Sea-Bird Electronics SBE 38 Bedienungsanleitung PDF herunterladen (Seite 19)

Manual revision 006 Section 2: Description of SBE 19plus V2 SBE 19plus V2

Data Storage

The SBE 19plus V2 has a 64 Mbyte FLASH memory. Shown below

are calculations of available data storage for several configurations.

See Specifications for storage space required for each parameter.

Data I/O

The SBE 19plus V2 receives setup instructions and outputs diagnostic

information or previously recorded data via a three-wire RS-232C link, and is

factory-configured for 9600 baud, 8 data bits, 1 stop bit, and no parity.

19plus V2 RS-232 levels are directly compatible with standard serial interface

cards (IBM Asynchronous Communications Adapter or equal). The

communications baud rate can be changed using BaudRate= (see Command

Descriptions in Section 4: Deploying and Operating SBE 19plus V2).

Magnetic Reed Switch

Profiling Mode

A magnetic switch, mounted on the conductivity cell guard, can be used to

start and stop logging in Profiling mode. Sliding the switch to the On position

wakes up the SBE 19plus V2 and starts logging. Sliding the switch to the Off

position stops logging. The switch should be Off (towards the sensor end cap)

when not logging data; i.e., during setup, diagnostics, and data extraction.

The 19plus V2 can be set up to ignore the switch position:

• If IgnoreSwitch=Y: logging is started and stopped with

commands sent through the terminal program. Switch position has no

effect on logging.

• If AutoRun=Y: logging is started and stopped when external power is

applied and removed. Switch position has no effect on logging.

Moored Mode

In Moored mode, the magnetic switch position has no effect on logging.

Logging is started and stopped with commands sent through the

terminal program.

Example 1: Profiling mode, no auxiliary sensors, strain-gauge pressure

T & C = 6 bytes/sample Strain-gauge P = 5 bytes/sample

Storage space ≈ 64,000,000 / (6 + 5) ≈ 5,818,000 samples

Example 2: Profiling mode, 6 external voltages, strain-gauge pressure

T & C = 6 bytes/sample Strain-gauge P = 5 bytes/sample

External voltages = 2 bytes/sample * 6 voltages = 12 bytes/sample

Storage space ≈ 64,000,000 / (6 + 5 + 12) ≈ 2,782,000 samples

Example 3: Moored mode (stores date and time), 6 external voltages, strain-gauge pressure, SBE 38 RS-232 sensor

T & C = 6 bytes/sample Strain-gauge P = 5 bytes/sample SBE 38 = 3 bytes/sample

External voltages = 2 bytes/sample * 6 voltages = 12 bytes/sample Date/Time = 4 bytes/sample

Storage space ≈ 64,000,000 / (6 + 5 + 12 + 3 + 4) ≈ 2,133,000 samples

Notes:

• See Command Descriptions in

Section 4: Deploying and

Operating SBE 19plus V2.

• Leave the switch in the Off

position if IgnoreSwitch=Y or

AutoRun=Y, or in Moored mode. If

the switch is On, the 19plus V2

draws an additional 15 µA from the

battery while in quiescent state.

Magnetic switch

Sensor

end cap

Note:

See Battery Endurance for

power limitations.

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