Sea-Bird Electronics SBE 38 Manual do Utilizador descarregar pdf (Página 14)

Section 4: Deploying and Operating RS-232 SBE 38

Continuous Sampling

The SBE 38 continuously samples and transmits real-time data.

Sampling is started by:

• Sending Go, or

• Setting AutoRun=Y. If AutoRun=Y, sampling automatically starts when

power is applied.

Sampling is stopped by:

• Sending Stop, or

• Removing power.

Baud Rate, Cable Length, and Power

Baud Rate and Cable Length

For RS-232, the length of cable that the SBE 38 can drive to transmit real-time

data is dependent on the baud rate. The allowable combinations are:

Maximum Cable Length (meters) Maximum Baud Rate

800 1200

400 2400

200 4800

100 9600

Example: Continuous Sampling (user input in bold)

Example 1 AutoRun=N: Apply power and establish communications. Set up to average 4 measurements per sample and output

converted data with 3 digits after decimal place. Set up to wait for a command when power is applied. Remove power.

(Apply power and then click Connect on Toolbar.)

S>NAVG=4

S>FORMAT=C

S>DIGITS=3

S>AUTORUN=N

S>DS (to verify setup)

(Remove power.)

When ready to start sampling, apply power and establish communications. Send command to start sampling continuously,

outputting real-time data. When desired, send command to stop sampling.

(Apply power and then click Connect on Toolbar.)

S>GO

S>STOP (You may need to send Stop several times to interrupt sampling.)

Example 2 AutoRun=Y: Apply power and establish communication. Set up to average 4 measurements per sample and output

converted data with 3 digits after decimal place. Set up to automatically begin sampling when power is applied. Remove power.

(Apply power and then click Connect on Toolbar.)

S>NAVG=4

S>FORMAT=C

S>DIGITS=3

S>AUTORUN=Y

S>DS (to verify setup)

(Remove power.)

To start sampling, apply power. SBE 38 begins sampling continuously, outputting real-time data.

To stop sampling, remove power.

To change setup: apply power, and then stop sampling by command.

(Apply power)

(Press Enter key to get S> prompt)

S>STOP (You may need to send Stop several times to interrupt sampling.)

(Enter commands as desired to change setup.)

Notes:

• Baud rate is set with Baud=

(see Command Descriptions in

this section).

• For RS-485, see Appendix III:

RS-485 Interface for

baud rate limitations.

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