CiDRA Use of Foundation Fieldbus Protocol with SONARtrac Transmitters - Manual (Page 18)

Table 3 Transducer Block Configurations (Page 5)
UPDATE_RATE
Unsigned
Long
R/W
Sets transmitter update rate. Defines time units in
number of blocks. This parameter will set the update
rate in seconds (nominally). Actual update rate (in
seconds) can be calculated by taking (BLOCK_SIZE /
SAMPLE_FREQ) * UPDATE_RATE (VF mode) or
(BLOCK_SIZE / SOS_SAMPLE_FREQ) *
UPDATE_RATE (SOS mode).
SENSORS_IN_USE
Unsigned
Long
R/W
Sets number of sensors. Always leave set to 8. Do not
use this parameter to disable a sensor* use
NUM_SENSORS_USED parameter to set which
sensors to use in calculations.
TRANSMITTER_GAIN Float R/W
Set gain stage before A/D converter in transmitter. This
is NOT sensor head gain (preamp gain). It is normally
not a parameter which is modified. Use with caution.
Choose one of the following values: 1.0* 5.0* 20.0*
24.0* 48.0* 52.0* 67.0* 71.0* 202.0* 207.0* 221.0*
225.0* 250.0* 254.0* 269.0* 272.0
SPL_THRESHOLD Float R/W
This value is the threshold that the Average SPL must
break in order for any SOS or VF calculations to be
performed. A quality of -2 is reported if this threshold is
not met. Set this value to 0 to disable SPL.
WRITE_PROTECT
Unsigned
Char
R/W
Enable or disable modifications to the transmitter
FLASH memory. When modifying this* change only this
for proper operation.
IDLE_TIMEOUT Short R/W
If the transmitter is in idle mode* and no
communications are detected on a serial or Ethernet
port for this time period* transmitter will automatically go
to run mode. A setting of 0 disables this.
ETHERNET_IDLE_TIMEOUT Short R/W
If no communications are detected on the Ethernet port
for this time period* transmitter will automatically close
the connection. A setting of 0 disables this timeout.
SYSTEM_DYNAMIC
SPL_AVERAGE Float R The average SPL measurement from all active sensors.
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