Questions tagged [serial]

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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Get individual satellite information from gps chip

I understand that if I plug into a chip like the MTK3339 through a serial connection, that I get the standard nmea positioning data. But is it possible to get the individual satellite data? In ...
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How to wire ATMega32U4 Hardware Serial to Arduino Mega2560?

I’m designing a custom, Arduino Mega2560 based, PCB for my project. One of its job is to run a bipolar stepper motor via a TMC driver amongst many other things. From what I know, the AccelStepper ...
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46 views

Write into external registers from FPGA

I want to initialise a register of an external component with a FPGA. The data is latched by the external component at every falling edge of the clock signal. You can see in the diagram that the SDATA ...
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Sending multiple data between the two NodeMCU using Serial communication

I'm working on communicating between the two NodeMCU basing on the serial communication protocol. I've used SoftwareSerial and ArduinoJson library for my program according to some sources on the ...
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How can I change the “USB Serial Port” name to something else? (or serialNumber for USB)

In our system, we want to plug more than 50 devices that have PIC1846j50, connected through USB serial COM port to a computer. We are experiencing that the computer does not recognize more than 44 PIC ...
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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 ...
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37 views

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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Attiny85 Serial Transfer INT from Teensy 4.1

Goal: Transfer incoming Analog Pot Data into Attiny85, convert to INT and send it out to Teensy 4.1 to read. I have programmed my ATTiny85 to handle a 7 Segment LED (partial code below). It takes the ...
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RS232/TTL converter with Arduino not recognized as serial device

My goal is a very basic one: I want to communicate from my microcontroller to my PC/phone via RS232. I bought a TTL/RS232 converter like this. And since my PC does not have a RS232 port I am using a ...
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1answer
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Transmitting data over FTDI usb-RS485

I am trying to using a USB-RS485 cable (which utilizes the FT323R). I have it configured to be all output, and to run in async bit bang mode. I am only able to see data on my scope if I call the set ...
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2answers
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RS485 implementation using MAX485 chip

I am using MAX485 chip for serial communication. But a weird behavior I found which I can not explain. Can any one help me in understanding why LED is ON in Receiver pin (RO) when I have not given any ...
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1answer
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MAX233 problem with receiving data

I need to make serial connection between regular PCs and a 3.3v TTL device, I using the Maxim 233 which has internal capacitors. I have the PCs incoming TD connected to R1_IN and RD T1_OUT. The ground ...
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60 views

Data Logic Levels Sent From Sensor Are Not Going All The Way Low

I'm having issues receiving data from a 3.3 volt logic level R503 Fingerprint Module that is sent via it's Tx pin using UART. The logic levels are converted to 5 volts using a bi-directional converter....
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What ESP32 UART Auto-Program Circuit Alternatives are there?

I am currently designing a board centered around the ESP32. I want to implement an auto-program circuit for convenience's sake, because I don't want to hold a boot button each time I want to program ...
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Problem with CH340C

Hi I made a board that contains an ESP32-WROVER and an USB to serial adapter ch340c but it's not visible when I connect it to the PC (Windows 10). I tried to install the ch340 driver and I even tried ...
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1answer
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STM32F4xx with CP2102N - CP2102N not recognized by the PC

The CP2102 was connected to the STM32 GPIO pins while USART1 was not configured (STM32 clean / not programmed). Is it possible that I destroyed my CP2102N via the GPIOs of the STM32 in that "...
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RS 485 communications not working, A, B both low

My question is: for RS485, does A or B (one of the two) have to be HIGH by default? If there are only 2 communication nodes in the network, should one of the nodes pull A or B (one of the two) HIGH by ...
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Serial comms not reaching 0 V

Connecting a DHT22 sensor to an ESP8266, I can't read the serial data sent back from the sensor. I'm almost sure this is a problem with the sensor communication not reaching 0 V as the software always ...
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Custom ATMEGA2560 with RS-232 Communication Problem

I made a custom PCB using ATMEGA2560 with 2 MAX3223 RS-232 ICs (because they were available to me) but only one Tx channel is working on both ICs and I can't receive anything on any of them. I tried ...
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my spi protocol in verilog is not working

I have written an spi protocol in verilog and it is showing error. here is the link from where i took the information for spi. https://www.nxp.com/files-static/training_pdf/26821_68HC08_SPI_WBT.pdf ...
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UART - Logic Analyser

So I've been working on getting UART access to the head unit in my car; I've got the schematics of the unit and found that TX3/RX3 on the Renesas SH7750 are presented externally - along with 3 "...
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1answer
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CH340G and ESP8266-12e. Doesn't work together

I've done a USB to UART programmer board. I use Arduino IDE (macOSX)to upload a sketch. If I short RX and TX on a programmer board it works as it should. All I enter in the Serial Monitor it shows me ...
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Weird problem with usb2422 and CP2108

I've have a system consisting of a Raspberry Pi Zero W, a usb2422 USB-hub, a CP2108 Uart-to-USB converter as well as another USB device (lets call it device 2, it doesn't matter which one I plug in). ...
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Serial Communication Arduino to NodeMcu

I'm looking to take inputs via keyboard by Arduino mega through USB cable (Serial monitor Inputs), and send them to nodemcu through serial communication (TX - RX ) so I can send it to a server (from ...
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52 views

UART permissible cable length

I am communicating between two esp32's. Can the UART at a baudrate of 512000, work fine over a distance of 1 metre? . The data will be sent at 10ms intervals. Wires are standard 24 awg.
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MDB Protocol - Communication between a PC and a payment terminal

I'm working on a project where I need to create a communication channel between a standard PC (running Windows) and a payment terminal (a NFC credit card reader, an Ingenico iUC 180B). I'm a junior ...
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1answer
54 views

How to communicate over long distances (60 m) using serial communication from multiple serial devices connected to my PC

Previous post As per my previous post which involved determining which type of serial connection is appropriate i.e. RS232, or USB. This was clearly RS232. As a follow on post to that question. I have ...
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1answer
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Is it better to use USB A or USB B or RS232 to communicate over long distances? [duplicate]

Similar post As per the previous post (which was 5 years ago), I have a device that has three forms of serial communication. One is an RS232, the other is USB A and finally a USB B. So I have three ...
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CAN Frame Malforming on Oscilloscope

I have a working 500kbps CAN bus between an Arduino Uno and a RaspberryPi. Both are connected to MCP2515/TJA1050 boards from Amazon and communicating over SPI. The RaspberryPi dumps the CAN data via ...
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54 views

Opto-isolated RS232 signal capture

I have a problem in which I need to capture (spy on) an RS232 signal through an opto-isolator. This isolator needs to be high speed since the RS232 signal can reach up to 115200 baud. The main problem ...
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Serial Communications delay

Hopefully this is more of an electrical engineering question than a MATLAB question, but I don't understand a system response I'm getting. I recently got 2 Arduino Due's and configured 1 in MATLAB ...
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2answers
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How to connect to service pads without soldering

I am trying to connect to service pads like the these (the golden, round connectors) my soldering skills are good enough to solder some wire onto these, but I have to check a lot of different pads ...
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UART2 in esp32 won't work after booting up

I have been trying to establish communication between DOIT ESP32-devkit V1 and arduino uno using the uart. I have used the software serial in the arduino uno and hardware serial in the esp32. The ...
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38 views

Data boundries in SPI serial interface

I am trying to understand the SPI serial interface between a Master MCU and a (Single) Slave ADC. Do we have 8-bits or 16-bits data word communication in SPI? Or is it un-bounded and I can send any ...
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1answer
28 views

How to connect a micro controller to a CDC device?

I have a device that exposes a USB port recognized by a PC as a virtual com port. I need to connect a micro controller to this device through its USB port. How should I do? I'm looking for a kind of ...
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USB to Serial (RS-232) cable not displaying data on Arduino serial monitor

My previous post (Pictures from the previous post as well) So far all of the answers and comments yielded no solution to my problem. This post offers a different method to communicate serially with ...
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52 views

Slow down rs232, 9600 (locked) to 300 for vintage printer

I have an old GE terminal (late 70s) that I'm trying to use and an old serial printer. The RS-232 port is locked at 9600 baud but my TI Silent 700 (late 70s) is 300 baud max. I've tried to Google ...
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57 views

Setting up UART with STM32L4RGTx

The prompt here is to debug the issue with UART setup on the STM32 chipset. I've followed a couple of online blogs to understand and setup the UART interface. I want to transmit (only) a dataframe (...
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2answers
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TF-Mini S lidar not sending any serial data

I have a TF-Mini S Lidar. I have hooked it up to my arduino like so: (Above image from learn.sparkfun.com) And have uploaded this code to the arduino board: ...
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Help identifying serial communication wiring

I am wanting to view serial data output from a device on a O-scope. This is a serial measurement board from an industrial robot. I have managed this in the past with other devices, but I am having no ...
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1answer
63 views

Serial Port communication to PC troubleshooting

GOAL The goal is to bridge a serial port measurement device into a USB PL2303 device. Various degrees of success were observed and I hope the community can point me in the right direction in terms of ...
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How to receive a startup hex string during a debug session?

This is my setup: I have a 'smart display' connected to the serial interface of a PCB with a PIC microcontroller. The PIC powers the smart display. This smart display uses a boot mechanism. When the ...
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2answers
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What are data available and data required in SSI/SPI

I'm trying to understand SSP/SPI but I'm stuck on the concept of data available and data required. Here's how it explains it in the textbook (Valvano's Introduction to ARM Microcontroller): The key ...
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Why isn't my PC recognizing my serial stream from my Arduino Uno?

I installed the instrument control package to Octave and have the Arduino IDE sending a single character to the computer every 100 ms. The device is transmitting on COM3 but the software still doesn't ...
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1answer
73 views

How to debug serial communication with RealTerm?

I am trying to debug an LCD device with an RS232 UART interface. I am using RealTerm on a Windows 10 machine. The UART interface works properly. I have checked the sending device, using an ...
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64 views

Sending serial data over analog TV coaxial cable (RF-band)

TL;DR: I would like to transfer digital serial data over an existing analog TV cable. How do I do that?   Full Question: In order to transfer some data to a device's control lines remotely, I'm ...
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2answers
63 views

Bi-Directional RS-232 / RS-485 translator using MAX3162 IC [closed]

I'm trying to communicate with an I2C bus using the Serial Card in my PC (NI PCI485/8). I've created a circuit using the MAX3162 to translate from RS485 to RS232. Then I use the MAX3232 as a level ...
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2answers
120 views

Sending large ammount of data with USB

I'm currently facing a big problem. I've an MCU (STM32L4) connected to an SD card (SDIO) which stores tons of data (5Gb) from a microphone. I need to send this data as fast as possible from SD card to ...
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3answers
138 views

How would you combine DC power, bi-directional serial data, and an RF signal on a single 50-Ohm coax feedline?

I would like to power a remote device and communicate with it over some serial protocol on the far-end of a 50-Ohm coax feedline (RS232, i2c, SPI, etc), while at the same time sending/receiving an RF ...
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Serial commands not being flushed from Raspberry to Arduino

I have an Arduino Mega controlling a matrix of 4x4 solenoids via the GPIOs opening/closing mosfet gates used as switches. I'm trying to send commands via Serial from a Raspberry Pi 4 to the Arduino ...

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