modbus_rtu_get_rts - get the current RTS mode in RTU

       The libmodbus documentation was written by Stéphane Raimbault <stephane.raimbault@gmail.com>

libmodbus v3.1.6                                   12/09/2019                              MODBUS_RTU_GET_RTS(3)

       The modbus_rtu_get_rts() function shall get the current Request To Send mode of the libmodbus context
       ctx. The possible returned values are:

       •   MODBUS_RTU_RTS_NONE

       •   MODBUS_RTU_RTS_UP

       •   MODBUS_RTU_RTS_DOWN

       This function can only be used with a context using a RTU backend.

EINVAL
           The libmodbus backend is not RTU.

       modbus_rtu_get_rts - get the current RTS mode in RTU

       The function shall return the current RTS mode if successful. Otherwise it shall return -1 and set errno.

modbus_rtu_set_rts(3)

intmodbus_rtu_get_rts(modbus_t*ctx);