Sea-Bird Electronics SBE 38 Manual de usuario descargar pdf (Pagina 53)

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

RS-232 Sensor Setup Commands (continued)

Setup for GTD:

SBE 19plus V2 must be in Moored mode (MM) to obtain GTD data. Set up

GTD to interface with 19plus V2, before you connect it to 19plus V2. Connect

GTD directly to computer, power with an external power supply, and (using

software provided by Pro-Oceanus) set:

• Baud rate to same baud rate as 19plus V2.

• Output to millibars.

• Sum of pressure integration time and temperature integration time so

that GTD responds to a take pressure reading command in 40 seconds or

less (required so that 19plus V2 does not time out while waiting for reply).

Connect GTD to 19plus V2 Auxiliary RS-232 Input connector, using provided

cable (end labeled Pro-Oceanus to GTD; end labeled Sea-Bird to 19plus V2).

In the 19plus V2, set:

• GTD=Y or DualGTD=Y to enable interface.

• SendGTD= to change IDs if necessary.

The 19plus V2 samples the GTD last, after DelayBeforeSampling=, and after

conductivity, temperature, and pressure, and all voltage channels have been

sampled. To conserve power, the voltage to any other external sensors and the

pump are turned off before acquiring the GTD sample.

Each time a sample is to be taken, 19plus V2 sends following commands to

GTD (ID= 01, 02, etc.):

• *ID00VR <CR><LF> - get GTD firmware version; wait up to 3 seconds for reply.

• *ID00SN <CR><LF> - get GTD serial number; wait up to 5 seconds for reply.

• *9900P5 <CR><LF> - command all GTDs to sample pressure; hold data in GTD.

• *ID00DB <CR.<LF> - get held pressure; wait up to 90 seconds for reply.

• *9900Q5 <CR><LF> - command all GTDs to sample temperature; hold data in GTD.

• *ID00DB <CR.<LF> - get held temperature; wait up to 90 seconds for reply.

GTD=x x=Y: Enable RS-232 GTD.

x=N: Do not enable GTD.

DualGTD=x x=Y: Enable dual (2) GTDs.

x=N: Do not enable dual GTDs.

TGTD Measure GTD(s), output 1 sample of data

from each GTD (firmware version, serial

number, pressure, and temperature).

SendGTD=command Command 19plus V2 to send command to

GTD and receive response; command can

be any command recognized by GTD

(see GTD manual).

Example: Output GTD data for system with dual GTDs (user input in bold):

TGTD

GTD#1 VR reply = *0001VR=s2.03 (GTD firmware version)

GTD#2 VR reply = *0002VR=s2.03 (GTD firmware version)

GTD#1 SN reply = *0001SN = 75524 (GTD serial number)

GTD#2 SN reply = *0002SN = 81440 (GTD serial number)

GTD#1 pressure reply = *00011010.04661, p = 101004661 (millibars x 10

)

GTD#2 pressure reply = *00021010.01580, p = 101001580 (millibars x 10

)

GTD#1 temperature reply = *000123.49548, t = 23.4955 (°C)

GTD#2 temperature reply = *000223.0357038, t = 23.0357

(°C)

Examples: (user input in bold)

Send firmware version command to GTD #1: Send serial number command to GTD #2:

SENDGTD=*0100vr SENDGTD=*0200sn

Sending GTD: **0100vr Sending GTD: **0200sn

GTD RX = *0001VR=s2.03 GTD RX = *0002SN=81440

Note:

In Moored mode, the 19plus V2

sample interval (SampleInterval=)

must be greater than or equal to the

sum of the times required to sample.

Total time is affected by the following:

- Programmable pressure

integration time for GTD.

- Programmable temperature

integration time for GTD.

- Minimum time required for 19plus V2

to take a sample (≈ 2.5 sec).

- Time required for 19plus V2 to take

and average NCycles= samples;

samples are taken 0.25 sec apart.

- Delay after providing power to

external sensors before sampling

(DelayBeforeSampling=).

- Time required to run pump before

sampling (0.5 sec if

MooredPumpMode=1).

Notes:

• A 19plus V2 with dual GTDs is

shipped with a Y-cable installed for

the GTDs. The GTD ends are

labeled GTD #1 and #2, and Sea-

Bird set the GTD IDs to match.

• If DualGTD=Y, setting for GTD= has

no effect.

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Sea-Bird Electronics SBE 38 Manual de usuario Pagina 53

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