Campbell-scientific AL200 ALERT2 Encoder, Modulator, and Sensor Interf Bedienungsanleitung PDF herunterladen (Seite 18)

AL200 ALERT2 Encoder, Modulator, and Sensor Interface

• Set the SDI-12 Offset – (0) – This is a sensor specific value that along

with the SE1 Multiplier will be used to convert the analog output of a

sensor to an engineering unit. See Appendix H, Calculating

Multipliers and Offsets, for how to calculate multipliers and offsets.

(Note that most SDI-12 sensors do not require a multiplier or offset

except to convert units of measure.)

• Set the SDI-12 Tx Change – This is the threshold which a calculated

value for the SDI-12 measurement must exceed in order to trigger a

data transmission.

Sensor Data Monitoring

• Set the Configuration Sensor Scan Interval – This is the interval on

which sensors will be read only while you are connected to the AL200

with the Device Configuration Utility software.

After configuring the AL200 settings, click the Apply button at the bottom of

the screen to send the changes to the device. It is a good idea to save the

configuration file for later reference.

7.1.2 Datalogger Peripheral

Main

• Set the Operation Mode to either ALERT2 on CS I/O, ALERT

Concentration on RS-232 or ALERT Concentration on CS I/O,

ALERT2 on RS-232 depending on what type of device the AL200

will be connected to.

ComPort

• If the AL200 is connected to a Campbell Scientific datalogger, select

the appropriate SDC address. When using the CS I/O port, it is not

necessary to configure the RS-232 related settings.

• If the AL200 is connected to an RS-232 device, configure the RS-232

Baud Rate, RS-232 Parity, and RS-232 Stop Bits to match the

device.

ALERT2

These settings will be unique to a particular station and to your network.

• Set the Station Source Address – This is a station ID number that

must be unique within the network. This is an integer between 0 and

65,501. A database of source addresses can be found at

www.alert2.org.

• Set the Frame Length – This is the total amount of time that all of the

stations in the network will report in. This is an integer with a

resolution of 500 ms between 500 and 43,200,000 (12 hours).

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Campbell-scientific AL200 ALERT2 Encoder, Modulator, and Sensor Interf Bedienungsanleitung Seite 18