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3cky avatar 3cky commented on July 1, 2024

Hi @jeffersonpimenta,

First of all, make sure you have disabled serial console on /dev/ttyS0 (see an example here).

Also, you have trx_control = rts in your config. Since RPi ttyS0 serial port doesn't have the RTS line, you probably would to replace rts with addc . If your RS232/485 adapter doesn't support ADDC mode (automatic data direction control), you could try to control it with GPIO pin using sysfs method.

from mbusd.

jeffersonpimenta avatar jeffersonpimenta commented on July 1, 2024

Now it works fine: i notice tx blink one extra time before request from modbus, it should be activity on terminal spit out in serial.

Note: rts and addc makes no diference for me, works on both mode. In thesis this board has automatic tx and rx flow control.

Anyway, thanks!

from mbusd.

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