Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help 
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 imple-
     mentation

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  transmission.  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 be-
     low.

Errors
     * EINVAL, the libmodbus backend is not RTU.

						     modbus_rtu_set_custom_rts()

Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=modbus_rtu_set_custom_rts&sektion=3&manpath=FreeBSD+Ports+15.1.quarterly>

home | help