Sea-Bird Electronics SBE 38 Manual do Utilizador descarregar pdf (Página 37)

Manual revision 006 Section 4: Deploying and Operating SBE 19plus V2 SBE 19plus V2

With a Sea-Bird Deck Unit

Set the 19plus V2 baud rate to 4800 if using the 19plus V2 with either of the

following real-time data acquisition systems:

• SBE 36 CTD Deck Unit and Power and Data Interface Module (PDIM)

• SBE 33 Carousel Deck Unit and SBE 32 Carousel Water Sampler OR

SBE 33 Carousel Deck Unit and SBE 55 ECO Water Sampler

The data telemetry link can drive 10,000 meters of cable while accepting

4800 baud serial data. The relationship between transmission rate, amount of

data transmitted, and baud rate is as described above for a 19plus V2 without a

Deck Unit.

Real-Time Data Acquisition

Real-time data can be acquired in either of the following ways:

• With Seasave (typical method) – When the 19plus V2 is set up for

Profiling Mode or Autonomous Sampling Moored Mode, data can be

viewed in Seasave in tabular form or as plots, as raw data or as converted

(engineering units) data. Data acquired with Seasave can be processed

with SBE Data Processing. See Seasave’s Help files for details on setting

up the program displays, baud rates, etc., and beginning data acquisition.

• With Seaterm232 – Click the Capture menu; enter the desired file name in

the dialog box, and click Save. Begin logging. The data displayed in

Seaterm232 will be saved to the designated file. Process the data as

desired. Note that this file cannot be processed by SBE Data Processing

or displayed in Seasave, as it does not have the required headers and

format for Sea-Bird’s processing software.

Timeout Description

The SBE 19plus V2 has a timeout algorithm. If the 19plus V2 does not receive

a command or sample data for 2 minutes, it powers down its main digital

circuits. This places the 19plus V2 in quiescent state, drawing minimal current.

To re-establish control (wake up), click Connect in Seaterm232’s

Communications menu or press the Enter key.

Example - 19plus V2 with an SBE 33 or 36 Deck Unit. Profiling Mode, strain-gauge pressure, configured with 2 external

voltages. What is the fastest rate you can transmit data with OutputFormat=0 (raw hexadecimal data)?

With a Deck Unit, the 19plus V2 requires a baud rate of 4800.

Number of characters (from Data Output Formats) =

6 (T) + 6 (C) + 6 (P) + 4 (P temperature compensation) + 2*4 (external voltages) + 2 (carriage return & line feed) = 32

Time required to transmit data = (32 characters * 10 bits/character) / 4800 =

0.067 seconds < 0.25 seconds (4 Hz, maximum sampling rate).

Therefore, set NAvg=1, providing 4 Hz data (one sample every 0.25 seconds) for this configuration.

Note:

If the FLASH memory is filled to

capacity, data sampling and

transmission of real-time data (if

programmed) continue, but excess

data is not saved in memory.

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