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ser_flush_in(upsfd, "", nut_debug_level);

  ser_send(upsfd, "RI\r");  /* identify */

  x = etapro_get_response("SR");  /* manufacturer */

  if (x < 0) {

    dstate_datastale();

    return;

  }

  x = etapro_get_response("SS");  /* model */

  if (x < 0) {

    dstate_datastale();

    return;

  }

  x = etapro_get_response("ST");  /* mfr date */

  if (x < 0) {

    dstate_datastale();

    return;

  }

  x = etapro_get_response("SU");  /* UPS ident */

  if (x < 0) {

    dstate_datastale();

    return;

  }

  ser_send(upsfd, "RP\r");  /* read measurements */

  x = etapro_get_response("SO");  /* status flags */

  if (x < 0) {

    dstate_datastale();

    return;

  }

  flags = x;

  x = etapro_get_response("SG");  /* input voltage, 0xFF = 270V */

  if (x < 0) {

    dstate_datastale();

    return;

  }

  utility = (270.0 / 255) * x;

  x = etapro_get_response("SH");  /* output voltage, 0xFF = 270V */

  if (x < 0) {

    dstate_datastale();

    return;

  }

  outvolt = (270.0 / 255) * x;

  x = etapro_get_response("SI");  /* battery voltage, 0xFF = 14V */

  if (x < 0) {

    dstate_datastale();

    return;

  }

  /* TODO: >= 1000VA models have a 24V battery (max 28V) - check

     the model string returned by the RI command.  */

  battvolt = (14.0 / 255) * x;

  x = etapro_get_response("SL");  /* load (on battery), 0xFF = 150% */

  if (x < 0) {

    dstate_datastale();

    return;

  }

  loadpct = (150.0 / 255) * x;

  x = etapro_get_response("SN");  /* time running on battery */

  if (x < 0) {

    dstate_datastale();

    return;

  }

  /* This is the time how long the UPS has been running on battery

     (in seconds, reset to zero after power returns), but there

     seems to be no variable defined for this yet...  */

  status_init();

  if (!(flags & 0x02))

    status_set("OFF");

  else if (flags & 0x01)

    status_set("OL");

  else

    status_set("OB");

  if (!(flags & 0x04))

    status_set("LB");

  /* TODO bit 3: 1 = ok, 0 = fault */

  if (flags & 0x10)

    status_set("BOOST");

  if (loadpct > 100.0)

    status_set("OVER");

  /* Battery voltage out of range (lower than LB, or too high).  */

  if (flags & 0x20)

    status_set("RB");