But if you are building a control system with these development boards over a distance greater than 10 to 15 meters, then you should take the noise and signal power into consideration because if you want your system to work reliably, then you cannot afford to lose the data while transferring. Noise in the range of ±200 mV is essentially blocked due to common-mode noise cancellation. Typical line voltage levels from the line drivers are a minimum of ±1.5 V to a maximum of about ±6 V. Receiver input sensitivity is ±200 mV. But there are some limitations to it as it cannot support multiple slaves and multiple masters and the maximum data frame is limited to 9 bits. The M bit, with mask 0x10, determines whether eight or nine bits total are transmitted with each byte, regardless of whether or not the most-significant bit is a parity bit. It is very well documented and widely used and it also has a parity bit to allow for error checking. I would highly discourage the use of extra signal pins in the connectors for "cable connected" checking that do not meet the same specs as the RS485 signalling signals. To make sure that your USB to RS-485 cable & the device RS-485 port are working, have you tried using them with a Windows PC and the manufacturer's s/w?

The mention of "Ethernet RS-485 communication interface" confused me. I'm mostly used to ethernet with a pair consisting of completely solid and white with a stripe. One was mostly blue with a white stripe and the other was white with a blue stripe. Large phone cables have solid with white stripes, and solid. Twisted pair also allows the transmission speeds to be much higher than what is possible with straight cables. Is the striping set by manufacturers or have any meaning beyond indicating a pair? If you have already downloaded the program, you are ready to go. Also, RS485 drivers are able to withstand "data collisions" (bus contention) problems and bus fault conditions. This works well and prevents the existence of ground loops, a common source of communication problems. 32 P-channel MOSFET board with screw terminals - when you need to Source current vs sink current. You need a special Ethernet cable for realizing this communication protocol.

After looking at all your links, I do not believe there is an actual Ethernet interface at all. There is a huge benefit of the RS-485 electrical layer protocol that allows for long distance communications in the presence of multiple volts of common mode voltage differences between the two ends. For example, at 4800 baud (bits per second), each bit lasts about 200 microseconds (µs), and if communications are full duplex (e.g., if the QScreen Controller echoes each incoming character), then there is a serial interrupt every 100 µs or so. Like RS232, the data bits are transmitted in reverse order, with the least significant bit transmitted first. UART is an Asynchronous transmission device hence there is no clock signal to sync the data between the two devices instead it uses start and stop bits at the start and end of each data packet respectively to mark the extremities of the data being transferred. For devices where you have to consider the devices at the far end of your cables to be unable to be modified, either hardware or software wise, you have to get clever regarding how you determine if the device is connected.

Ethernet. I know RJ45-RJ45 cables are often colloquially referred to as Ethernet cables, but that isn't their only use. There are many categories of Ethernet cables we can use like CAT-4, CAT-5, CAT-5E, CAT-6, CAT-6A, etc. In our tutorial, we are going to use CAT-6E cable which has 4 twisted pairs of 24AWG wires and can support up to 600MHz. It is terminated at both ends by an RJ45 connector. Note that this Hackster project does something similar with splicing an ethernet cable to a UART breakout module. So I would not run low level MCU GPIO level signals over the cable wires. There are many different types of serial communication protocols like I2C and SPI which can be easily implemented with Arduino and today we are going to look at another most commonly used protocol called RS485 which is very commonly used in high noise industrial environments to transfer the data over a long distance.

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