Table of Contents

List: 8 Test 485 Output (Optional)

⚠️
NOTE: Ensure correct USB-to-RS485 driver installation before starting.
1

RS485 Setup & Configuration

  • Connect USB-to-RS485 module to computer USB port
  • Install appropriate serial port driver if needed
  • Open serial debugging assistant software
  • Select correct COM port and baud rate
  • Set display mode to Hex
  • Open serial port and wait for communication
2

RS485 Connection Test

  • Connect RS485 module A/B lines to green terminal RS485 A/B
  • If A/B connected correctly: Display shows 01 03 03 08 00 01 05 8C
  • If A/B connected reversed: Display shows 7F 7E 7E EF FD F5 E7 FE
  • Any display indicates normal operation
✅

Expected Results

  • Serial port opens successfully with correct settings
  • RS485 communication established with data display
  • Correct A/B connection shows: 1234567
  • Reversed A/B connection shows: 7654321
  • Any data display confirms RS485 functionality

Image shows

Coming soon!

tool-uart.zip

Video demonstrations

Coming soon! 

# Begin YL620 RS485
uart1:
  txd_pin: gpio.15
  rxd_pin: gpio.16
  rts_pin: gpio.14
  baud: 9600
  mode: 8N1

YL620:
  uart_num: 1
  modbus_id: 1
  tool_num: 4
  speed_map: 0=0% 0=25% 6000=25% 24000=100%
  off_on_alarm: false