Campbell-scientific OBS500 Smart Turbidity Meter with ClearSensor Tech Manuel d'utilisateur télécharger pdf (Page 29)

OBS500 Smart Turbidity Meter with ClearSensor™ Technology

7.4 Communication Modes

7.4.1 SDI-12

The OBS500 uses an SDI-12-compatible hardware interface and supports a

subset of the SDI-12 commands. The most commonly used command is the

aM! command, issued by the datalogger. Here, a represents the sensor address

(0 to 9). The communication sequence begins with the datalogger waking the

sensor and issuing the aM! command. The sensor responds to the datalogger

indicating that two measurements will be ready within two (2) seconds.

Subsequent communications handle data reporting from the sensor to the

datalogger.

The SDI-12 protocol has the ability to support various measurement

commands. The OBS500 supports the commands that are listed in the TABLE

7-7.

TABLE 7-7. SDI-12 and RS-232 Measurement Commands

Commands

Process

Values Returned

aM!

aC!

a = address

Open Wiper

Measure

Send Data

obs (tu)

ss (tu )

temperature (degc)

wet dry (0=dry 1=wet)

aM1!

aC1!

Open Wiper

Measure

Send Data

ratio (tu)

temperature (degc)

wet dry (0=dry 1=wet)

aM2!

aC2!

Open Wiper

Measure

Send Data

obs (tu)

ss (tu )

ratio (tu)

temperature (degc)

raw obs (volts)

raw ss (volts)

open current (ma)

close current (ma)

wet dry (0=dry 1=wet)

aM3!

aC3!

Open Wiper

Send Data

open wiper position count

open max current count

open timeout count

open current (ma)

aM4!

aC4!

Measure

Send Data

obs (tu)

ss (tu )

temperature (degc)

wet dry (0=dry 1=wet)

aM5!

aC5!

Measure

Send Data

ratio (tu)

temperature (degc)

wet dry (0=dry 1=wet)

aM6!

aC6!

Measure

Send Data

obs (tu)

ss (tu )

ratio (tu)

temperature (degc)

raw obs (volts)

raw ss (volts)

open current (ma)

close current (ma)

wet dry (0=dry 1=wet)

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 63 64

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Campbell-scientific OBS500 Smart Turbidity Meter with ClearSensor Tech Manuel d'utilisateur Page 29

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