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<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav> <ul class="sidebar-links"><li><a href="/dev/" aria-current="page" class="sidebar-link">0 - What is it for 🏠</a></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>1 - Prerequisites🧭</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>2 - Set it up 🔨</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/dev/setitup/rf.html" class="sidebar-link">RF gateway (433mhz/315mhz)</a></li><li><a href="/dev/setitup/ble.html" class="sidebar-link">BLE gateway</a></li><li><a href="/dev/setitup/ir.html" class="sidebar-link">IR gateway</a></li><li><a href="/dev/setitup/lora.html" class="sidebar-link">LoRa gateway</a></li><li><a href="/dev/setitup/gsm.html" class="sidebar-link">GSM 2G gateway</a></li><li><a href="/dev/setitup/serial.html" aria-current="page" class="active sidebar-link">Serial/RS232 gateway</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/dev/setitup/serial.html#compatible-parts" class="sidebar-link">Compatible parts</a></li><li class="sidebar-sub-header"><a href="/dev/setitup/serial.html#pinout" class="sidebar-link">Pinout</a></li><li class="sidebar-sub-header"><a href="/dev/setitup/serial.html#esp8266-hardware-setup" class="sidebar-link">ESP8266 Hardware setup</a></li><li class="sidebar-sub-header"><a href="/dev/setitup/serial.html#esp32-hardware-setup" class="sidebar-link">ESP32 Hardware setup</a></li><li class="sidebar-sub-header"><a href="/dev/setitup/serial.html#credits" class="sidebar-link">Credits</a></li></ul></li><li><a href="/dev/setitup/sensors.html" class="sidebar-link">Sensors</a></li><li><a href="/dev/setitup/actuators.html" class="sidebar-link">Actuators</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>3 - Upload ➡️</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>4 - Use ✈️</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>5 - Integrate 🎉</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>6 - Participate 💻</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="serial-rs232-gateway"><a href="#serial-rs232-gateway" class="header-anchor">#</a> Serial/RS232 gateway</h1> <h2 id="compatible-parts"><a href="#compatible-parts" class="header-anchor">#</a> Compatible parts</h2> <table><thead><tr><th>Module</th> <th>Purpose</th> <th>Where to Buy</th></tr></thead> <tbody><tr><td>TTL to RS232 module</td> <td>Transceiving</td> <td>-</td></tr></tbody></table> <p>Any module using a MAX232 chip will work. Don't pay extra to get all the signals, we're only using RX and TX.</p> <h2 id="pinout"><a href="#pinout" class="header-anchor">#</a> Pinout</h2> <table><thead><tr><th>Board</th> <th style="text-align:center;">Receiver Pin</th> <th style="text-align:center;">Emitter Pin</th></tr></thead> <tbody><tr><td>ESP8266</td> <td style="text-align:center;">D2</td> <td style="text-align:center;">D4</td></tr> <tr><td>ESP32</td> <td style="text-align:center;">27/<strong>26</strong></td> <td style="text-align:center;">14</td></tr></tbody></table> <p>Connect VCC on the module to 5V of your board, and the ground on the module to the ground of your board. your Transmit pin goes to TX and your Receive pin goes to RX. This may seem backwards, but the module is labeled as where it will be connected on the RS232 side of the module.</p> <h2 id="esp8266-hardware-setup"><a href="#esp8266-hardware-setup" class="header-anchor">#</a> ESP8266 Hardware setup</h2> <p><img src="/dev/assets/img/OpenMQTTgateway_ESP8266_Addon_RS232.7fcd50ec.png" alt="RS232"></p> <h2 id="esp32-hardware-setup"><a href="#esp32-hardware-setup" class="header-anchor">#</a> ESP32 Hardware setup</h2> <p><img src="/dev/assets/img/OpenMQTTgateway_ESP32_Addon_RS232.571e5e5b.png" alt="RS232"></p> <h2 id="credits"><a href="#credits" class="header-anchor">#</a> Credits</h2> <p>RS232 gateway Developed by DieKatzchen</p></div> <footer class="page-edit"><div class="edit-link"><a href="https://github.com/1technophile/OpenMQTTGateway/edit/development/docs/setitup/serial.md" target="_blank" rel="noopener noreferrer">Edit this page</a> <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></div> <div class="last-updated"><span class="prefix">Last Updated:</span> <span class="time">12/7/2025, 4:27:01 PM</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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