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Questions tagged [communication]

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

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Why does SIM800L respond to AT+CIPSEND with “+CME ERROR: operation not allowed” when the IP address and the TCP connection has been established?

I am working with a team to send data from Raspberry Pi over 2G network to a server using a GSM module called “SIM800L EBV”. We encountered an AT+CIPSEND error that has only occurred in Zambia, Africa ...
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0answers
33 views

Performance affected by twisting two data transferring cables? [on hold]

I have two data cables. One is for my computer and other is for a SIP phone. If these two wires are twisted together, will it affect the data transfer?
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43 views

Problem communicating a gas meter through 3 pin RS232

I have recently bought a gas meter (AMBII, Sensors Europe) and have trouble communicating with it through 3-pin RS232. The spec. of this sensor may be defined a long time ago, probably in 1990's. ...
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1answer
34 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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1answer
29 views

What are cost-effective and ways of providing global communication between two devices besides internet and SMS?

I am currently in the process of building a system which allows vehicles to send information back and forth with an Arduino. The main problem I am facing right now, is that the current implementation ...
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39 views

STM32 UART DMA communication without size of data

Hello i have problem with uart communication on my stm401re/446re board. I would like to manage communication on 2 or 3 uart ports, but i dont know the exact incoming data size. I have configurated ...
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16 views

Electronics communication NF Question (noise figure or ratio problem)

I am taking E-Comm course and I am in my last semester. I have a question that I couldn't solve. The question is: The problem is the loss line length is 75m and has 4db loss per meter. 75*4=300db ...
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1answer
63 views

How does Wi-Fi deal with multiple frames received at once?

Right now I'm trying to establish a network of 30+ transceivers with NRF24L01 modules - one of them acting as central. However there are big problems, whenever two or more nodes try to send data to ...
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27 views

Is there a standard communication format for a document scanning head?

If I take a document scanner and the bar scanning head from it, how would I g about communicating with it and would something with the power of an Arduino have the power to interface with it? I have ...
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33 views

Channel capacity

What is the maximum capacity of a perfectly noiseless channel whose bandwidth is 120 Hz, in which the values of the data transmitted may be indicated by any one of the 10 different amplitudes? (I am ...
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73 views

Honeywell I2C RH Sensor SDA line experiencing fluctuation between Vdd and Vdd/2

I had a problem when implementing I2C communication between NXP Kinetis K50 micro-controller and Honeywell Humidlcon I2C RH sensor. The RH sensor doesn't acknowledge when receiving the default address ...
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0answers
19 views

ESP32 WROVER- How do you force a SEND FAIL

Good day all, How do I force the ESP32-WROVER module to display a SEND FAIL after not receiving a message string after the >? The problem I am having is that in my application I don't want to close ...
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22 views

GSM868 UART interface

I have doubt regarding the diode direction.How the UART communication will happen between DTE TX ---> GSM RX? Kindly explain.
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1answer
36 views

STM32CubeMX/STM32L0 UART Transmit unknown symbols

I am trying to connect UART communication with STM32L053C8-Discovery. But the problem is on terminal I get unknown symbols. My Setup on CubeMX ...
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0answers
15 views

ENC28J60 rejects unicast packets - unicast filter is on, MAC is set, and addresses match

I'm programming an ENC28J60 driver at the moment, and have encountered something odd when attempting to receive packets. More specifically, unicast packets. According to the datasheet, when the ...
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1answer
33 views

Antenna polarization and antenna directivity are the same?

I'm working on an RFID project, and looking for information about the antennas that I have to use, I have the following doubt: Antenna polarization and antenna directiivity are the same? Thanks!
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1answer
59 views

Does this wiring pattern for a DB9 cable exist as a standard cable?

I have a scientific instrument that uses a DB9 cable to connect to the standard RS232 port on a computer for communication. I've deconstructed one of the cables as I needed to make another one but I ...
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0answers
18 views

Rate matching in LTE or NB-IOT

I understand well the use and function and implementation of Viterbi decoder, but what is the function of rate matching block ?
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1answer
70 views

Current modulator for laser driver and analog audio signal modulation

I would like to build a proper laser driver and use an audio output to modulate the laser output. At the moment, I connected the audio output instead of the battery in a laser pointer. It works, but ...
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2answers
91 views

How does this fire alarm system transmit data on two-wire?

In the fire detection industry, analogue addressable systems use control panels and detectors (and devices such as interfaces) which communicate with each other by means of a protocol. What protocol ...
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2answers
360 views

Communicating between 2 different microcontrollers

My Arduino runs at 16MHz clock speed; another microcontroller runs at clock speed of 13MHz. If I send digital output directly from an output pin of the former to input pin of the latter, there will be ...
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1answer
43 views

Arduino RS485 Communication

Working on a RS485 IC circuit. It is a point to point communication between two devices connected to each other via MAX485 IC and CAT6 Cable. At 1 or 2 m length of cable, the data transfer seems ...
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2answers
48 views

What is image and video signal ?

Signal is something that carries information. Usually, something is a pattern of variations of physical quantity that can be manipulated, stored, or transmitted by a physical processes. I am wondering ...
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1answer
29 views

How can Erlang C values be greater than one?

Here is an Erlang C plot I did myself. The x-axis represents the total traffic while the y-axis represents the probability. Each line represents a different total number of channels. As you can see, ...
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1answer
933 views

Why do we need bit scrambling when using 8b/10b?

I want to ask the opposite of this question. Here are the purpose of the bit scramblers: Encrypt, but LFSR (and other used) bit-scramblers are breakable. Clock recovery, but it is done by the 8b/ ...
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1answer
45 views

Why are Erlang B and Erlang C formulas different?

Erlang B determines the probability that a call is blocked and is defined as: $$Pr[blocking]= {{A^C \over C!} \over {\sum_{k = 0}^{C} {A^k \over k!}}}$$ while Erlang C determines the probability ...
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1answer
28 views

utilize a single channel to transmit data generated from 16 users (using mux)

I have found this question in a book and find it confusing. The question is, For a communication system, it is required to utilize a single channel to transmit the data generated from 16 users. ...
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39 views

Symbol rate of the application

so I have this problem: "Data modem transfers information at the rate 56 kbps using 128 signalling states. What is the symbol rate of the application." I thought it is as simple as this: M = 128 = ...
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1answer
16 views

dsb_sc of sin wave

Can we take the dsb_sc(Double side band suppressed carrier)of a sinusoidal signal I know that it exists for cosine but for sine I can't find anything on the internet
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1answer
87 views

Analog beamforming vs digital beamforming

I am reading some research articles on wireless communication where they talk about beamforming techniques and their differences in Multiple antenna Tx-Rx systems (MIMO). It says analog beamforming ...
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4answers
963 views

Is this communication I²C?

I need to decode communication between two devices, but I have no information about these devices. All I know is that four wires are needed (GND, VCC and two wires of communication). I suspect that it ...
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0answers
35 views

How to avoid clash of multiple RF modules

I am working on a project which requires multiple RF working together (around 500). This will be one-way communication from TX -> RX i am using encoder/decoder(addressing) HT640 & HT648 but I am ...
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0answers
39 views

Power of random signal in AM

I'm trying to wrap my head around this problem : I must admit I'm pretty much blocked from the start, at a). I don't understand how I could derive the power of \$s_{AM}\$ given the frequency of the ...
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22 views

Can interference cancellation be applied to half-duplex devices?

I am aware that interference cancellation such as successive interference cancellation is applied in the context of full-duplex devices. However, I am not aware if it can be applied for half duplex ...
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1answer
89 views

Communication between a Computer and Microcomputers

I am currently working on a project that require me to communicate between several Raspberry Pi's and a computer. I'll display data that sent by Raspberry Pi on that computer. Since I am using ...
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2answers
57 views

PLC as gateway with TCP/IP communication stack?

I'm having issues designing an architecture for communication in a vehicle. Currently a PC is connected through a switch to a series of ECUS, each one with a TCP2CAN converter. The PC has to be ...
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3answers
149 views

Methods for confirming on both sides that a signal was received in one direction

Say there are two devices (A & B) that talk to each other (full duplex). For the sake of this example, let's say the medium is RF (wireless). If device A sends a message to device B, what ...
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1answer
51 views

Which material is considered non linear communication channel?

Communication channels as far I have seen(Air and conductors) are modeled as Linear systems. Was wondering if there are mediums/materials that make the channel nonlinear? For example, if channel is ...
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1answer
83 views

PC to Rasberry Pi Serial Communication

Im trying to communicate to my pc using my raspberry pi using a software called Docklight. I'm using a serial cable (that i ripped apart) and my breadboard as shown below. Now, you can also see I ...
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1answer
108 views

Fast, cheap, wireless data transmission with Raspberry Pi [closed]

I need some advice on a project. I want to wirelessly transmit packets of data from a Raspberry Pi to several microcontrollers (Arduino or other). The frequency must be at least 15 packets/s per ...
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7answers
5k views

Is it possible to send multiple data bits on a single wire at once?

Is there an existing protocol or modulation method where multiple data bits are sent over a single wire at once or maybe an additional ground line (like serial communication)? I know there are ...
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3answers
139 views

Why do we use a DB9 connector for serial com?

We only use 4 wires (pwr, common, and two data), so why does rs232 use such a big connector?
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0answers
43 views

What is the difference between Antenna port and Physical Antenna in LTE?

I have just started working on the 5G NR physical layer and I have difficulty understanding the concept of Antenna Port at the downlink. In release 10 there supposedly 15-22 antenna ports for CSIRS (...
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0answers
97 views

I don't understand the difference in data received between my C++ app, and XCTU/Realterm

I am new to coding in C++, new to wireless communication, and am self taught, so if you notice any mistakes not related to the problem please point them out as well! I have two XBEE series 1 attached ...
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4answers
151 views

Fiber-optic transceiver ICs for applications other than fiber-optic Ethernet? [closed]

When we talk about fiber-optic transmission, we almost always talk about copper to fiber-optic Ethernet conversion using fiber-optic transceivers. But since fiber-optic communication is just ...
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2answers
92 views

Cheap Low Power Signal Transmission To Smartphone

For my university project I'm making a certain sensor which has to (one-way) communicate with a smartphone. The sensor needs to be as cheap/simple as possible (aiming at +- €0,50 in total) and only ...
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1answer
33 views

Method to find Correlation for a random variable and thereby power spectral density of random signal

I'm trying really hard to understand the segment of text from a standard communication book ( Modern digital and analog communications by B P Lathi). We are trying to find the power spectral density ...
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1answer
149 views

How to make communication between microcontrollers

I want to make a project where it is necessary to communicate between several microcontrollers in the fastest way possible. For that matter I have 10 micro-controllers whose names will be 1 ... 10: ...
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0answers
120 views

SPI with differential signaling

Standard SPI uses single-ended signals. Is it possible that a communication uses SPI protocol but the signals are physically LVDS?
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1answer
78 views

RS485 to RS232 conversion?

I need to connect a sensor that uses a RS485 transmission to RS232 or something I can read through the com ports on my data logger. I can't use usb ports or virtual com ports due to the program I am ...