In serial communication data is transmitted as a sequence in time. Main advantage: much less wires needed. Main disadvantage: Higher bandwidth for the same throughput.

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1answer
37 views

Start Bit and Idle Data Line?

I am learning the Serial Communication without much EE background: The article says: The start bit is always indicated by an idle data line going from 1 to 0, while the stop bit(s) will ...
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0answers
54 views

Finding UART pins on a PCB header

I have a PCB with some headers exposed. I know for certain that some of those pins are UART connections (RX,TX, Ground). I'm hoping to find RS232 with TTL voltage levels but this is just an assumption....
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2answers
152 views

Indecipherable Data on Serial Monitor

I have ready made working electronic product. I am applying reverse engineering on it. The WiFi module is connected to micro-controller via UART( RX & TX). The android app sends command to WiFi ...
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3answers
55 views

Connect a micro switch to a PC serial port

How do I connect a micro switch to a PC's serial port and query whether it is open or closed? Which serial pin number(s) do I need to wire up?
0
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1answer
58 views

“Tagging” Data traveling over serial port?

If I'm reading data from multiple channels (UART) of a microprocessor, but I want it to be continuously read, I imagine the logical thing to do would be to cycle through the channels and output data, ...
0
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0answers
21 views

How to prevent Arduino Uno to change USB port [migrated]

I have an Arduino Uno connected through USB to my Ubuntu PC (one USB hub in between). I run a program that communicate through serial and use then the port ...
0
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0answers
23 views

How to communicate from Python to Arduino Softserial [migrated]

That is driving me nuts so I need your help. Master : PC with Ubuntu, a USB to serial converter (chipset CP2102), connected to Arduino Uno Pin 10, 11 and GND. The Arduino Uno is plugged in the same ...
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1answer
28 views

Battery Pack Configuration

I currently am using Li-FePO4 cells in the configuration below (picture): I'm researching how to build a passive cell balancer for this battery pack. Though I'm getting confused on some specs I'm ...
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1answer
21 views

BLE-serial module barebone (just need TX/RX and AT interrupt)

I want to add to my project, a BLE module; althought I am totally confused about which one should I get. I did check most of the common chip available; and I do not get exactly if I can just use the ...
0
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0answers
39 views

Particle Electron to RS232 Serial gibberish [migrated]

I've spent all day trying to monitor serial console output of a router. I'm using an "ebay" MAX3232 RS232 to TTL converter connecting only GND, TX and RX to the Electron. Trying to simply monitor the ...
3
votes
2answers
146 views

How does this PIC board achieve RS-232 communication without a line driver?

All the develooment boards I have seen yet with serial communication support usually have MAX232 line trasceiver. However, I have come across this Olimex PIC-LCD development board that does not have ...
0
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1answer
19 views

Sampling error in Lpc1769's Adc

I am trying to sample sin wave using Lpc1769's Adc. I am sampling signal using adc and send this data to pc using serial port (115200 baud rate). My sampling frequency is 1.5 kHz. When I sample 100 Hz ...
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1answer
82 views

Locating serial port

I'm not sure if this is the correct stack exchange site to post this, but here goes. I have this PCB: It's from this: https://www.vasco.com/images/DP270_Xpress_april11_tcm42-47389.pdf I'm trying ...
0
votes
1answer
47 views

Pyserial doesn't read entire line [closed]

I have an Arduino programmed to print a line containing eight values separated by commas every 10 milliseconds. Every line is terminated by a new line character. But when I try to read this data into ...
0
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0answers
61 views

ESP8266 - 01 blue led stuck on with nodeMCU firmware, LED control worked before

I'm using a ESP01 for my experiments. I installed a nodeMCU firmware on it using a RaspberryPI: And I connected a serial with it in baud = 9600. All ok. Then I use two leds for led blink: It's ...
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2answers
53 views

STM32 starts timing out receiving data UART after reading 1 byte

I am having trouble using the UART on the STM32F103 where it stops receiving data, while not setting any of the error flags. The UART device is an ESP8266 at 115,200 baud. I am sending it ...
0
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3answers
56 views

How to test USB to TTL cable is working [closed]

I bought this USB to TTL cable: https://www.amazon.co.uk/dp/B01DC0S13M Since it apparently uses the PL-2303HX chip, I downloaded the driver for Windows here: http://prolificusa.com/portfolio/pl2303hx-...
0
votes
1answer
29 views

Can I use SLIP on the same line as DMX?

I have a CAT 5 line with 12 DMX devices, each taking 4 channels. I also have a CAT 5 line with 8 microcontrollers (ex. Arduinos). These controllers need to send back data, and require error detection....
7
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0answers
182 views

How can a USB-RS232 converter manually assert its TX pin?

I honestly don't know if this is a Electronics Stackexchange or Stackoverflow question, but I'm posting here because this is related to an electronics project of mine that has been giving me pain for ...
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0answers
19 views

Why MATLAB do not always read from serial port? [migrated]

I'm doing a project where I need to read and write serial data between MATLAB and Arduino. But MATLAB do not always successfully read data. I set baudrate 9600 and my serial setup is like this: ...
0
votes
1answer
54 views

USB Full-Speed driver's effect on transfer speed

I am experiencing problems with USB communications which seems driver related. My setup involves an embedded device set up as a virtual com port (CDC/ACM) with which I communicate over USB. The ...
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2answers
33 views

Interfacing RFID reader module with PC

Sorry it may seem stupid but I think my confusion is drifting me away from the solution so I wanted to ask. I am trying to build a fixed RFID reader. But the project has some other complex work to be ...
0
votes
1answer
54 views

How to interface Si8902 with ATmega128rfa1?

The ATtmega128rfa1 works as master and Si8902 works as slave that is okay. But when a request is given Si8902 takes 8us to reply back with the ADC data. How can master wait for 8 us. How to ...
0
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0answers
44 views

Best and Simplest component for switching

I have a SIM 928 that has 4 pins for serial rx/tx. One set is for GSM and the other is GPS. On raspberry pi or micro controller, I only have one set. What is the best component to use to switch from ...
0
votes
1answer
125 views

Wrong signal on MISO line

I am trying to setup communication between my MCU and slave chip but here are the results from logic analyzer: I have basic knowledge of SPI protocol but as far as I know, data should be sampled at ...
0
votes
1answer
42 views

Connecting an auxiliary cable into three out of 9 serial pins

Please bear with me as I have no electrical engineering knowledge at all. I have a device with the following connection (and connecting cable): which as far as I understand is called an SRT ...
0
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3answers
77 views

Electronically, how to control this 5v arduino-style relay board from a PC serial port

I have the following relay board (pictured below), and to activate any of the relays, you simply connect one of the IN1-IN8 pins to ground. Easy. The current going between gnd and INx is negligible, ...
3
votes
2answers
44 views

Parallel input to serial output

I have been learning a bit about electronics. In particular I have been playing with the shift register 74HC595. Here I understand how bits are moved into the register serially, that is one bit at the ...
0
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1answer
42 views

FIFO ASF drivers and USART avr problem sending and recieve data via rs232 connection

I'm working to send frame of 8 bytes to Micro-controller Xmega128a1 (via RS485). The frame looks like this: {header1,header2,CMD,D1,D2,D3,D4,CRC} For example: <...
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2answers
53 views

Is an ADC with a serial interface slower than a parallel one, both having same sampling rates?

I am trying to interface an adc with an fpga, but I am running out of pins. I wanted to know if I use an ADC with a sampling rate same as the parallel one but with a serial interface , will I be ...
1
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1answer
64 views

Vacuum Fluorescent Display (VFD) serial connection ~ Debugging Questions

I am attempting to display information on a Futaba Vacuum Fluorescent Display (VFD) (apologies for the google-drive link to the datasheet. I lost the original and couldn't find it again). I'm ...
1
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1answer
85 views

Reverse-engineering asynchronous serial protocol for EcoSmart Tankless Water Heater

I am trying to reverse-engineer the remote control protocol for my EcoSmart Tankless Water Heater. Unfortunately, the remote control device is no longer available for purchase, and the manufacturer ...
0
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2answers
88 views

Will RS 485 to RS 232 converter change the half duplex mode to full duplex mode?

I am using an RS 485 serial connection through which I need to send S19 files for my boot loader project. Since it is a half duplex mode of connection, I need to toggle a dedicated pin before sending ...
0
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2answers
74 views

Can Putty be used to send serial data from the PC to the PIC? How?

I am looking for a simple program that can send data down the serial to the PIC. I have used Putty with USB-UART converter on my laptop. I have made the PIC->PC communiation work which is frankly a ...
0
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2answers
64 views

Can we send a file through Half Duplex connection?

I am working on a boot loader design for a kinetis controller. I am using this Terminal application ( https://sites.google.com/site/terminalbpp/ ) . I am able to send texts like, " Hello world" ...
6
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2answers
179 views

Is anything besides rx and tx actually used in rs232 nowadays?

Whenever I come across a PIC or even a FPGA project that is communicating over the serial port with a PC; only Rx, Tx and power are connected on the 9 pin connector and the other pins/signals are ...
0
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3answers
159 views

Confused about how microcontroller board and computer communicate

I recently got myself FRDM K64F board and got myself occupied with the following questions: Does the compiled hex code i send to my board has to go to the UART chip prior going into ...
0
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3answers
185 views

No communication with SIM900A using Arduino Uno

I am using Arduino Uno and trying to connect to a SIM900A GSM module using serial communication. I am not receiving anything from the module at all. The module powers on and has another LED flashing ...
0
votes
1answer
49 views

Raspberry Pi 2 to arduino RF Serial link with USB to Serial TTL Converter

This is my first question here. I want to have a communication channel which will use a 433 MHz RF TX-RX pair. I want to use a Raspberry Pi 2 as a transmitter and an Arduino Mega as a receiver. Is it ...
0
votes
1answer
46 views

If current consumption of serial flash SST26VF064B is 15mAq104MHZ then at 50MHZ it is 7.5?

I am Mohan working in Germany. For my data logger project i choose SST26VF064B serial flash. My data logger should consume lowest power possible. I see that SST26VF064B is consuming 15mA@104MHZ. In my ...
0
votes
1answer
45 views

Using Energia, how do I get around disableWatchDog() locking up my program?

Below is a short code chunk. The code locks up on the 'Serial.Begin(9600);' line. Can anybody tell me why? Also, can you tell me how to get around it? ...
1
vote
1answer
51 views

Large range input single level shifter

I have an application where I will be taking serial signals will need to level shift the signal to 3.3V. The input signal will be from 15 to 5V for a high input and I need them all shifted down to 3....
1
vote
3answers
434 views

Uart Full Duplex vs Half Duplex

When uC1 wants to talk to uC2 via uart, the Tx of uC1 is connected to Rx of uC2 and vice versa. Half Duplex states that only 1 uC can use the communication line at a time and Full Duplex states that ...
0
votes
4answers
139 views

reverse engineering a serial protocol with a scope

In lieu of a serial capture device are we able to look at the output of an rs-232 feed and correlate what we see on the scope with ASCII/hex representations (do certain voltages tend to correspond ...
1
vote
1answer
59 views

Does Interrupting a Microcontroller Data Receive with a Higher Priority Interrupt Cause Data Loss?

I would like to know what would happen if a Serial Terminal were to send a large amount of data to a PIC/AVR, for example over USART interrupt, which was then interrupted by a higher priority ...
0
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2answers
41 views

clock frequency confusion

I am using an atmega16 micro controller with a 12MHz external crystal oscillator. But I came to know that the internal clock frequency is 1MHz I need to calculate UBRR value for serial communication. ...
0
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1answer
68 views

10Mbs USB to serial communication

I want to transfer data from a full duplex serial device (TTL) to the PC. The data rate is 10Mbs , i am investigating potential solution. I can add a level converter like max232. I have 2 questions: ...
0
votes
1answer
43 views

High 4bit crash in atmega128 serial communication

I am trying to communication between atmega128 and serialCom(PC), but I get a pretty strange bug. When I send data 0 to 255 (char) from atmega128 to serialCom(PC) ,after sending 0x08, the high bit ...
4
votes
1answer
53 views

Help with multiple receiver channels and single storage architecture

I want to build a datalogger that has multiple receiver channels that run on serial communication protocol RS232 and then collect the information from the channels in a single storage that would be ...
0
votes
2answers
231 views

STM32F7 Discovery USB CDC using CubeMX [closed]

I've created a project in CubeMX for my F7 Discovery. I followed instructions form here. However, in my Device Manager on Windows nothing appears. When I used precompiled code from link I was assured ...