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We found that there are 10K ohm resistors fitted on the A & B data lines with the A channel having a 10K pull-up resistor to 3.3 volts and the B channel having a 10K pull-down resistor to ground. We then added the 10K pull-up and pull-down resistors to the RS485 Pi board and connected it directly to the Solis inverter. RS485 uses two wires and sometimes a ground connection, so we used a twin-screen cable to go between the inverter to the EM112 Series Energy Meter and then onto the Raspberry Pi with a DB9 connector connected to the RS485 Pi board. The twin consists of two conductors that are twisted together. The main difference is, that pin 1 and 6 on the RJ11 socket of the MJ20-PRG module are used as power supply. Works with 4 AA batteries (1.5V, alkaline or Lithium - for outdoor winter use you need to use AA lithium batteries because the alkaline ones suffer from the cold); on request it is also available for working with external 5V power supply. Capabilities are used in the converter system made according to the following statement: monitoring parameters NCP series controllers, Modbus TCP network, handling controls: MN300, MN440, MN500, MN620, and heat meters - Mbus, the possibility of a software change controls, administration of the converter through a local or external PC terminal (TELNET), downloading and saving configuration files and files with FTP-client data (data downloaded, read and written by the application visualization once a day - which ensures the continuity of their records in the form of graphs), data storage (512 kB RAM with battery backup - data are recorded every 10 min, for 72 hrs.).Control and monitoring heat in Kolobrzeg installed by a company PUP SPIN SA in cooperation with the company TechBase Sp.

This shields the inner data wires from external interference. With the RS485 Pi connected to the energy meter, we could read the data but not from the inverter. The RS498 bus was working correctly, and we could read values from the device. A Modbus RS485 connects a Master device to one or more Slave devices. To connect an RS485 device or RS485 network to any PC or controller, the PC or the controller should provide RS485 interface also. RS485 interface gives some more benefits compared to RS232: simplicity and the robustness for long distance transfer. In order to increase the extent of the Modbus network, repeaters can be used; and signal amplifying and regenerating devices provided with two communication ports that transfer to each what they receive from the other. RS485 is simpler because it uses only two wire (or a single pair) to carry out the data in bidirectional manner, using RS232, we need 3 wires at minimum to carry the data bidirectionally. In three-phase systems without distributed neutral in which the loads are balanced and symmetrical, an insertion can be made, i.e. two current transformers instead of three can be used; the instrument will calculate by difference the third phase which is not measured directly, considering it as identical to the other two.

For example, Belden 3105A cable can be specified, but different types of cable with equivalent characteristics can be used. The only possible reference is the reading of the displayed value, for example, of the current. Choosing an analog instrument ensures good reading stability, due to the mechanical inertia of the needle and the fact that the reader immediately knows whether the instrument is operating normally or if the reading is out of range. This is how we wanted to use the data with Home Assistant reading the MQTT data from the broker. Following being scammed by the Zero Home Bills solar panel supplier, we placed an order with another supplier whose website showed that they had the panels we required in stock, but after a few days, they contacted me to say they did not have them, and the website hadn't been updated for a long time. To mount the new panels, we ordered 4 x 3.3m mounting rails and associated fixings and brackets from Dragons Breath Solar, who have been very helpful when selecting the hardware needed.

We found panels produced by JA Solar which are 1689 x 996mm and have a 330W output, and we could fit 5 or 6 of these on the roof between the chimneys. They are now looking for alternative panels which are similar dimensions to fit across our roof. To get the solar PV power from the roof down to the basement shed, rs485 cable 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. RS-485 can send data 1200 meters on cable. Using a repeater, the main cable is divided into different segments, each of which can be up to 700 m in length and connect 32 devices (this number includes the repeaters). The VR-18 Paperless Chart Recorder can be connected to a PC with an Ethernet cable allowing students to use the Brainchild's FREE software, allowing for streaming live data or downloading the data to an Excel spreadsheet to further manipulate the information for reports and assignments. Teachers can set up the display to a projector, allowing an entire class to view the data representations, and students can print the data collected from any of the display formats.