Campbell-scientific AL200 ALERT2 Encoder, Modulator, and Sensor Interf Manuel d'utilisateur télécharger pdf (Page 13)

AL200 ALERT2 Encoder, Modulator, and Sensor Interface

RS-232 Port

DCE

Configurable baud rates, parity, stop bits, and timeout

ElA/TIA-232 and V.28/V.24 Signaling

± 15kV ESD protection

Test Button

The test button located in the lower left hand corner of the AL200 serves

two functions. Pressing it for three to six seconds will trigger a test

transmission containing the latest data available to the AL200. Pressing

the button for longer than 6 seconds will cause the AL200 to generate a

test tone and sustain it for 5 seconds. If the AL200 has been configured as

a datalogger peripheral, only the test tone functionality is active.

Analog Radio Interface

Removable screw terminal connector, 0.15” pitch

Transmit only

Transmit Audio (Tx), 100 – 1000 mV peak-to-peak, software adjustable

Switched Voltage (SW12V), switched supply voltage, 1.8 A at +70°C

Sensor I/O

Removable screw terminal connector, 0.15” pitch

Switch closure (P1)

Internally pulled up to 5 V

16-bit counter

3.3 ms time constant for debounce

5 ms minimum closed time, 6 ms minimum open time

Single-ended analog (SE1)

16-bit Adc

0-5 Vdc

± 12 mV accuracy

80 µV resolution

50 dB rejection at 60 Hz

Software configurable as millivolt or milliamp input

Precision 100 Ω current sense resistor when configured for

milliamp input

Digital I/O (C1)

Software configurable as status (high/low) or SDI-12 input

Status Low 0 to 1.4 Vdc, High 3.5 to 5.0 Vdc

SDI-12 limited to 1 address, 1 value

Transient voltage surge (TVS) and gas discharge tube (GDT)

protected

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Campbell-scientific AL200 ALERT2 Encoder, Modulator, and Sensor Interf Manuel d'utilisateur Page 13