Three Kinds of Rs485 Cable: Which One Will Make the most Cash?

This has thick stone walls and a concrete ceiling and has space to install 2 inverters and a battery system later if required. To get the solar PV power from the roof down to the basement shed, we purchased 20 meters of 6mm armoured cable; this was routed down the back of the house and into the shed through the stone wall. On the Raspberry Pi, we also installed a 1-Wire Pi Plus board, and this is used with a temperature sensor fitted in the shed to monitor the air temperature, which is also posted to the MQTT server and Home Assistant. 04), a Web485 board, and the necessary cables. If the PC is connected to the multiple Laureate instruments on an RS485 bus via an Ethernet-to-RS-485 gateway board or a USB-to-RS485 gateway board, use Laurel’s free XLOG2 datalogging software. The RS498 bus was working correctly, and we could read values from the device.

With the RS485 Pi connected to the energy meter, we could read the data but not from the inverter. Our plans to upgrade our solar PV system this year are slowly progressing with installing a new Solis 1.5kW inverter and an EM112 Series Energy Meter, which have RS485 output and communicate using Modbus protocol. These pins have to be connected to handshaking outputs at the PC side on the RS232 port. On some PLC models it is possible to mix RS232 and RS485 communications. The RS485 system used for Modbus communication provides a main cable (Bus or backbone), to which all the devices have to be connected with branches (also known as stubs) that are as short as possible. We installed a new Micro SD card with the latest Raspberry Pi OS, and after updating the software, the serial port and i2c bus were enabled. Once you've installed it, you can go to the application. Where can I find RS485 pinouts? Clicking into the item detail page and scroll down to read the reviews left by shoppers on our website, once you find an option of rs485 communication cable that catches your eye.

Using the Solis Data Logging Stick, which uses WiFi to communicate, we were able to set up the inverter to send data to the remote soliscloud service, but we could not find any way to get capture data apart from scraping the basic status page built into the WiFi adapter which only gave watts being produced and daily output. After several frustrating days of trying different combinations of RS485 hats, different wiring connections, with and without termination resistors and ordering a USB RS485 adapter which would also fail to connect, we tried to install the Data logging WiFi adapter. In order to avoid signal reflections, a 120 Ohm termination resistance must be fitted on each end of the main cable. The maximum number of devices that can be connected to a main cable is 32, including the Master. A Modbus RS485 connects a Master device to one or more Slave devices. It is interesting to measure the humidity of the ground, but we have also thought about other things; and then we have TXtemp to measure the temperature (one of the uses of TXtemp is in association with SuperClock), and for practically any type of measurement we have TXdata (RS232, RS485 ModBus) - which can be connected to thousands of existing third-party professional RS232 or ModBus meters (and there is something for all needs: temperature and humidity meters, anemometers, voltage meters, energy, light meters, water meters, presence sensors, brightness sensors, soil humidity sensors, etc. ; practically all professional meters are available in ModBus or RS232 standard; and not just meters).

Henceforth, we shall consider Slave devices to be measuring instruments with serial communication, even if the cabling is similar for all Modbus devices. Is there an easy way to log data to a PC from multiple instruments on an RS485 bus? Figure 1 shows an example of a correct Bus connection. With the Solis inverter connected to the Raspberry Pi, we were initially unable to communicate with the inverter, and the Python scripts returned connection errors. Removing the WiFi adapter and connecting directly to the inverter's COM port resulted in no data again so we knew that there was something on the WiFi adapter enabling the data from the inverter. The data COM port on the base of the Solis inverter uses a small round 4-pin plug with a screw thread to hold it in place when connected. Not only that, it can also be used to know if there is water in any place or not; for example, positioned appropriately, it can be used to know if a tank or a drinking trough is full or empty, or if a well has reached a certain level (eg to stop pumping water).

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