Application Note
FSA-028 (April 2011)
FSA-028 (April 2011)
page 3 of 22
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
CAUTION.
Do NOT attempt to upgrade your Firmware if your TRDI CiTaDeL CTD
is set to RS485 as this will lock your CPU board which will have to be replaced at
the factory.
c. The TRDI CiTaDeL CTD baudrate must be set to 9600bds.
d. The TRDI CiTaDeL CTD is self-powered in that WH/CTD integrated configura-
tion which means you will have to connect and install a fresh new battery in
your TRDI CiTaDeL CTD.
1.1.3
Timing Description
For Time between ensembles (TE) greater than 30 seconds
.
a. The TRDI CiTaDeL CTD is interrogated using the “polled” mode.
b. The WorkHorse “wakes up” 10 seconds before the start of an ensemble and
sends a command to the TRDI CiTaDeL CTD to wake up the TRDI CiTaDeL
CTD.
c. A command to collect data (@@GDATA) is sent to the TRDI CiTaDeL CTD 5
seconds before the start of the ensemble.
d. At the start of the ensemble the WorkHorse sends the retrieve data command
(@@DATA01) and reads the response from the TRDI CiTaDeL CTD. The data
is stored in a field in the ensemble data and the TRDI CiTaDeL CTD is powered
down (@@PWROFF).
e. The TRDI CiTaDeL CTD data is time-stamped 5 seconds before the start of the
ensemble.
NOTE.
When calculating Time between Pings (TP) you must allow 10 seconds
prior to the start of the ensemble for the TRDI CiTaDeL CTD interrogation.
TP(WP+BP) + 10 seconds should be less than TE.
Where
TP = Time between pings, WP = Number of Water Pings, BP = Number of Bottom
Pings
For Time between ensembles (TE) less than 30 seconds
.
Due to sampling and timing issues that directly affect battery life for both instru-
ments slightly different commands are used for ensembles of short duration (TE is
less than 30 seconds).
a. The TRDI CiTaDeL CTD is interrogated using the “polled” mode.
b. At the start of the ensemble the WorkHorse sends the retrieve data command
(@@DATA01) and reads the response from the TRDI CiTaDeL CTD. The data
is stored in a field in the ensemble data.
c. Immediately after the data has been received a command to collect data
(@@GDATA) is sent to the TRDI CiTaDeL CTD.
d. The result is that the TRDI CiTaDeL CTD data is collected and time-stamped
for the previous ensemble.
