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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Teensy 4.0 how to get a serial connection to pc (theoretical)

So, as the title says I'm wondering how I can get a serial connection to the pc via usb. I don't have any code written yet. I want to understand it in theory. I have a Teensy 4.0 development board. I ...
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How to use a TTE A310 minitel with RPi?

I don't know if it's the good place to aks but I have now a Matra TTE A310 which is a minitel, and I'd like to make it communicate with a Raspberry Pi or Arduino. I tried to make the connections with ...
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60 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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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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35 views

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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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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1answer
126 views

PIC18F26J50: how to use printf in C18

I'm trying to use the printf family of functions in C18 for a PIC18F26J50. In my system, the output should go through the UART and show up in RealTerm. Here is my ...
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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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How do I hook up an LED across the tx pin on my Atmega328?

I've built a standalone Arduino and upload sketches via this method From Arduino to a Microcontroller on a Breadboard. I would like to hook up an LED across TX like on the Arduino board, so I simply ...
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1answer
53 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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61 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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51 views

Bi-Directional RS-232 / RS-485 translator using MAX3162 IC

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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103 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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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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353 views

Can you send RS232 messages to yourself in PuTTY?

Say you use PuTTY serial mode and a USB to RS232 cable. Can you send messages to yourself if you wire the TX of the cable back to its RX, not haphazardly, there's probably a bit more set up detail. I'...
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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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153 views

How to Update firmware of microcontroller using DALI lines of a DALI slave module?

I have developed a DALI slave module with PIC 16F18326 microcontroller. Now, I want to make a Bootloader for this PIC. But the problem is, I don't have a serial communication or USB connection with ...
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1answer
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Different behaviour of FTDI231XS on two PCBs with same circuit

I have designed two PCBs, both using a FTDI231XS USB to serial chip to program an ESP32. Both boards have the same circuit design to control the FTDI231XS chip. One board was hand soldered (board A); ...
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1answer
42 views

How to handle these inverted duplexed serial protocol in Arduino?

I have a device that communicates with an inverted duplexed serial protocol like the following: I need to communicate with this device with Arduino. I tried to send simply UART serial text to ...
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3answers
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MSP430 serial communication failing in cold weather

I have a product using the MSP430 microprocessor, which has been selling for a couple years now. One of the MSP430's jobs is to communicate over async serial to a low-power radio. With the onset of ...
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38 views

Continuous servo "misbehaving' with arduino uno

I've recently got a TowerPro MG996R 360 degrees Robotic servo and after many tries I still can't get it to work properly. Using the Arduino's Servo library I wrote a simple program that writes a value ...
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1answer
31 views

USB-3 Type A Connector Current Drain

I have a USB 3 Type A (i.e. 9pin connector) connector on my PC and connected to a USB 3 Type A connector on my PCB with a USB 3.0 Cable. This USB3 A Type connector on my PCB is connected to FT232H ...
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1answer
56 views

What kind of serial cable do I need? (TTL vs RS232)

So I have a headless NAS that I'm trying to connect to via a serial console so I can install a different OS. It has a 3.5mm jack on the back I/O labeled COM1. I had ...
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2answers
54 views

Addressable ICs similar to WS2811 for monochrome LED [closed]

For my home decoration, i want to individually address the led strings . Since one string is of a single color, i need an ic with serial communication similar to WS2811 ic but monochrome to control ...
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1answer
262 views

synchronous serial interface in verilog

i have a ADC (ADS1672 datasheet) (20MHz) with serial interface and xilinx spartan 3 XC3S400-208 (50MHz) in it's datasheet to data retrieval comes this: for that i implemented this code: inputs and ...
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Chip shorting to ground when connecting the grounds

I have a pcb that converts USB to RS232, it is using a CH340G and a MAX2323. The output when not connected works as expected. I try to connect it to a separate device that has its own power supply. ...
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3answers
2k views

Explain why the NodeMCU auto-program circuit would be useful

I'm looking at the NodeMCU "auto-program" circuit but could not understand why it is there at all. From my point of view, this circuit enables open-collector outputs, but makes programming dependent ...
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1answer
141 views

ISELED Driver Communication protocol

This is my ISELED Driver Datasheet INLC10AQ & my Microcontroller datasheet S32K142 - 64 pin Microcontroller I have a NXP Microcontroller connected to the above LED Driver. I need to figure of the ...
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Multidrop bus protocol on the BeagleBone Black PRU

I am truying to implement the MDB protocol on the BeagleBone Black, the problem is : the protocol requires a 9 bit data via UART (9th bit used to differentiate if the sent/received data frame is an ...
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2answers
2k views

Add serial interface to ST-link clone

I recently started studying STM32 microcontrollers (BluePill STM32F103 dev board + ST-link V2 clone). I was wondering if it is possible to add serial communication to ST-Link clone? From what I ...
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1answer
31 views

Low Power SPI Module communication between Microcontrollers

I have 2 microcontrollers - one is S32K118 and other is S32K142. Both are 64 pins. S32K1xx datasheet I need communication between the Microcontrollers in SPI Configuration. Suppose the microcontroller ...
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1answer
44 views

Response time of RTS and DTS pins of the chip FT232RL (USB to Serial)

I'm controlling the values ("High" or "Low") of RTS and DTR pins in FT232RL using python package serial. My question is what's the maximum time between executing the command ser....
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Could Cat5e be used for RS485 [duplicate]

I'm working on a project that will be using RS485 to communicate between a bunch of modules and a master controller. Low baud rate, 9600, but a decent distance, like a couple of hundred feet. I'm ...
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2answers
184 views

Using QSFP28 Module at Lower Lane Rate

I have an application that requires optical transmission of 4x16 Gbps SERDES lanes over fiber. A QSFP28 module for 100G ethernet seems like a great commercial solution--it can take the four lanes and ...
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6answers
110 views

how bits are still synchronized in asynchronous transmission?

I was reading a textbook which syas: In asynchronous transmission, we send 1 start bit (0) at the beginning and 1 or more stop bits (1s) at the end of each byte. There may be a gap between bytes....
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2answers
654 views

Can I use SPI for asynchronous serial input? [closed]

I need a second serial async input channel on the MSP430G2553 and would like to use the SPI USCI to do this. Is the USCI SPI baud rate stable enough to do this at 300 baud, 2400 baud or 9600 baud? I ...
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2answers
639 views

Transmit data without microcontroller?

I am working on a remote-controlled (IR) lightswitch. This is pretty easy with an Arduino; you just do serial I/O with an IR receiver/transmitter to read "ON" and "OFF" signals. I want to know if ...
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1answer
264 views

Transmitting through IRDA as if its a native serial port. Possible?

I'm currently making a lazertag project that utilizes the standard UART data format for data I/O. Before I go make up another circuit board that connects a photo-transistor that senses a laser beam ...
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5answers
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Why we need start/stop bit for asynchronous transmission

I was reading a book which says Asynchronous transmission is so named because the timing of a signal is unimportant. Instead, information is received and translated by agreed upon patterns. To ...
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2answers
60 views

SIM800L rarely responds to commands

I'm trying to get a SIM800L module working with a USB-to-serial adapter using this circuit: simulate this circuit – Schematic created using CircuitLab (All of those resistors are 1000 ohm.) I ...
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2answers
75 views

Is there an industry standard serial hardware identification protocol?

Say I have several microcontrollers connected serially over several COM ports. I want to identify which microcontroller is on which port. Say, μC1 is on COM1 and μC2 is on COM2. Is there any industry-...
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1answer
46 views

Strange problem with Teensy 4.0 connected to external power only running code when serial connection is introduced

I am working on a project with an accelerometer and some LEDs, and I have encountered a strange problem getting everything to function while powered via battery. When I plug in the battery, the code ...
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2answers
208 views

Hardware/software needed to decode Differential Manchester?

I have a differential manchester encoded 0 to 5v data stream at 62500bps. What hardware do I need to get this into something I can work with, ie arduino, pi, etc? I have searched for chips/eval ...
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1answer
74 views

Serial Communication between two Arduino not working

I'm trying to perform a simple communication sending two strings in two char arrays from an Arduino Uno to another one. My problem is that after the 5th or 6th iteration the two strings will mix. ...
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2answers
36 views

RS232 RFID reader not working

I have purchased an RFID reader that communicates using an RS-232 cable. I have however used an RS-232 to USB adapter to connect it to my laptop. It is an ACM812A RFID reader. When I open the RFID ...
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1answer
145 views

RS232 Modbus to USB wiring

I have a RS232 device that sends data following the modbus protocol. I have problems communicating with it and I think my wiring is wrong. Since most modbus devices work over RS485 it is hard to find ...
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1answer
394 views

PIC32MX UART Interrupt Not working

I am writing a program to send data from one microcontroller and receive the data using on another PIC32 microcontroller and display the received data on LCD. I am using UART2 of both PIC32MX to send ...
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2answers
84 views

How to do serial communication between 3.3V and 5V devices using THT components?

I know that there are many questions dealing with logic level conversion/shifting between 3.3V and 5V devices, but my goal is to do do this with standard breadboard parts, so either discrete parts or ...
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1answer
45 views

Connecting a USB to UART converter to a computer's serial DB9 port

I have an APU2 that diverts any 'display' over a serial console (DB9F). For accessing the serial console, a null modem cable is recommended where the wires are crossed over. However, my computer does ...
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2answers
73 views

Sensor data transmission without using a microcontroller?

What is the most traditional approach to getting sensor data onto a radio from an embedded device pcb that doesn’t utilize a microcontroller? Up until now, we’ve been utilizing a convenient firmware ...

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