I2c over rs485

  • EIA-485, also known as TIA/EIA-485 or RS-485, is a standard defining the electrical characteristics of drivers and receivers for use in balanced digital multipoint systems. This standard is widely used for communications in industrial automation because it can be used effectively over long distances and in electrically noisy environments.
I2C requires less hardware (no transceiver needed for I2C) but RS-485 can go for much longer distances and is more noise tolerant. I2C also has addressing automatically in it and multi-master systems are easier since I2C has recessive and dominant bits to help you arbitrate the bus when multiple masters are trying to transmit simultaneously.

We find that the smallness constraints lead to a device which communicates via Modbus RTU over RS485. There are other direct sensor buses like I2C, SPI, and CAN which also have their place as automation protocols , but in building automation, the size and scope of the network model presented by Modbus and its network model matches needs well.

Nov 17, 2020 · It communicates with the Raspberry Pi over I2C and does the servo control and ultrasonic reading, processing and filtering in a Pic microcontroller on the UltraBorg board. This leaves the Raspberry Pi free to perform tasks without worrying about timing, delays, or CPU intensive processes.
  • whereas CY7C65215A supports RS232/RS422/RS485 interfaces Two-channel configurable SPI interfaces Data rate up to 3 MHz for SPI master and 1 MHz for SPI slave Data width: 4 bits to 16 bits 256 bytes for each transmit and receive buffer per channel Supports Motorola, TI, and National SPI modes Two-channel configurable I2C interfaces
  • Jan 24, 2016 · When we first checked out the ATSAMD21 chip (the processor used in the Arduino Zero and Adafruit Feather M0), we were very happy to see that the chip has 6 "SERCOM"s, a.k.a SERial COMmunication modules. Each one of these modules can be used for I2C, SPI or Serial. That means you can have 3 UART's & 3 SPI's, or maybe 2 SPI's and 4 I2C's. Basically, you have a ton of options for adding more ...
  • The RS-485 standard specifies differential signaling on two lines rather than single-ended with a voltage referenced to ground. A logic 1 is a level greater than –200 mV, and a logic 0 is a ...

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    I2C requires less hardware (no transceiver needed for I2C) but RS-485 can go for much longer distances and is more noise tolerant. I2C also has addressing automatically in it and multi-master systems are easier since I2C has recessive and dominant bits to help you arbitrate the bus when multiple masters are trying to transmit simultaneously.

    I2C requires only two line(two wire), but those two wires can support up to 1008 slave devices. Unlike SPI, I2C can support a multi-master system, allowing more than one master to communicate with all devices on the bus (although the master devices can’t talk to each other over the bus and must take turns using the bus lines).

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    The main features of the physical layer ( RS485, RS232) and some recommendations are provided. Implementation classes are proposed to guide the At the physical level, MODBUS over Serial Line systems may use different physical interfaces (RS485, RS232). TIA/EIA-485 (RS485) Two-Wire...

    RS-485, RS-422 & RS-232; ... Some devices offer very good performance over a wide range of frequencies, while others offer unparalleled performance designed for a ...

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    It supports local I2C bus connection and standard Modbus RTU / RS-485 connection. It can be used to control pumps, valves, ventilators, shades, lights… and to capture temperature, statuses, values from different sensors / devices.

    The RS485 is predecessor to RS422 interface. It is a multidrop and balanced interface which uses half as well as full duplex communication modes. In RS485 single device can control upto 32 devices. Binary data of 1 is indicated when B>A by value of 1.5V (max.) and data of 0 is indicated when A>B...

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    Dec 01, 2020 · To select the RS-485 transceiver, CAN/RS485# signal needs to be driven low. This is handled automatically through the pinctrl-assert-gpios device tree entry. LPUART3 native RTS line is routed to the microSD card so a different GPIO (RS485_RE#/DE = GPIO3_IO24) is routed to the RS485 transceiver instead.

    Introduction to RS485. RS485 is a standard used extensively in serial communications systems. Only the electrical interface is defined by RS485. No specific communication protocol is specified by the standard; instead it forms the physical layer for many different protocols. For example a serial port may run over a RS485 physical link.

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    RS485 is the only of the interfaces capable of internetworking multiple transmitters and receivers in the same network. When using the default RS485 receivers with an input resistance of 12 kΩ it is possible to connect 32 devices to the network. Currently available high-resistance RS485 inputs allow this number to be expanded to 256.

    VAW RS485 Communication address table ■ RS485(Modbus RTU Mode). Output calibration NG. Explain ECI STATUS bit0~bit1:ECI.1~ECI.2; 0=untried 1:triged. Vaw RS485 table - 2013-1023. Initial Write/Read Note R.

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    Dec 14, 2017 · To allow an Arduino to speak over an RS485 network, an additional device must be used to convert TTL to RS485. There are several devices on the market that do this, but I used this RS485 Transceiver Breakout Board. Hardware Set-Up and Serial Ports. This picture shows my hardware setup. Because I’m using an Arduino Mega, 4 serial ports available.

    Dec 11, 2019 · RS485 is a standard for serial data transmission. Data exchanged through RS485 interfacing primarily uses the MODBUS protocol. RS232 devices use text (ASCII) protocols. This difference implies that needs to know about the MODBUS when using RS485 communication devices.

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    I2C is not built for long distances (max. some meters) But you can make it via RS485, But you will need to add termination resistors to each end.

    Remember I2C uses two wires and the data line is bi-directional. You might be able to do it with two independent Rs485 connections, one for clock and one for data but you might need some additional logic to set the direction of the data line.

RS485 5V click can be used for controlling various building automation systems, intelligent lighting systems (DMX), Point-of-Sale (POS) networks, and various other devices that need to establish a reliable communication over the RS422/485 bus.
I'm also trying to use I2C over cat5 for home automation with my custom pinout. The reason is cost, I want it be very cost effective and I2C components still at least 5 times cheaper than even attiny13 uC (AFAIU uC is required for CAN and RS485).
In the blade chassis, the Management Module (MM) interacts with every component. This interactions happens via the RS485 bus as well as the I2C bus. Each component identifies itself by responding to messages over the RS485 or I2C bus. The access is to nonvolatile storage that contains vital product data (vpd) fields.
I2C requires only two line(two wire), but those two wires can support up to 1008 slave devices. Unlike SPI, I2C can support a multi-master system, allowing more than one master to communicate with all devices on the bus (although the master devices can’t talk to each other over the bus and must take turns using the bus lines).