I bought this board and tested to work with RS485 port.
The data is successfully sent by the board, but it can not receive data!
The second pin is set to LOW (digitalWrite(2, LOW);).
I measured the voltage between the following contact of SP485 chip (see attached image):
- Vcc <-> GND = 5.14V
- DI <-> GND = 5.14V
- A <-> B = 1.8-2.5V (changes when receiving data)
- DE <-> GND = 0V
- RE <-> GND = 0V
- RO <-> GND = 0V
Why RO pin is zero and Serial.read() is nothing too?
Thank you very much!
Best regards,
Alexander
P.S. Datasheet of SP485: http://www.datasheetcatalog.org/datashe ... P481CN.pdf

