CoderTools

Online Serial Port Debugger

Browser-based serial debugging tool - no download required, real-time monitoring via Web Serial API

Connection

Status: Disconnected

Data Monitor

Send Data

Interval (ms):

Statistics

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Bytes Sent
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Bytes Received
00:00:00
Connection Time
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Data Rate (B/s)

Serial Port Debugger Documentation

What is Serial Port Communication?

Serial port communication is a method of data transmission where data is sent sequentially, one bit at a time, over a communication channel. It's commonly used to connect computers with peripheral devices like microcontrollers, sensors, and embedded systems.

Serial communication is widely used in IoT devices, Arduino/ESP32 projects, debugging embedded systems, and industrial automation. It provides a simple, reliable way to exchange data between devices.

How to Use This Tool

  1. Connect your serial device to the computer
  2. Configure connection parameters (baud rate, data bits, parity, stop bits)
  3. Click "Connect" to establish serial connection
  4. Monitor received data in real-time
  5. Send data in text or HEX format
  6. Use send history to repeat previous commands
  7. View connection statistics and data rate

Connection Parameters

Baud Rate
Data transmission speed (bits per second)
Data Bits
Number of bits per data frame (5-8)
Parity
Error detection method (None, Even, Odd)
Stop Bits
Frame end indicators (1 or 2)

Technical Terminology Guide

Baud Rate

Baud rate is the speed of data transmission in serial communication, measured in symbols per second. It must be set to the same value on both communicating devices. Common baud rates are standardized to ensure compatibility across different systems.

Common values: 9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600

Reference: RS-232 Standard (ITU-T V.24)

Data Bits

Data bits specify the number of bits in each character, typically ranging from 5 to 8 bits. 8-bit data is most common as it can transmit standard ASCII characters (0-255). Fewer data bits are used for special protocols or legacy devices.

Common values: 7 bits (ASCII characters), 8 bits (extended ASCII and binary data)

Reference: ASCII Standard (ANSI X3.4-1986)

Parity

Parity is a simple error detection mechanism. Even parity ensures an even number of 1s in the data bits, while odd parity ensures an odd number. 'None' is commonly used in modern applications as more reliable error detection methods are available.

Types: None, Odd, Even, Mark, Space

Reference: RS-232 Error Detection Mechanism

Stop Bits

Stop bits mark the end of a data frame, typically 1 or 2 bits. 1 stop bit is the standard setting, while 2 stop bits are mainly used for legacy devices or special protocols. Stop bits give the receiver time to prepare for the next character.

Common values: 1 bit (standard), 2 bits (legacy devices or special protocols)

Reference: UART Communication Protocol Standard

Flow Control

Flow control manages data transmission speed to prevent the receiver from being overwhelmed by fast data transmission. Hardware flow control uses RTS/CTS signal lines, while software flow control uses XON/XOFF characters.

Types: None, Hardware (RTS/CTS), Software (XON/XOFF)

Reference: RS-232 Hardware Handshaking Protocol

Related Standards and Specifications

RS-232: RS-232: Classic serial communication standard defining electrical characteristics and connector specifications
UART: UART: Universal Asynchronous Receiver-Transmitter, the core protocol for serial communication
USB-to-Serial: USB-to-Serial: Common serial conversion method in modern devices

For more information: Wikipedia RS-232, UART Protocol Standards Documentation

Wikipedia: RS-232 Wikipedia: UART ITU-T V.24 Standard

Key Features

Web Serial API

Direct browser access to serial ports without additional software

Real-time Monitoring

Live data monitoring with timestamp and auto-scroll support

HEX Mode

Send and receive data in hexadecimal format with validation

Send History

Track and replay previously sent commands

Statistics

Monitor data transmission rates and connection time

Multi-language

Support for Chinese, English, Japanese, French, and Spanish

Common Use Cases

Development & Debugging

  • Arduino and ESP32 development
  • Embedded system debugging
  • Firmware development and testing
  • IoT device configuration

Testing & Communication

  • AT command testing for modems
  • Sensor data monitoring
  • Protocol analysis and debugging
  • Industrial device communication

Browser Support & Requirements

Supported Browsers

  • Chrome 89+
  • Edge 89+
  • Firefox (not supported)
  • Safari (not supported)

Requirements

  • Chromium-based browser with Web Serial API support
  • HTTPS connection (required for Web Serial API)
  • User permission to access serial ports
  • Compatible serial device drivers installed

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