Otherwise it shall return -1 and set errno. SEE ALSO modbus_set_socket(3) modbus_reply(3) AUTHORS The libmodbus documentation was written by Stéphane Raimbault <stephane.raimbault@gmail.com>libmodbus 3.1.4 Last updated 2016-05-11 17:53:09 CEST ...
Like Reply K Thread Starter kannannatesh Jul 13, 2021 #7 jschulze said: Receiving 30 B1 is an indication you configured your serial port for 8 data bits and no parity when your Modbus ASCII device uses 7 data bits and even parity. Try changing your serial port settings to 7 data...