Apogee Instruments SQ-647 소유자 매뉴얼 - 페이지 10

{카테고리_이름} Apogee Instruments SQ-647에 대한 소유자 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. Apogee Instruments SQ-647 18 페이지. Quantum light pollution sensor
Apogee Instruments SQ-647에 대해서도 마찬가지입니다: 소유자 매뉴얼 (16 페이지)

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OPERATION AND MEASUREMENT

The SQ-647 quantum light pollution sensor has a SDI-12 output, where photosynthetically active radiation is

returned in digital format. Measurement of SQ-647 quantum light pollution sensors requires a measurement

device with SDI-12 functionality that includes the M or C command.

Wiring

Sensor Calibration

All Apogee SDI-12 quantum light pollution sensor models (SQ-600 series) have sensor-specific calibration

coefficients determined during the custom calibration process. Coefficients are programmed into the

microcontrollers at the factory.

SDI-12 Interface

The following is a brief explanation of the serial digital interface SDI-12 protocol instructions used in Apogee SQ-

427 quantum light pollution sensors. For questions on the implementation of this protocol, please refer to the

official version of the SDI-12 protocol:

Overview

During normal communication, the data recorder sends a packet of data to the sensor that consists of an address

and a command. Then, the sensor sends a response. In the following descriptions, SDI-12 commands and

responses are enclosed in quotes. The SDI-12 address and the command/response terminators are defined as

follows:

Sensors come from the factory with the address of "0" for use in single sensor systems. Addresses "1 to 9" and

"A to Z", or "a to z", can be used for additional sensors connected to the same SDI-12 bus.

"!" is the last character of a command instruction. In order to be compliant with SDI-12 protocol, all commands

must be terminated with a "!". SDI-12 language supports a variety of commands. Supported commands for the

Apogee Instruments SQ-627 Extended Range PFD sensors are listed in the following table ("a" is the sensor

address. The following ASCII Characters are valid addresses: "0-9" or "A-Z").

http://www.sdi-12.org/specification.php

White: Positive (signal from sensor)

Red: Input Power

Black: Ground (from sensor signal and output power)

Clear: Shield/Ground

(version 1.4, August 10, 2016).