USB HID to UART, RS-485 Extension Board
https://www.electrodragon.com/product/usb-hid-to-uart-rs-485-extension-board/
- 5V/GND external power supply
- blue box: chip output to USB
- red box: chip output to RS485
Pin Definitions:
- Left-top USB: USB-TTL data
- Left-bottom Pins: RS-485
- right-top USB: USB Down
- right-bottom USB: USB UP
check points
- RS485 no output?
- please check if the jumper is set to red box
- USB and RS485 output can not be selected in the same time.
SCH
-
SCH1 of chip
-
SCH2 peripheral
Configuration
Default baud rate is 115200
S1 / S0 - 1/0 default
- 11 = mode 1
- 10 = mode 2
- 01 = mode 3
- 00 = mode 4
baud1 / baud 0 - 115200 baudrate default
- 11 = 115200 baudrate default
- 01 = 57600
- 10 = 38400
- 00 = 300 000
SEL
- 1 = master mode, upper machine mode, USB to PC machine
- 0 = slave mode, accpet USB devices like keyboard, mouse
demo
https://www.youtube.com/shorts/UZahFdell4g