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The diferential range from +1.5V to +5V is a ‘1’ or mark and -1.5V to -5V is a ‘0’ or space. The area between -1.5V and +1.5V is undefined. It's good to note that when RS-485 is not driven, it is in a high impedance state. For CAN, the output diferential is slightly diferent where the two outputs, CANH and CANL data lines, are a reflection.
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May 10, 2017 · RS-485 output between 1.5V to 6.0V is allowed, and receiving side requires +/- 200mv. So a 120 ohm termination resistor must handle 0.3W. CAN bus standard says 0.25W, unless you want to handle short circuits to battery voltage. And RS-485 is about voltage levels, not current direction.
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Feb 21, 2024 · Data on the 3.3V CAN bus is transmitted using two states derived from the potential difference between CANH and CANL signals: Dominant state: When controllers send logic ‘0’, the state of the bus will be dominant, and the potential difference between CANH and CANL will be approximately 2V.
Jan 18, 2024 · CAN bus can be a preferable option if you require a real-time, high-speed communication protocol for an automotive or robotics application. RS485 can be a preferable option if you require a strong and dependable protocol for building automation or industrial automation.
Oct 4, 2022 · Oct 4 2022. Join Dave and Bob as they explore the similarities and differences between two key serial interface protocols, Controller Area Network (CAN) and RS-485. See both protocols on oscilloscopes using one of our RS-485 interface transceivers and our latest CAN transceiver.
Jan 27, 2021 · How CAN and RS‑485 work. To compare the advantages of CAN over RS‑485, let us look at the similarities and differences between the two standards ISO 11898–2–2016 and ANSI TIA/EIA‑485‑A....
CAN State . CAN Levels : 1 . A − B ≥ +200 mV : Recessive . CANH − CANL ≤ 0.5 V : 0 . A − B ≤ −200 mV : Dominant . CANH − CANL ≥ 0.9 V : recessiveare represented by the CANH and CANL voltage level s shown in . Figure 1. that compares CAN signaling to RS-485. This signaling method is fundamental
