CTD SAMPLER

The program ctdsampler is a utility that allows reading out Seabird's Glider Payload CTDs.

Wiring

The CTD is to be connected to a serial port on this computer

PC -> switch board : 3 wired serial cable (RX/TX/GND) switch board -> CTD : 4 wired serial cable (RX/TX/VCC/GND) power source -> switch board : 2 wired power cable (VCC/GND)

The voltage supply to the CTD should be betwen 8 and 20 V. Do not overload!

Operation

When the program is started, it shows two data fields: Monitor and Results. The Monitor field shows the output from the CTD as read by the program. When the CTD is logging, then triplet or quadruplets of data are shown, depending on the setting of the output format (raw (4) or converted (3)). In case of converted data (3 values), the colums indicate conductivity, temperature and pressure, respectively.

The Results field shows the running averaged values of the data read.

When the program is started, also a graphic window pops-up, showing the data recorded graphically. Measurements (values presented in Monitor) are indicated by a dot, whereas the running averages (values presented in Results) are shown as lines. Depending on the output format (raw/converted), four or three panels are populated with data.

Commands

Note: The key commands to the program work only if the terminal window is active!

Stop and Start logging : press S and R, respectively Change output format : CTD should not be logging (press S first). Type O to toggle the format. Reset running averaged : press C (when logging). The averagers of for the values in the Result field are reset. Also applies to the graphical representation Clear graph : press G to erase all data from the graphs Adjust y-scales : press A to adjust the y-scales of all graphs to the data extent. End program : press Q

Bugs

Closing the graphical window causes the program to exit uncleanly.