RS-485 – The Details (2/4): Failsafe Biasing, Associated Protocol Simplifications скачать в хорошем качестве

RS-485 – The Details (2/4): Failsafe Biasing, Associated Protocol Simplifications

With demonstrations using Arduinos and TI SN75176B transceivers … ↓↓↓ Complete description, time index and links below ↓↓↓ In the last video we’ve introduced addressing to handle more than one slave on the bus and timeouts to bulletproof our communication against unresponsive slaves (link below). But there’s still a potential source of error. Let’s fix that now. First we have a look at the problem and the solution for it – failsafe biasing. Then we go through all the details and upgrade our hardware accordingly – with two more resistors. Finally, failsafe biasing allows us to greatly simplify our protocol. 00:00 Intro – removing source of error and simplifying protocol 00:53 Problem – receivers listening with no transmitter enabled 03:04 Solution – biasing the bus to above the threshold voltage 06:21 Assumptions – idle voltage, supply voltage, bus load 09:11 Bus Load – receivers as resistor plus termination resistors 12:07 Failsafe Resistors – failsafe current and voltage accross 13:28 Termination Resistors – one has to be recalculated 16:03 Failsafe Load – of failsafe resistors on the bus is significant 18:49 Placement – at one end or both ends of the bus 20:40 Demonstration I – the bus is now always in a defined state 22:29 Failsafe Receivers – are an alternative to failsafe biasing 24:28 Protocol – new version is simpler and saves one MCU pin 28:23 Code – for master and slave is also greatly simplified 32:31 Demonstration II – less action and more throughput 34:28 Wrap-up – next we tackle the full-duplex RS-485 bus, bye Tutorials    • Tutorials   RS-485 – The Basics (1/2): Principles, Topology, Specification, Performance    • RS-485 – The Basics (1/2): Principles...   RS-485 – The Basics (2/2): Simple Master-Slave Half-Duplex Setup    • RS-485 – The Basics (2/2): Simple Mas...   RS-485 – The Details (1/4): Timeouts, Addressing, Multiple Slaves    • RS-485 – The Details (1/4): Timeouts,...   RS-485 – The Details (2/4): Failsafe Biasing, Associated Protocol Simplifications    • RS-485 – The Details (2/4): Failsafe ...   RS-485 – The Details (3/4): Full-Duplex Bus, Interleaving Messages    • RS-485 – The Details (3/4): Full-Dupl...   RS-485 – The Details (4/4): Modbus, PROFIBUS, DMX    • RS-485 – The Details (4/4): Modbus, P...   RS-422 Differential Signaling (Renesas ISL8490, Arduino MCU) – The Basics (1/2)    • RS-422 Differential Signaling (Renesa...   RS-422 Differential Signaling (Renesas ISL8490, Arduino MCU) – The Basics (2/2)    • RS-422 Differential Signaling (Renesa...   RS-422 Differential Signaling (ISL8490, AdUM121N) – The Details (1/2)    • RS-422 Differential Signaling (ISL849...   RS-422 Differential Signaling (ISL8490, AdUM121N) – The Details (2/3)    • RS-422 Differential Signaling (ISL849...   RS-422 Differential Signaling (ISL8490, AdUM121N) – The Details (3/4)    • RS-422 Differential Signaling (ISL849...   RS-422 Differential Signaling (ISL8490, AdUM121N) – The Details (4/4)    • RS-422 Differential Signaling (ISL849...   My Code https://drive.google.com/drive/folder... STMicroelectronics, Application Note AN1690, Fail-safe biasing for ST485EB https://www.st.com/resource/en/applic... Texas Instruments, RS-485: Passive failsafe for an idle bus https://www.ti.com/lit/pdf/slyt324 Texas Instruments, Application Report, RS-422 and RS-485 Standards Overview and System Configurations http://focus.ti.com/lit/an/slla070d/s... #rs485 #arduino #mcu #microcontroller #tutorials #tutorial #how-to #robertssmorgasbord