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Chapter 3 • Planning
13
3.8.2
Reference Cell/Temperature Sensor Specifications
•
Solar Cell: Mono-crystalline Silicone (1.96in x 1.3in)
•
Output: 4–20mA
•
Range: –20° C to 70°C
•
Irradiance Accuracy: +/- 5%
•
Temperature Accuracy: +/- 2%
•
Housing: 3.3W” × 1.5H” × 5.7L” Powder coated aluminum, IP65
•
Weight: 8.8oz
3.9
Communication Module
The weather station includes a data acquisition module that provides
analog-to-digital conversion. The modules can be remotely controlled
using a set of commands, the Modbus RTU protocol. Communication
between the module and the SolarMagic Internet gateway / data logger
is via Modbus RTU over 2-wire RS-485 twisted pair. The weather
station module is set to 9600 baud in manufacturing for a more robust
communications network, and typically Modbus address 2.
3.9.1
Communication Module Specifications
The M-7017C is an 8-channel current input module.
•
Channels: 8 current inputs
•
Input Range: 4–20mA, ±20mA, or 0–20mA
Figure 3-7.
Reference
Cell/Temperature Sensor
Summary of Contents for SolarMagic
Page 1: ...SolarMagicTM Weather Station User Guide...
Page 4: ......
Page 32: ......
Page 33: ...Appendix A Reference Diagrams 27 Appendix A Reference Diagrams...
Page 34: ...National Semiconductor SolarMagic Weather Station User Guide 28 A 1 1 Sensor Terminal Blocks...
Page 35: ...Appendix A Reference Diagrams 29 A 1 2 Communications Power Terminal Block...