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The device ships with an Ethernet RS-485 communication interface as well as a RS-485 to USB cable, which is said to be able to communicate with a PC using proprietary Windows based software (and driver, I think). 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. What I want to be able to do is to communicate (or at least read from) the charge controller from a Raspberry Pi. I am working on a project that involves a Solar Charge Controller. Note that this Hackster project does something similar with splicing an ethernet cable to a UART breakout module. Hah, for five years from now I wanted to repurpose the RJ10 phone modem connector on my Dell notebook with a mini PCIe CAN/RS485 card and some extra cable.

Visual indication of Tx and Rx traffic via LEDs in the transparent USB connector. Simply using the provided USB converter cable is not working for me right now with the Pi. It seems if there is a lot of RFI in the installation, shielded twisted cable can be justified. In summary, the code provided for implementing the second serial port is very flexible and can be used to support dual concurrent communications ports. It does not specify or recommend any communications protocol; Other standards define the protocols for communication over an RS-485 link. This works well and prevents the existence of ground loops, a common source of communication problems. It gets away most of the time with this configuration, rs485 cable with the shield draining noise and providing the ground reference at the same time. The shield works as a "drain" for any noise that could be picked up by the RS485 network and "drain" it to ground.

And even worse, if you have a non opto-isolated device installed on that network, any noise could "drain" to ground through the device itself instead of flowing through the ground terminal at the end of the line, damaging the device in the process! For an on, space or logic 0 state, the driver's A terminal is positive relative to the B terminal. UART interface support for 7 or 8 data bits, 1 or 2 stop bits and odd / even / mark / space / no parity. Each packet contains 1 start bit, 5 to 9 data bits (depending on the UART), an optional parity bit, and 1 or 2 stop bits. It is very well documented and widely used and it also has a parity bit to allow for error checking. The SPE bit turns on the SPI system. If you are using the QScreen as a master device, each external SPI device will require a separate select line (/SS). The SPI can transfer data much more rapidly than an asynchronous serial link - its maximum rate is 2 Megabits/second.

The UART Wildcard supports any baud rate produced by the above formula. Is it necessary to do the ethernet cable splicing as indicated in the above link, or should I simply be able to use the provided USB cable? 4V out as the regulator saturates), and the extra 2V above that allows for some noise-induced "wiggle". AddressingSerial; allows multiple sensors to be connected to any RS485 or SDI-12 data logger via a single cable. Entire USB protocol handled by the electronics in the cable. RS232 has numerous handshaking lines (primarily used with modems), and also specifies a communications protocol. Serial 2 is implemented by a software UART in the controller’s QED-Forth Kernel that uses two of the processor’s PortA I/O pins to generate a serial communications channel. One uses the data lines for 10/100 Ethernet, so that there are still 2 unused pairs in that cable. The USB-RS485-PCBA converter provides a USB to RS485 serial interface with a simple USB type A connector and PCB for easy integration into a design or as the basis of a converter cable. What company makes the driver for the RS485 converter?