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modbus_rtu_set_custom_rts()			   modbus_rtu_set_custom_rts()

Name
       modbus_rtu_set_custom_rts  -  set  a function to	be used	for custom RTS
       implementation

Synopsis
       int modbus_rtu_set_custom_rts(modbus_t *ctx, void (*set_rts) (modbus_t *ctx, int	on))

Description
       The modbus_rtu_set_custom_rts() function	shall set a custom function to
       be called when the RTS pin is to	be set before and  after  a  transmis-
       sion.  By  default this is set to an internal function that toggles the
       RTS pin using an	ioctl call.

       Note that this function adheres	to  the	 RTS  mode,  the  values  MOD-
       BUS_RTU_RTS_UP  or MODBUS_RTU_RTS_DOWN must be used for the function to
       be called.

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

Return value
       The modbus_rtu_set_custom_rts() function	shall return 0 if  successful.
       Otherwise it shall return -1 and	set errno to one of the	values defined
       below.

Errors
       • EINVAL, the libmodbus backend is not RTU.

						   modbus_rtu_set_custom_rts()

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