RS-485 – The Basics (1/2): Principles, Topology, Specification, Performance

Описание: With demonstrations using a function generator and TI SN75176B transceivers …
↓↓↓ Complete description, time index and links below ↓↓↓

In late 2021 I covered the RS-422 basics and details in six videos (links below). Now let’s talk about RS-485, which kinda is an evolution, respectively, extension of RS-422. Stuff already explained in the RS-422 videos will not be repeated in this series.

First we have a look at my bench, where a 1MHz logic level square wave is transmitted as differential signal using two RS-485 transceivers. Then we talk about bus topology, specification and performance. Finally we turn things up to 10MHz.

00:00 Intro – RS-485 kinda is an evolution/extension of RS-422
01:11 Principles – eerily similar to RS-422, but slightly different
11:13 Topology – RS-485 is a bus, RS-422 is point to (multi) point
15:00 Specification – differences to RS-422, TI SN75176B datasheet
22:53 Performance – speed vs distance and number of transceivers
XX:XX Wrap-up – next we’re using RS-485 with an Arduino MCU, bye

Tutorials    • Tutorials  
RS-485 – The Basics (1/2): Principles, Topology, Specification, Performance    • RS-485 – The Basics (1/2): Principles, Top...  
RS-485 – The Basics (2/2): Simple Master-Slave Half-Duplex Setup    • RS-485 – The Basics (2/2): Simple Master-S...  
RS-485 – The Details (1/4): Timeouts, Addressing, Multiple Slaves    • RS-485 – The Details (1/4): Timeouts, Addr...  
RS-485 – The Details (2/4): Failsafe Biasing, Associated Protocol Simplifications    • RS-485 – The Details (2/4): Failsafe Biasi...  
RS-485 – The Details (3/4): Full-Duplex Bus, Interleaving Messages    • RS-485 – The Details (3/4): Full-Duplex Bu...  
RS-485 – The Details (4/4): Modbus, PROFIBUS, DMX    • RS-485 – The Details (4/4): Modbus, PROFIB...  
RS-422 Differential Signaling (Renesas ISL8490, Arduino MCU) – The Basics (1/2)    • RS-422 Differential Signaling (Renesas ISL...  
RS-422 Differential Signaling (Renesas ISL8490, Arduino MCU) – The Basics (2/2)    • RS-422 Differential Signaling (Renesas ISL...  
RS-422 Differential Signaling (ISL8490, AdUM121N) – The Details (1/2)    • RS-422 Differential Signaling (ISL8490, Ad...  
RS-422 Differential Signaling (ISL8490, AdUM121N) – The Details (2/3)    • RS-422 Differential Signaling (ISL8490, Ad...  
RS-422 Differential Signaling (ISL8490, AdUM121N) – The Details (3/4)    • RS-422 Differential Signaling (ISL8490, Ad...  
RS-422 Differential Signaling (ISL8490, AdUM121N) – The Details (4/4)    • RS-422 Differential Signaling (ISL8490, Ad...  
Texas Instruments, Application Report, RS-422 and RS-485 Standards Overview and System Configurations http://focus.ti.com/lit/an/slla070d/s...
RS-422 CableLength-DataRate by EE JRW - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index...

#rs485 #arduino #mcu #microcontroller #tutorials #tutorial #how-to #robertssmorgasbord