Closed sl446 closed 4 months ago
Fixed. The reason is PB12 in V1 can not active power for rs485 block. Change to use power of I2C port (PB5). This issue in hardware was fix on version 2, currently we have version 3.
Thank you very much. The problem has been resolved.
Hello sir,
I am experiencing an issue with the Canopus version 1 board. The Modbus Master example code available on GitHub is not working, and my own code that uses the frames is also not working.
this is your exemple code :
And this is my code, using frames (when i run this code i see tx led blinking but with a dim light):
notice 1 : i use a Seeed studio EC sensor (RS485, 12V) i use a externel alimentation with this sensor and the seem gnd for all the system. notice 2 : i have also an conveter usb to RS485 for test.