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We then added the 10K pull-up and pull-down resistors to the RS485 Pi board and connected it directly to the Solis inverter. 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. The adapter was placed under the microscope, rs485 cable and we traced the data A & B lines from the plug to the RS485 chip on the PCB. 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. We can also use this to upload to our long-term storage data logger online. We tried to build an organic system so that whoever gets a TXtemp, TXsoil sensor or a bridge for RS232 or ModBus sensors and devices like TXdata can immediately use them without wasting time in configurations (and we also took the opportunity to insert some things into our system some "extra" not foreseen by the standards!).

Two Tibbo Project System (TPS), Gen. 2-compatible Tibbo BASIC applications for the setup and testing of Bus Probes are available: BP-Tester-UI and BP-Tester-Web. But we didn't want to do a "closed system". You can enter the data relating to the MQTT Broker you want to use; the name of the Topic to be used to control it and to read the periodic transmissions of the humidity percentage is shown. After connecting as for point B, in the Settings it is possible to define a name for the device, and if the reading periodicity is less than 250 minutes, you can set an interval of hours in which the reading is not carried out / transmitted (for example you can disable the night). Inputs are daisychained to a second set of contacts for easy daisychaining. 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. If your PC or controller only has RS232 port then you need an RS232 to RS485 converter or adapter for your PC or controller.

The RS232-RS485 adapter circuit diagram is show below, RS232 DB9 is used as the RS232 port, while only a terminal block is used as RS485 connector. This is connected to the fuse box and has a 16 amp RCBO to protect the circuit. The product is sent in a shockproof box. Although many applications use RS-485 signal levels, the speed, format, and protocol of the data transmission are not specified by RS-485. The probes communicate using the standard Modbus RTU protocol. RS-485 is used as the physical layer underlying many standard and proprietary automation protocols used to implement industrial control systems, including the most common versions of Modbus and Profibus. Insulation/separator layer: This layer plays a role in insulation and enhances the durability and lifespan of the cable. According to the EIA there is a maximum of 32 Unit Loads on one cable segment. A Unit Load is defined as a passive transmitter (in OFF-state) plus a receiver. At the transmitter end the voltage difference should not be less than 1.5 Vdc and not exceed 5 Vdc. The difference between RS422 and RS485 is the fact that RS485 has the possibility to built a multi-point application.

At the receiver end the voltage difference should not be less than 0.2 Vdc. The data is coded as a differential voltage between the wires. If there are several sensors near and/or other data to be transmitted via GSM, it is more convenient to use Standard / RF versions supported on a concentrator or controller such as RXTXeasy GSM so you will be able to use one single SIM. Bus Probes can be configured and tested using our web-based test app (you will need to connect the probes to your PC or Android smartphone via our Web485 board). 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. 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. RS485 is a balanced serial interface for the transmission of digital data. This with WiFi transmission for the Standard version, and in the RF version also with radio transmission at 433MHz (covering longer distances and with less battery consumption thanks to special optimizations).