They take over at high frequencies while the regulator is really meant for DC and "DC-like" low-frequencies. While the standards bring uniformity to data communications, many areas are not specifically covered and remain as "gray areas" for the user to discover (usually during installation) on his own. 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. So I would not run low level MCU GPIO level signals over the cable wires. If one or the other end fail to see the heartbeat packets come or get acknowledgement of them then know that your cable is either disconnected or has broken wires. So take advantage of that and let your systems MCUs implement heart beat handshaking directly though the RS485 communications layer using appropriately designed small packets.

For these secondary devices you have to implement your periodic heart beat check in some device specific way. Unlike what happens in many energy distribution systems, the manner in which the devices are connected in parallel is important. It is interesting to measure the humidity of the ground, but we have also thought about other things; and then we have TXtemp to measure the temperature (one of the uses of TXtemp is in association with SuperClock), and for practically any type of measurement we have TXdata (RS232, RS485 ModBus) - which can be connected to thousands of existing third-party professional RS232 or ModBus meters (and there is something for all needs: temperature and humidity meters, anemometers, voltage meters, energy, light meters, water meters, presence sensors, brightness sensors, soil humidity sensors, etc. ; practically all professional meters are available in ModBus or RS232 standard; and not just meters). The Electronics Industry Association (EIA) has produced standards for RS485, RS422, RS232, and RS423 that deal with data communications. AddressingSerial; allows multiple sensors to be connected to any RS485 or SDI-12 data logger via a single cable.

Up to 10 WIRED PROs can be connected to SENSEWAY within a total range of 100m of RS485 cable. This way you can extend the RS422 signal for up to 4000 feet. 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. The only way this would not work is if the secondary device only takes "write only to device" transmissions with no possibility of any acknowledgement or return result. In all other cases, half duplex and full duplex will work equally well. 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).

RS485 communication cable, then connect back of the DVR panel. I recently bought some RS485 cable, it had two pairs, both had stripes. The switch version requires a DC average of 0V on the communication lines, which Ethernet satisfies but RS485 doesn't. 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". Watch out for bargains. They are often used for serial connections going to a terminal server in datacentres, for example. Similar to Original Bobuino; ATMega1284, RS232 port, FTDI FT232RL USB, SD Card Socket, Screw terminals for 4 serial ports, power, 2 input buttons, 3 switch closures, additional SPI-Dual UART with RS485 interface drivers, 3 additional Status LEDs, Arduino shield compatible. We start with including the standard library for driving the LCD and declare the D8 pin of the Arduino Nano as an output pin which we will later use to declare the MAX485 Module as a transmitter or Receiver. The output of that switcher could be anything you want, including multiple outputs at different voltages.