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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>Arduino UNO</td> <td style="text-align:center;">D2</td> <td style="text-align:center;">D9</td></tr> <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="arduino-hardware-setup"><a href="#arduino-hardware-setup" class="header-anchor">#</a> Arduino Hardware setup</h2> <p><img src="/dev/assets/img/OpenMQTTgateway_Arduino_Addon_RS232.042dfac7.png" alt="RS232"></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_RS232.701c7ce6.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_RS232.78e494f3.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/rs232.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">12/12/2023, 8:03:11 PM</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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