All Questions
15
questions
1
vote
2
answers
123
views
How to isolate RS485 (A and B) from existing transceiver? Check attached circuit diagram, is it correct?
I have a controller with an RS485 transceiver, specifically the IS8489EIBZ-T, which is not isolated. I want to connect a BMS system to the output of this transceiver. After some research, I found a ...
10
votes
7
answers
2k
views
Puzzle how isolated RS-485 (ADM2582) sends signal without signal ground
Galvanically isolated RS-485 surely needs a signal ground, which leaves me puzzled about the following circuit -- which apparently sends the RS-485 signal correctly without the isolated grounds being ...
- 15k
0
votes
1
answer
40
views
Isolate modus IC
I want to isolate the RO, DI, and RE/DE pins going to the microcontroller. Can someone suggest what sort of IC would be appropriate for this application?
I wanted to use the FOD8012AR2, however, I see ...
- 2,391
0
votes
1
answer
426
views
How to isolate 5V supply for RS485 (low profile & cheap)
I'm building a RS485 transceiver module and I wanted to isolate the power and data.
I am going for a solution wiht a digital isolator (such as TI ISO7721DR) and a power isolator followed by a RS485 ...
- 81
1
vote
0
answers
3k
views
How to interface a Raspberry Pi Pico to DMX / RDM
Years ago, I was looking at creating a stage DMX controller using AVR. Time moved on and the Raspberry Pi Pico has now been released. I'd like to revisit the project using a Raspberry Pi Pico, which ...
- 123
0
votes
0
answers
48
views
Sharing Isolated Power supply for CAN and RS485
I am using ISO1432 from TI for isolated RS485 transceiver function. And ISO1042 for Isolated CAN transceiver. Both devices requires an isolated supply on bus side. Can I use one isolated 5V DC-DC ...
- 172
1
vote
1
answer
62
views
Isolating an existing RS485 tranceiver
I have a heat pump with an RS485 interface. Via a simple RS485 chip. No isolated interface, no isolated power supply to it.
I want to add a power meter at 400+ meter to it and want to properly isolate ...
- 325
1
vote
2
answers
665
views
Reverse-engineering RS485/Mechatrolink-II front-end design
I'm trying to reverse-engineer Mechatrolink-II front-end circuitry. Its physical layer is simple RS485 (with isolation transformer) running at ~10Mbps.
Here is the schematic I obtained from the PCB of ...
- 128
1
vote
1
answer
3k
views
Rs-485 isolation
Hi,
I have RS485 communication circuit as shown in figure. But it has no isolation, only SM712 is used for ESD protection. Now, i think it will be better to isolate the it.So, how can i isolate it? ...
- 105
0
votes
2
answers
1k
views
Differential signal isolation
In differential signal circuits (specifically, RS-485), there is usually an isolation between the signal processing / generation stage (eg, microprocessor) and the line driver chip (something like a ...
- 127
6
votes
3
answers
2k
views
RS 485 ground signal and chassis
I have a shielded twisted pair running from one device polling several devices in an RS 485 loop. The conditions:
The devices are in parallel as they should be.
The termination resistors are in ...
- 61
0
votes
1
answer
254
views
synchronise many microcontrollers
In my project I'll use modbus protocol for serial communication over RS485. There are more than 320 slaves which separated equally in 2 groups. Every 16 slaves are powered from the same supply and ...
- 23
4
votes
2
answers
732
views
RS-485 best isolation practices
There are several isolated solutions on the market such as ISO1176DW. These ICs usually pretty big, expensive and consuming.
However I could use non isolated transceiver with isolated power supply ...
- 3,012
0
votes
1
answer
1k
views
Connection between MDB Peripheral and Arduino
I'm working on making a custom vending machine controller using an Arduino as the master. The bill acceptor I'm using implements the MDB communication protocal, which is (I think) a variant of RS-485. ...
- 101
6
votes
2
answers
7k
views
RS-485 isolation required?
I would like to confirm my understanding.
Suppose I want to have two battery-powered MCUs inside an (unmanned) aircraft communicate with each other via RS-485. If those MCUs are powered from the same ...
- 1,845