Setting up and using the ISUS with Seabird CTD
1). Connect the ISUS to a 6-pin CTD port – we use voltage channel 6. Map that port in Seasave as user-polynomial; under the user-polynomial, enter
A0 = - 9.7403, A1 = 31.299.
These are linear regression coefficients from an earlier CalCOFI.
2). Connect the battery cable to the ISUS fifteen minutes prior to deployment to improve data quality & stability.
3). Wetlabs 12v lead-acid batteries usually last 6 hours between charges. They require 12-15hrs to recharge so rotate the three primary batteries or use an 'on-rosette' charging system. Be sure to unstopper the center plug when charging the batteries to allow hydrogen emissions. Re-stopper, greasing lightly, before mounting the fresh battery on rosette. When charging on the rosette, protect from moisture intrusion by keeping the vent-plug closed. Be sure to vent the battery before deployment.
4). Remove the ISUS on casts deeper than 1000m. The 512kb memory allows storage so all 75 casts without the need to download data and purge the memory. Data are downloaded by connecting the ISUS to a Windows laptop’s serial port.
- Use terminal.exe to handshake with the ISUS, settings are 38400,n,8,1. You will see the ISUS boot messages and after several seconds it will start counting down for data acquisition.
- Press S to stop the countdown then M (or H) to get the system menu, follow the prompts.
- Use the file commands to delete all the data or download all data.
- To download data
- initiate the download in terminal.exe by sending the command to the ISUS, selecting 115200 baud
- disconnect terminal.exe then switch to HyperTerminal (Windows default com program – I usually have it already setup in the background at 115200,n,8,1)
- connect to the ISUS then Transfer/Receive File, select ymodem-g.
It will download three files then requires you to Transfer/Receive File YModem-G again, repeat 10x to download 30 files.
- Delete all data to free up the memory.
- To download data
5). Collect more data, repeat step 4 as necessary.
| < Prev | Next > |
|---|
