All Questions
58
questions
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29
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ATTINY85-20SUR and serial communication
I am trying to use this chip ATtiny85 for serial communication. So my question is, would you recommend using it for serial communication, such as storing names, IDs, data, and last operations? Should ...
- 21
0
votes
2
answers
115
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Why are there two wires connected to each terminal of the RS485 port in energy meters
I want to connect the energy meters of our clients to a gateway so that the gateway can communicate with the meters using Modbus. I have visited several electrical rooms that have gateways installed ...
- 335
0
votes
0
answers
140
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How fast can a Schmitt trigger operate? Can I use it for signal conditioning digital serial data?
I would like to know if I could use a Schmitt trigger chip (e.g., 74HCT14, CD40106B and 74AC14) to clean a 12MHz serial digital signal that has gone through a long cable and will pass through multiple ...
- 423
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votes
1
answer
136
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Unable to read data through a MAX485 module
I used arduino code in order to grab RS 485 data from a sensor.
The middleman is a MAX485 module.
However, I was unable to read the data, even with code that works from previous examples.
I hooked up ...
- 1,369
0
votes
2
answers
162
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RS485 Communication Issue: Garbage Values on OLED Display
Hello Stack Exchange community,
I am currently working on a project involving two Arduino Nano boards connected via RS485 communication using MAX485 chips. I have set up the connections between the ...
- 3
0
votes
1
answer
527
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MAX3362 RS485 IC connection with ESP32
I am using MAX3362 RS485 serial data transfer IC with ESP32. Marked pins 1, 2 and 3 are connected to GPIOs of ESP32. Do I need to add any additional pull-up resistors or some termination resistors or ...
2
votes
2
answers
244
views
Reason to have MSB in a serial communication always high
I'm working on a code (written by other people) that uses a custom protocol to transmit data over RS485 in 8-bit packets.
For some reason, the protocol is built so that every 8 bits transmitted are ...
- 315
0
votes
1
answer
179
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Read Hikvision camera on PC over RS485 [closed]
I have a Hikvision IP camera. I can login onto the camera and stream live video through hikvision website.
However, the connection of the ip camera to the PC is via ethernet, which is limited to only ...
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1
vote
1
answer
231
views
MAX485 wrong data output
I want to convert USART signals to RS485 with the circuit below:
I log the data on the USART6_TX and 485A/485B at the same time, but the data on the output pins of the MAX485 is wrong and it's not ...
- 335
1
vote
2
answers
1k
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Is it possible to use an RS232-USB cable (with an FT232RL chip) for RS485-USB communication?
I have a standard RS232 to USB cable found on Amazon.
It does not work out of the box. This is what I expect since RS232 uses a ground reference and RS485 uses a differential between the two data ...
- 51
0
votes
1
answer
490
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SN75176 with 3.3V
Can I connect the SN75176 RS485 transceiver with a 3.3V microcontroller? The datasheet says that it must be powered with 5V and all inputs / outputs are TTL, but I'm not sure since the minimum high ...
- 427
0
votes
3
answers
432
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Reverse Engineering RS-485 Signals - Floating Issue
I'm currently trying to reverse engineer RS-485 signals, see waveforms below.
As you can see, Signal 1 (Yellow) and Signal 3 (Purple) are a differential pair and seem to be floating.
Here's a closeup ...
-1
votes
2
answers
341
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10m wired connection: I2C Repeater or RS485 [closed]
I need a wired connection between one Master and several (5-10) slave devices. I've considered UART, SPI, I2C, RS232 and RS485. In the end, I've narrowed down the options to I2C with a repeater or ...
- 377
1
vote
1
answer
619
views
Using RS485 over CAT5e Foiled Twisted Pair (FTP)
I'm planning a system that has two sub systems that need to communicate with the PLC via RS485. The baud rates are 9600 and 19200 bps.
The cables are static (i.e. not moving) and placed inside of a ...
- 11
0
votes
0
answers
179
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USB Solution to Bit Bang RS485 at a high Baud Rate
I am searching for a solution to write a ~800 byte data stream at a 10K baud rate from a USB device.
This is going to connect to a piece of hardware that uses a RS485 connection which expects an ...
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