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hardware:wattmons:wattmonmega_intro [2018/09/07 09:23] jeff Multiple minor improvements |
hardware:wattmons:wattmonmega_intro [2021/09/13 05:57] |
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- | ======WattmonMEGA Overview====== | ||
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- | {{20170525_wattmonmega.png? | ||
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- | =====Wiring and Connections Diagram===== | ||
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- | {{20170525_wattmonmega_topview_diagram_20180902_edited_screenshot_from_datasheet_.jpg|Topview Connection Diagram (WattmonMEGA)}} | ||
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- | =====Power Requirements===== | ||
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- | WattmonMEGA can run on a DC power source between 6 and 60V DC. It has a built in high efficiency switching buck regulator that ensures that it consumes less than 2 watts of power without accessory devices. The device can be shipped with an AC adapter or a DC power cable to be directly connected to your battery bank of up to 48V DC. | ||
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- | =====Connectivity===== | ||
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- | WattmonMEGA has two ways of connecting to the Internet. The built-in 100 Mbps LAN can be connected directly to a laptop or router, and is used for setup and local monitoring (but can also be used for remote monitoring if the site has an Internet connection). The USB Host port works with a selected number of USB Cellular dongles (GPRS, 3G and 4G LTE), allowing both outbound and inbound data via the Internet. Although we provide instructions on configuring your local dongle, not all of them work. Need a compatible USB dongle for remote monitoring? Use one of our Huawei dongles, the [[hardware: | ||
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- | =====Hardware Features===== | ||
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- | ====Serial (RS-232)==== | ||
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- | An [[how_tos: | ||
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- | ====Modbus RTU (RS-485)==== | ||
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- | An industry compliant RS-485 Modbus RTU interface is built in and the [[hardware: | ||
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- | If you are planning to monitor a battery bank with the [[hardware: | ||
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- | See [[hardware: | ||
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- | ====Inputs and Outputs==== | ||
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- | The inputs and outputs and their various applications are described below. | ||
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- | ===4 digital Inputs=== | ||
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- | Pins 16-19 are digital inputs. They are opto-isolated and can handle anywhere between 4 and 24V DC between the input pin and the DIGND pin. Pins 16-18 (DI1-DI3) can also be configured as pulse/ | ||
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- | ===4 digital Outputs=== | ||
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- | These are open collector type (using a ULN2003 chip) and can be directly connected to 12V relays (with external power supply) to control high power loads - they can handle up to 500mA per pin. | ||
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- | ===Onboard Relay=== | ||
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- | An on-board latching relay can switch DC or AC loads of up to 5 A. If higher loads are required, this relay can be used to power a larger one. The latching relay takes very little power to switch state and no power once toggled, so there is no difference in power draw whether the relay is on or off. | ||
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- | ===3 Analog Inputs=== | ||
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- | WattmonMEGA has three analog input channels, each with a 12-bit <tooltip title=" | ||
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- | A1 also doubles as the <tooltip title=" | ||
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- | A2 is a voltage sense input that can be used to measure up to 330V DC for high voltage battery banks. The negative voltage terminal is shared with the main ground on pin 1. | ||
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- | A3 is used to measure up to 5V DC, perfect for sensor inputs from devices such as the PYRA300 Solar Irradiation Sensor or pH meters. | ||
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- | ===OneWire Bus=== | ||
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- | WattmonMEGA has a Dallas OneWire bus that allows for DS18B20 temperature sensors to be connected. This can be used for ambient or battery temperature measurement. You can connect up to 8 sensors per device. See here for more information: | ||
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- | ====Storage==== | ||
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- | A removable/ | ||
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- | WattmonMEGA has 512 KB RAM (enough space for about 200 KB of added user variables and scripts). | ||
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- | There is also 8 KB of <tooltip title=" | ||