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RC termination - In some applications requiring low power you may not want to load the line with 120 Ω resistors at each end. What I want to be able to do is to communicate (or at least read from) the charge controller from a Raspberry Pi. RS485 is another protocol supported by the primary serial port on the QScreen Controller. Each device has a communication port with two terminals, which are indicated for the sake of convenience as A and B. In these two terminals the communication cable is connected so that all the devices that take part in the communication are connected in parallel. Now there was certain instances I used STP wire for rs485 because I had a lot of devices connected in a long run chain (DMX512 lighting fixtures). It seems if there is a lot of RFI in the installation, shielded twisted cable can be justified. After looking at all your links, I do not believe there is an actual Ethernet interface at all. The SCK pin’s synchronous clock signal has configurable phase, polarity and baud rate so that it can interface to a variety of synchronous serial devices. The mention of "Ethernet RS-485 communication interface" confused me.

The cabling of the industrial communication systems (Modbus RS485) is different in some ways from the cabling used for power cabling and the electrician may experience some difficulties if he is not an expert in Modbus communication networks. 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. A Modbus RS485 connects a Master device to one or more Slave devices. The maximum number of devices that can be connected to a main cable is 32, including the Master. The master and slave could even exchange ascii QED-Forth commands. You can implement the slave select lines by configuring Port A pins as outputs. Henceforth, we shall consider Slave devices to be measuring instruments with serial communication, even if the cabling is similar for all Modbus devices.

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!). The RS232 signals are represented by voltage levels with respect to a system common (power / logic ground). So I would not run low level MCU GPIO level signals over the cable wires. The standard C serial I/O routines such as printf(), scanf(), putchar(), and getchar() give you high level access to the serial ports. Each serial port can be configured for the RS232 or RS485 protocol, and runs at standard baud rates up to 115,200 bits per second. Yes, it would work for that too, but 24 awg cable with plenum grade jacket is the standard. But I notice that he describes using a (different) RS-485 to USB converter and splicing from the Ethernet cable to the converter, rather than using the converter cable that ships with the charge controller. I am working on a project that involves a Solar Charge Controller.

Simply using the provided USB converter cable is not working for me right now with the Pi. 2) right under WiFi settings, instead of WiFi TX to Hub / DisplayRX / RXeasy, choose the other settings and write your server / script URL. While running this program, the parity settings of Mosaic Terminal may be adjusted, and in each case the message that matches current settings will appear clearly while the other messages will appear garbled. But You stated you are going to install this at a commercial setting, so it always better to use the worst case environment situations, and use shielded cable. Be sure to use a wire pair such as the blue and blue/white pair for the data lines and a third wire or pair twisted together for the common connection. The serial data stream at the UART is conditioned by serial driver chips that transmit and receive the data. They are often used for serial connections going to a terminal server in datacentres, for example.

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