Campbell-scientific CS650 and CS655 Water Content Reflectometers Instrukcja Użytkownika Pobierz pdf (Strona 26)

CS650 and CS655 Water Content Reflectometers

TABLE 6-4. CS650 SDI-12 Commands

SDI-12 command

(“a” is the sensor

address)

Values Returned

Units

aM!

1) Volumetric Water Content, θ

2) Electrical Conductivity, σ

3) Temperature

dS/m

°C

aM1!

1) Permittivity, ε

2) Electrical Conductivity, σ

3) Temperature

dS/m

°C

aM2!

1) Period, τ

2) Voltage Ratio, α

3) Temperature

µSec

°C

aM3!

1) Volumetric Water Content, θ

2) Electrical Conductivity, σ

3) Temperature

4) Permittivity, ε

5) Period, τ

6) Voltage Ratio, α

dS/m

°C

µSec

aM4! .. aM9!

No Values Returned

Returns the SDI-12 Address

aI!

CampbellSci, OS version, Product

Serial Number

Up to 10 CS650’s may be connected to the same datalogger control port as

long as each one has a unique SDI-12 address. The CS650 ships with a default

SDI-12 address of 0 unless otherwise specified at the time of ordering. The

SDI-12 address may be changed through DevConfig software (see Section 6.4,

A200 and Device Configuration Utility) or with a terminal emulator in SDI-12

transparent mode (see Appendix B).

SDI-12 communication is established using the CRBasic instruction

SDI12Recorder for CRBasic dataloggers or the Edlog program instruction

P105 SDI-12 Recorder. See Appendix B for more detail on SDI-12

communication.

6.5.1 Use of Multiplexers

Multiplexers such as Campbell Scientific’s AM16/32B may be used to connect

up to 32 CS650 probes to a single control port. When using multiplexers, the

simplest configuration is for all probes to have the same SDI-12 address.

When multiplexing CS650 probes, the switched 12V channel should be used so

that power to the sensor may be turned off under program control before the

multiplexer switches to the next channel.

Failure to turn off the switched 12 volt channel before

clocking the multiplexer will result in damage to the

multiplexer relays.

CAUTION

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 55 56

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