The Upside to What Is Rs485 Cable

Unit Load: The network’s unit load impacts the number of devices that can be attached to it. Ethernet was also better understood by a larger number of people, and that pushed me even further towards its use (I would not be on set at all times, so using familiar tech is important!). 4 Definitely. But it was out of our control-miles of cable was already installed under the floor by the time we arrived on set. What is rs485 cable? RS485 RS-485 is a standard that allows high speed data transmission along with multiple transmitters and receivers and this makes it able to be incorporated as a network solution. What it does is that's after sensing the temperature in the room and yet when you're making adjustment to the thermostat, it actually sends the data to the controller, which could be controlling that, the temperature, turning on and off the AC to heat or cool the room up.

We also needed to figure out a way to wire the buttons and LEDs into whatever computer application we built that would aggregate the button press data, present it to the video producers in real-time, and allow them to control the room LED lighting as well (sometimes based on vote data, other times set as the producers wanted for a camera shot). RS485 is also used in performance venues to control lights and systems such as the one shown below. However the other standards that have been introduced more recently provide higher levels of performance that are very useful in may applications. Each of these standards meets a different requirement. RS485 is used as the physical layer for many standards and proprietary automation protocols to implement control systems, most commonly Modbus. I2C worked, so I could control the relay HAT, but it looked like I was going to have to poll the GPIO pin instead of use an interrupt (so button presses could be detected for 'free' using the rising edge signal), and I didn't want to have to do that. Little did I know the official Raspbian image for the Le Potato didn't support interrupts when programming GPIO pins with the gpiod library.

We ordered 110 Potatoes ('Spuds' as I got to calling them, thinking of the 100 rooms as a 'spud farm'), and I got to programming. But to avoid the wiring nightmare that would be required wiring up 100 rooms across the footprint of a football field, we went with the second option. We were working off the photo above, and were told we would be in charge of wiring up two buttons and some LED lighting in each room (there would be 100 of these rooms laid out in a football-field-sized studio). If it were a local one then there would be two different ground symbols. That requirement was later expanded to three buttons (and for a time, three buttons with an LED individually controllable inside each one) and six strips of LED tape in each room. But for the initial equipment purchase, we had assumed two buttons and one or two strips of LED tape (oops). Speaking of unshielded Cat5, it was also used to hook up the LED strips instead of 5-pin 22 gauge LED wire, and initially I assumed there would just be one LED strip (maybe two) per room.

The recommended arrangement of the wires is as a connected series of point-to-point () nodes, a line or bus, Ideally, the two ends of the cable will have a termination resistor connected across the two wires. The black is all SDI (two GoPros per room), and the rest are Ethernet. Unfortunately, Ethernet-enabled microcontroller designs that are available for immediate purchase, in bulk are few and far between, and many of the accessories that add Ethernet to existing dev boards are prohibitively expensive (compared to just buying an SBC) and would require extra setup time per room-that was another thing we were trying to minimize. It does not provide any degree of isolation such as Ethernet. Optical isolation is the cure for this problem. Quote: The most direct, and in a sense the most important, problem which our conscious knowledge of Nature should enable us to solve is the anticipation of future events. ● If there are too many loads, such as more than 30 units on a bus, it is recommended to use 485 HUB to solve the problem. ● If the communication distance is too long, such as over 500 meters, it is recommended to use a repeater or 485 HUB to solve it.