RS485 Control

Connect the ESP32-S3-ETH-8DI-8RO device using RS485, and send data to ESP32-S3-ETH-8DI-8RO to control the opening and closing of each relay. Communication is performed at a default baud rate of 9600.

Operation Command	Command Function
06 05 00 01 55 00 A2 ED	Switch the state of CH1 relay
06 05 00 02 55 00 52 ED	Switch the state of CH2 relay
06 05 00 03 55 00 03 2D	Switch the state of CH3 relay
06 05 00 04 55 00 B2 EC	Switch the state of CH4 relay
06 05 00 05 55 00 E3 2C	Switch the state of CH5 relay
06 05 00 06 55 00 13 2C	Switch the state of CH6 relay
06 05 00 07 55 00 42 EC	Switch the state of CH7 relay
06 05 00 08 55 00 72 EF	Switch the state of CH8 relay
06 05 00 FF FF 00 BD BD	Turn on all relays
06 05 00 FF 00 00 FC 4D	Turn off all relays

Hardware Connection

Here we use the example of USB TO RS232/485 Converter for demonstration

ESP32-S3-Relay-6CH	USB-TO-RS232-485
RS485 - A+	Tx B - A+
RS485 - B-	Rx B - B-

Software Operation

Use SSCOM to send data
Open the SSCOM software and select the COM port corresponding to the Port B connected above
Open the serial port and use the Send Multi Char function to quickly send commands

You can control the relays with the following commands

TAG： ESP32-S3-Zero Raspberry Pi PICO MP2.5G Raspberry Pi 5 PCIe to 2.5G Ethernet HAT Pi5 RTL8125 DeepSeek XiaoZhi AI Voice Chat Robot BOX ESP32-S3 Development Board 3.5 inch LCD N16R8 Touchscreen Display 6-Axis /Camera /SD Raspberry Pi 5 Argon-NEO-M.2-NVME-PCIE-Expansion-Board Only For Argon NEO 5 Case (Not include) Raspberry Pi 5 8mp Camera RS485 to RJ45 Luckfox Pico RJ45 User Guide Raspberry Pi 14 inch LCD 2K HDMI /Type C Display Capacitive TouchScreen 2160x1440 For Jetson Nano/mini Computer PC Rounded LCD Argon Raspberry Pi 0.96inch LCD NanoKVM-USB Quick Start IMX462 Raspberry Pi Pico ESP32-P4 ESP32-C6 Development Board RISC-V WiFi6 MIPI CSI Camera 7/10.1 inch DSI Display /RJ45 Ethernet /Mic /Audio Size Compatible with Raspberry Pi X1203 Raspberry Pi 5 UPS Board Uninterruptible Power Supply For Li-Battery (NOT includ) Windows Environment User Guide Raspberry Pi 5 SSD

RS485 Control Tutorial

RS485 Control

Hardware Connection

Software Operation

Raspberry Pi Pico Pico Dual / Quad Expander Two Sets of Male Headers