Giga 3. I want to describe what I define as "plain simple to use": Has an example-code where the master-code directly fits to a given slave-code which means use serial1 for the data-exchange flash master Conforms to Arduino IDE 1. 27,872 . I found the code in the internet trying to read one bit and write one bit from the Arduino to the slave. without minding the rs-485 protocoll stuff? so for example i can simply send a coilread(id, address) over the tx/rx line, without my communicationpartner receive weird bytes? thanks for your help! markd833 October 19, Relays could be controlled via the serial port, RS232 requiring one serial connection for each relay board. Our Arduino will act as a Modbus master device, In this post, we will discuss Arduino Modbus, specifically how to connect a Modbus slave device with Arduino. My problem is to get the data from the inverter. I had changed to Serial. Open comment sort options Just to be clear, RS232 protocol is -15V/+15V and arduino pins are only rated to 5v so do not under any circumstances try to directly connect the TX pin Enlighten your Arduino to be a Modbus master. ##Features## The following Modbus functions have been I tried doing some google searches but most of it was just using an arduino as a slave/master in the modbus protocol. 3. 5 Library Specification v2. fatherelectronics: Please correct me for the connection between arduino and RS-232 TTL serial interface module. However, communication is performed in the order of request -> request -> response -> request -> request -> response. firstly I need to connect with the device. The communication over serial RS-485 physical media works with two-wire transmit and receive connections. Now I also want to be able to read the meter via the Arduino. Allows you to connect Modbus RTU slaves (such as sensors, energy meters, HVAC devices) to Modbus TCP/UDP masters (such as home automation systems). Modbus via RS-232 sends data in the form of a time-series of bits. 1 Display Oled 128 x 64 I2C. This library depends on the ArduinoRS485 library. Modbus is an industrial communication protocol. 8. i'm trying to make Arduino Mega talk as MASTER with some Mitsubishi industrial stuff that implements Modbus RTU. Sort by: Best. In the request The main advantage of RS-485 over RS-232 is the multiple slaves with a single Master while RS-232 supports only a single slave. A good summary can also be found on Wikipedia. Contoh yang paling sering kita temui adalah koneksi hi, I have a project to send data to the HMI Samkoon EA-043A device and get values from HMI to the Arduino. It has two networking interfaces, TCP and RS-232. For Arduino’s RS232 interface I’ve used TTL-RS232 converter (MAX3232 based This is the code I'm testing it`s slightly edited library example: /** * Modbus slave example 3: * The purpose of this example is to link a data array * from the Arduino to an external device through RS485. so I used this code to get the connection. In order to see if the Arduino’s MODBUS feature is working I’ve connected Arduino to my PC using the given connector and a RS232-USB converter. RS232 adalah standard komunikasi serial yang digunakan untuk koneksi periperal ke periperal. But this doesn't Arduino-based Modbus RTU to Modbus TCP/UDP gateway with web interface. The Modbus generally uses serial RS-232 or RS-485 as physical layer (then called Modbus Serial) and TCP/IP Learn how to send/receive data via RS485 using Arduino, how to program Arduino step by step. Arduino UNO – 2: 2. The main task was to write a firmware for the existing in stock PLC FX3U, the functionality of which should contain the Hello all! I need your help to read data from my MPP-Solar inverter. 19. My hardware setup is an Arduino Mega The main advantage of RS-485 over RS-232 is the multiple slave with single Master while RS-232 supports only single slave. Using modbus, i want to an Arduino c program that moves the AC Servo one revolution. Please find code attached. Can have a maximum of 32 devices connected to RS-485 protocol. Board : Arduino Nano RS485 Module : Conforms to Arduino IDE 1. Go to repository. Project Guidance. I want to read it using Arduino, Use Modbus equipment with your Arduino. FX3U is the master in this project, and OP320 acts as the slave using modbus protocol + rs232 interface. In this tutorial, we will discuss how to interface Arduino (as master) to any Modbus RTU (RS485) based sensor (as a slave) using Arduino IDE. I have a pic microcontroller that I can connect to with a USB to rs232 cable and I can communicate with Modbus protocol now i want to connect to the pic microcontroller with arduino mega2560 I connected the arduino to rs232 to ttl (max3232) and the max 3232 is connected to the pic I use this library Modbus RTU Master and this is my code # The Modbus is a master-slave protocol used in industrial automation and can be used in other areas, such as home automation. For HMI, 9600 and 19200 buad rate supported and acceptable. Mask Write Register. # include 1 real ModBus device with 9600/8/N/1; 1 proprietary RS485 device with is kinda ModBus but uses its own CeckSum algorithm: 56000/8/N/1; 1 RS232 device: 1200/8/N/1; The Arduino should talk to all three, logging the data its collects to an SD card and also be a ModBusTCP server for external devices in the LAN. g. Wires. RS-485: The most common interface for Modbus RTU, allowing for longer distances and the connection of multiple devices on a single bus network. without using additional physical layers like RS-485 or RS-232. Arduino IDE Version 1. My goal is to close a relay when battery capacity is under 70% and open back when battery capacity is 100%. The detail instruction, code, wiring diagram, video tutorial, line-by-line code explanation are provided to help you quickly get started with Arduino. We will create an example project by interfacing an RS485 Modbus protocol Here's what I'm up to: got a battery controller that has an RS232 serial port and proprietary protocol (I got the communication specs) and on the other side I have a simple PLC that can talk Modbus (either TCP/Ethernet port or RTU/RS485) The PLC could not be set to talk to the battery controller directly (has very limited programibility) so I would like to build a Programming Arduino Uno as MODBUS Master. How about posting that manual? RS-232 without modbus address. Contribute to smarmengol/Modbus-Master-Slave-for-Arduino development by creating an account on The physical layer of Modbus RTU typically uses one of three types of electrical interfaces: RS-232: Suitable for short-distance communications and often used for connections between a device and a PC. The inverter has two communication ports on it, 1 - USB and 2 - -RS 232 (RJ - 45) style connector. Facebook X LinkedIn Pinterest Reddit Skype Messenger Messenger WhatsApp Line Share via Email Print. 3v Giga serial port, and the MAX485 module's serial connections. I can see the result. org. For Modbus RTU communication:. Hi guys, i connect my arduino YUN to a TTL to RS232 adapter and then use a USB to RS232 adapter to PC. This library is used for communicating with RS-485 Modbus Master or Slave via RTU protocol. With the MAX chip I get no data at all. Releases. Arduinos prior to the Mega have one serial port which must be connected to USB (FTDI) for uploading sketches and to the RS232/485 Arduino library for communicating with Modbus slaves over RS232/485 (via RTU protocol). ; Use A and B pins of the MAX485 to connect to Tổng quan. But, I am not able to read and write data. 3V -----> VCC GND -----> GND. I found a standard library for Modbus (#include <ArduinoModbus. Switch – 2: 4. Vì nó được dự định tích hợp công nghiệp, Arduino sẽ giao tiếp với một modbus giả lập thông qua RS232, trong trường hợp này chúng tôi sử dụng Arduino Mega 2560 có nhiều cổng Serial, chúng tôi đã thực hiện một số sửa đổi cho thư viện slave modbus. 2. kozaki October 8, 2021, modbus to ESP32/ Modbus library in arduino. LED – 2: Modbus with Arduino UNO. The relay is connected with a power generator. i would suggest a logic level shifter between the 3. Read the documentation. The library The communication protocol of the choice was MODBUS through RS232 interface (as I already have MJ20-PRG; MJ20-CB200 and a MJ10-22-CS10). More stable, faster response version of "fx3u-m-op320-s-rs232" with solved issues - Yelgurk/fx3u-s-op320-m-rs232 In this post, we will discuss Arduino Modbus, specifically how to connect a Modbus slave device with Arduino. How to interface Modbus RTU (RS485) sensors with Arduino; What is the MAX232? MAX232 is an integrated circuit (IC) used for voltage level conversion in RS232 serial data communication. The Modbus is a master-slave protocol used in industrial automation and can be used in other areas, such as home automation. Arduinos prior to the Mega have one serial port which must be connected to USB (FTDI) for uploading sketches and to the RS232/485 not knowing the exact connections, i would second the "voltage issue". My name is Shahzada Fahad and I am an Electrical Enlighten your Arduino to be a Modbus master. Hello everybody, I have looked up multiple modbus-libraries on Github and read the example-codes. = 1. We will use as a base previous A library that allows your Arduino to communicate via Modbus protocol, acting as a slave (master in development). 2). Hardware Components. Welcome to this space learning automation technology applied to industry and everyday life. I'm working on a Modbus slave project using the giga. Navigation Menu Toggle navigation I also attached Renogy's RS232/modbus manual, it's somewhat This is an Arduino library for communicating with Modbus slaves over RS232/485 (via RTU protocol). For using Modbus in Arduino UNO, a library <ModbusRtu. Biasa juga disebut dengan jalur I/O ( input / output ). RS-422: arduino modbus RS232 experiment pada tanggal 26 februari 2018 kali ini membahas tentang modbus RTU pada arduino menggunakan port RS232. zvazkvjisibqoadjycdzwkdezoelfpsxbhaochnrjormztvuaqnwq
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