Questions tagged [communication]

Exchange of information between devices. Communication can be wired or wireless.

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Why are peripherals called upstream-facing ports?

I was surprised when I noted this naming in USB-C Wikipedia: Devices may be hosts (with a downstream-facing port, DFP) or peripherals (with an upstream-facing port, UFP). The oil and gas industry ...
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1answer
42 views

How does I2C Clock Stretching occur on a hardware level

I was reading about the I2C Clock stretching. I understood like, in cases when the slave is requires some time to manage the received data from the master, it slows down the communication speed by ...
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Transferring large amount of data between MCUs running Linux and FreeRTOS

I have two MCUs: one running embedded Linux and the other FreeRTOS and I want to be able to send variable-sized payloads between them and large amounts of data (probably upto 5K bytes or so). Ideally, ...
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What is the correct block diagram of satellite communication system and can you explain in brief about the correct one? [closed]

I could not find explanations in textbook. They show only diagram. I know basics of data communication so I can understand what might be going there. I want a concise explanations of exactly what is ...
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29 views

How does this condition of threshold voltage come into picture in the given context?

I have been studying communication systems from a particular set of notes which I found online. The link to the notes is attached in references. In the page 56 of the PDF of notes, a statement with an ...
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2.8V UART to 3.3V and 5V MCU automatically

I'm designing a PCB of SIM800C Module. Just to improve myself and it is my first project so I'm a noob sorry.. I want GSM module to communicate(from RX,TX pins) with STM32, Raspberry, Arduino. But the ...
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1answer
66 views

Why does SAE J1939 Commanded Address requires a delay when sending multiple package message?

I wonder why the command Commanded Address from SAE J1939-21 protocol, requries a delay between 50-200ms for every multiple package message for the transmitter. Why? Does the microcontroller unit not ...
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68 views

What to do with unused pins on a 1000BaseT RJMAG jack

Trying to figure out what to do with the unused wires heading into the magnetics on an RJMG2330A1610ER Ethernet/USB jack. Due to the craziness in manufacturing in the world I am forced to find a ...
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51 views

HX711 loadcell amplifier with builtin mcu communication problem

I bought the following version of HX711 module. Connection to Arduino VCC -> 5V GND -> GND SCK/TX -> GPIO 6 DT/RX -> GPIO 7 However, it doesn't work. I have tried different libraries and ...
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21 views

How to find priori information in Cramer Rao Lower Bound when the pdf of the parameter is unkown

In order to compute a Bayesian Cramer Rao Lower bound, we need to find the prior information of a random parameter "theta" which is a complex scalar parameter. The pdf of "theta" ...
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2answers
281 views

Simplex UART echo implementation on ATtiny

I'm currently trying to implement a simple UART echo application on the ATtiny85, with no additional pins other than RX/TX (no autoflow control). I'm using the Universal Serial Interface of the ...
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1answer
214 views

How to convert from 2 data line full duplex to 1 data line half duplex?

I'm trying to design a circuit that can convert from a two wire full duplex (think SPI), with one transmit line and one receive line, to a one wire half duplex (think i2c), with bidirectional ...
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Two-way(bilateral) signal transmission in telephone lines [duplicate]

Telephone lines have two wires. Probably one of the wires is ground and the other is signal. When I talk on the phone. (For example, I called Mr. John) My voice is probably transmitted as a voltage ...
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1answer
57 views

MCP2525 not initialized for CAN bus implementation

https://github.com/coryjfowler/MCP_CAN_lib/blob/master/examples/CAN_loopback/CAN_loopback.ino I'm using this library to implement CAN bus and I am using the loopback mode example using a single ...
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1answer
77 views

What value series resistor should I use for USB data lines when two ICs require different impedance values?

I'm using a USB hub (TUSB2036VFR) that communicates with an ATMEGA8U2 and an FTDI chip. The incoming USB signal comes through an isolated USB communications chip ADUM3160BRWZ. The TUSB2036VFR requires ...
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2answers
597 views

VHDL: Receiving Data from Terminal to FPGA using TTL

(I posted same question in stackoverflow but didn't get right answer) I'm newbie in VHDL. So today, after UART Tx, I tried to read Datas that coming from Realterm terminal. I only wrote Rx codes to ...
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2answers
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Modbus RTU using SoftwareSerial

Im trying to control a temperature controller using Arduino MEGA over SoftwareSerial. Im using Modbus-Master-Slave-for-Arduino library and I tried to test using example code below. It gives only <...
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2answers
409 views

SPI modes of data transfer

I am learning SPI protocol in serial communications now. I got stuck with the clock phase and polarity controls concept. Why there are 4 modes available other than a single universal transfer mode. ...
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1answer
263 views

What is the difference between residual phase noise and absolute phase noise?

Studying the characteristics of an oscillator with a phase noise analyzer, but I don't quite understand the difference between absolute and residual noise. Any help would be greatly appreciated
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Consider Noise in Link Budgets

I want to verify the range of my RF-system for a university project. I use two transceivers (Datasheet) and one power amplifier on the transmit side (Datasheet). The target range is 120 km over which ...
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1answer
118 views

FPGA-based SSD host controller without transceivers

Problem: I am looking for options to design a host controller for SSD (SATA or nVME) using transceiver-less FPGA. Question: What are the current state-of-the-art practices of doing such designs? My ...
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6answers
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Implement send-only (one-way) Ethernet cable

I want to build a unidirectional comminucation. In transportation layer of this device, it needs a one-way media to send data from side A to side B. All commercial products use SFP. I tested some SFP ...
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2answers
60 views

SCADA communication protocol

I am a software engineer by trait and have very little knowledge of communication protocols inside surrounding PLC's. Not even sure I have a PLC at this point. I have bought a battery, a quiet big ...
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0answers
52 views

Transform a UART into a USART with twice as many channels?

I need to provide reliably DAT and CLK lines to a component from a UART - the 16C554. Is it possible to write twice as many bits in an adjacent channel of the UART, alternating between 0 and 1, and ...
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20 views

Profinet Configuration

I'm trying to communicate a PC with SIEMENS s7 1200 cpu 1214 dc/dc/dc via PROFINET. I have not found any source yet. This answer seems useful but I do not know how to create a GSD file. It is written ...
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1answer
61 views

A possible shot in the dark - Seaward HAL-104 Tester experience?

This post might be a shot in the dark, but has anyone here had any experience with the Seaward HAL-104 tester and its remote command protocol functionality? Or perhaps know someone who has? There is ...
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6answers
8k views

Can I use I2C over 2m cables?

In my current project, I need to communicate between a microcontroller and some sensors over I2C. One of them is a temperature sensor, it needs to be placed at approximatively 2 meters far from the ...
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1answer
43 views

Profinet connection between PC and PLC S7 1200

I am trying to create a communication between PC and S7 1200 PLC via Profinet. I have researched many web sites and I could not find any information for me. According to the research, I should use GSD ...
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2answers
144 views

RS-485 Connecting 100 devices - Avoid GND Loop

I'm new to community and it's my first question, so please forgive me for mistakes I could do referring to adding pictures and descriptions. I plan to use 100 devices and connect them via RS-485 in ...
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1answer
81 views

RS485 Reverse Engineering

I'm reversing a RS485 comunication. I have purchased a logical analyzer for reversing and sniffing the data packets. But i have a problem, don't knowing the exactly comunication parameters i can't &...
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5answers
137 views

What is 'Symbol' in communication? [duplicate]

I am just asking about the meaning of "Symbol" in communication. I know that I should search about it before asking, and that's what I did, but the issue is that I encountered many terms ...
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2answers
823 views

USB to USB data transfer using microcontroller [closed]

Is that possible that we can communicate two USBs,I mean data transfer between two USB without PC ? How we can transfer data without PC between two USBs ?So please anybody can give me some idea how ...
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6answers
4k views

Could data transmission power consumption be lessened by transmitting more zeroes?

According to the IEA 250 TWh of power was consumed in 2019 due to data transmission globally, about 1% of worldwide electrical power use. I would like to pose a very simple question regarding power ...
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1answer
48 views

How to interface one mini-computer (such as Raspberry Pi 4) to multiple micro-controllers (such as Raspberry Pi Pico)?

I am developing a aeroponics type system which has multiple stacks. Each stack has multiple trays which house the growing plants. I am going to use the Pi 4 as a main control station from where i can ...
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1answer
252 views

STM32f103 NRF24L01 Communication Problem

I am trying to apply communication between two stm32f103c8t6 with NRF24L01 modules. And using uart with usb to ttl module to reach putty terminal. I am using KEIL and for generating code CUBEMX. Here ...
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5answers
4k views

How to communicate faster than the system clock

I was reading about the new (ish) Thunderbolt 3 today, and was very impressed by the specced speed of 40Gbps. Then I looked at Intel's latest i9 processor speed... about 4.2GHz max. How can a system ...
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1answer
300 views

STM32 BLE profiles - multiple sensors active ST BLE Sensor App

I have done the MOOC for the stm32wb55 BLE profiles and now I am trying to introduce more BLE characteristics. I managed to make the sensors work and to transmit them to the ST BLE Sensor app. However ...
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1answer
265 views

MC1496 can be used as a DSB SC and AM IC, but their circuits on the datasheet are the exact same. What is the difference between the two?

I am looking at the MC1496 IC datasheet provided by ON here. Figures 1 and 3 show that you can make an AM or DSB-SC signal using this circuit. However, the two test circuits listed on the datasheet ...
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1answer
175 views

SC18IM700 operation (RS485 to UART to I2C)

I need to create a circuit to talk to a piece of equipment using the I2C bus. I'm on a PC that has an NI serial card with RS485 ports(I'm not sure of the model number off the top of my head). I ...
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2answers
2k views

What is the use Data Strobing

Randomly searching for something else I found out about this strange communications scheme called data strobing. It seems that instead of sending a data and clock line, you send a data and strobe ...
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2answers
53 views

RS485 different voltages

Please note that I'm a beginner in electronic... Hello, I've got myself some RS485 modules to test with Arduino and i managed to get them working in half-duplex. From this post I've seen that for ...
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2answers
622 views

Noise resilient, hot-pluggable communication bus over long cables?

I'm working on a setup, where we need communication between a master device and several slave microcontrollers distributed out in different boxes connected by "long" cat5e cables (3-10 meters) The ...
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3answers
167 views

How can you transmit 10 Gbit/s using a 250 MHz carrier frequency (Cat 6 Ethernet < 55m)?

I refer to this cable because they also include a test certificate (3rd icon down on left). The cable is tested to 236.5 MHz (250 MHz nominal). Yet it's a Cat 6 cable capable of 10 Gbit/s (if length &...
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102 views

Is there a straightforward way to transfer data from a BLE module to my PC?

I'm trying to send some sensor readings from a BLE module (RN4871) to my Windows 10 laptop. I have no problem sending them to my phone and receiving them on a serial Bluetooth terminal. I also have ...
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4answers
1k views

Communication between two microcontrollers using SPI, I2C, and some sort of buffer?

I have two microcontrollers that are both pretty maxed out on their capabilities. MC1 needs to make a 14bit measurement result available for MC2. MC1 can communicate with SPI, and MC2 can communicate ...
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1answer
951 views

Bandwidth-Noise-SNR relationship

Let’s say we have the noise figure F of a system of devices. We also have the bandwidth improvement coefficient ( as defined by my teacher ) $$BI=10log(\frac{B_{in}}{B_{out}})$$ where B1 is the ...
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0answers
13 views

Half duplex bus switching

I would like to design a unit that communicates on CAN bus. The unit will daisy chain the bus using two connectors. I would like to be able to disconnect the second connector, disrupting the daisy ...
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2answers
100 views

How Mobile Phone Call Works [closed]

This may be a noob question, but I'm having a hard time and confusion finding the answer. How does a mobile phone call work in the mobile phone itself so that analog data (voice) is transmitted out of ...
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1answer
155 views

How do I stop signal looping with I/O port in this communication system

I am still a student. When I am designing communication system I am facing this problem: As shown in the figure I need to communicate with Master and Slave. But Master and Slave have single I/O port ...
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6answers
180 views

Simplest way to transmit digital data?

I have an interesting problem that's been wrecking my brain and would like some help with it. Basically what I have is a voltage readout box that has a few voltage displays on it. I would like to ...

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