Campbell-scientific AL200 ALERT2 Encoder, Modulator, and Sensor Interf Bedienungsanleitung PDF herunterladen (Seite 27)

Appendix B. Cables and Connector Pin Descriptions

TABLE B-5. Radio Interface Pin Description

Pin Function

Freq. Select Frequency Select. Accommodate frequency selection during

operation by grounding selected pin on radio interface.

SW12V Switchable radio power supply

PTT Push-to-talk. Grounded during transmission.

G Ground

TX Transmit audio output

B.6 Sensor I/O Interface

The sensor I/O interface is a 5-pin screw terminal. A mating connector is

supplied (pn 28750).

TABLE B-6. Sensor I/O Pin Description

Pin Function

SE1 Analog voltage / current input

SW12V Switchable sensor power supply

P1 Switch closure input. Internally tied high to 5V.

G Ground

C1 Digital I/O for high/low status or SDI-12

B.7 GPS Input

The GPS input is a threaded SMA female connector.

TABLE B-7. GPS Input Pin Description

Pin Function

Center Conductor Socket RF Input, biased by 3.3 V for use with active

antennas

Shield RF ground

B-3

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Campbell-scientific AL200 ALERT2 Encoder, Modulator, and Sensor Interf Bedienungsanleitung Seite 27