FREE Serial Protocol Analyzer: Windows Com Port Monitor & Packet Data Sniffer - The first knowledge sharing application in Vietnam

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Free Serial Analyzer Overview

Free Serial Analyzer is a non-intrusive Serial Port sniffer and software RS-232/RS-422/RS-485 protocol analyzer for Windows.

It supports monitoring of serial port data on both 32-bit / 64-bit Windows desktop/server platforms including Windows 10. Windows 11 and Windows Server 2022 are also supported.

Our software-based free serial port monitor is an ideal alternative to expensive hardware RS232/RS485/RS422 logic analyzers. This COM port analyzer utility requires no additional cabling and allows you to effectively capture/display any data and commands transmitted through your computer’s serial ports.

The captured raw data is automatically decoded, analyzed and each serial communication packet is then presented in an easily readable format, allowing you to quickly and efficiently analyze data exchanged over RS 232, RS 422, or RS 485 serial interfaces.

For the best user experience, our product supports advanced data filtering. All intercepted serial data can be filtered by Requests, I/O Codes and even by custom filtering rules.

You can consider this serial port packet sniffer an effective tool to simplify development, testing and debugging of serial applications and devices.

Using our free serial protocol analyzer you don’t have to worry about any additional hardware, null-modem cables, DB-25 or DE-9 connectors and so on. It’s a pure software-based serial port sniffing solution. Just download, install and start using it in seconds!

How Free Serial Analyzer Works

Program installs filter driver on top of a serial device driver. Filter driver then intercepts I/O requests issued by an application communicating with a serial device. All control requests (requests that configure port parameters) and data transfer requests (requests that pass data between app and RS-232/RS-422/RS-485 hardware device) are monitored. Each serial data request is then parsed and displayed in an easy-to-understand form using several different views.

This freeware serial snooper even allows you to trace serial data transferred between applications and devices connected to the remote PC (Device Monitoring Studio Server, network or Internet connection to the remote computer is required then).

Download this free com port monitoring software now!

Free Serial Analyzer OS support:

Our Free Serial Port Snooper supports all modern Windows server and desktop platforms starting from Windows Vista, including Windows 11 and Windows 10 operating systems. Both x86 and x64 versions are supported.

Features

Free Serial Analyzer Features

Our Freeware Serial Port Monitor allows you to capture and decode monitored packets in real time even at high and non-standard data transfer rates. It supports all standard Bit rates of 75, 110, 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600 and 115200 bit/s and non-standard rates as well.

It intercepts and traces all Input/Output Control Code Requests (IOCTLs) and I/O Request Packets (IRPs) from DTE (data terminal equipment) and DCE (data circuit-terminating equipment) devices
It displays the status of Serial (Modem) control lines: Transmitted Data TxD, Received Data RxD, Data Terminal Ready DTR, Carrier Detect DCD, Data Set Ready DSR, Ring Indicator RI, Request To Send RTS, Clear To Send CTS
It monitors data from plug and play (PnP) serial ports and I/O ports (COM Ports) interfaced by 16550 UART: COM1, COM2, COM3, COM4 … COMn; custom and virtual serial ports registered and visible in Windows device manager under standard Ports (COM & LPT) device class.
It may capture serial port traffic which flows via Com ports created by our Free Virtual Serial Ports.
It supports monitoring of exchanged serial data from external devices connected to the PC via USB to Serial converters.

This Free COM Port Analyzer supports all standard Data bits, Parity (odd, even, mark, space), Stop bits, XON/XOFF Software and Hardware Flow control.

Paid editions of this product may also be used as affordable rs485/rs232 MODBUS sniffer, ACSII/RTU protocol analyzer and serial data logger.

If you are looking for non-intrusive software-based serial port monitoring solution to view serial protocol packets, this Free Serial Port Analyser is exactly what you need. This COM port monitoring tool requires no additional hardware and allows you to facilitate serial application development, debug protocol errors, view and test device failures.

Usage Scenarios

Our Free Serial Port Monitor Usage Scenarios

You can use this communication viewer and debugger to analyze serial protocols. This will come in handy for:

Serial protocol development, system integration and diagnostics
Detecting errors in asynchronous data transmission
Analyzing of data transferred between any RS232/422/485 device and Windows application
Development of RS232, RS485 and RS422 peripheral devices and device drivers
Debugging any serial port software or hardware, snooping serial data and control requests
Researching functionality of any third-party hardware devices and software applications
Debugging and testing different MODBUS devices
Testing and troubleshooting serial protocols between device and device driver
Analyzing and reverse-engineering RS-232/RS-422/RS-485 serial protocols

Target Groups

Free Software Serial Port Logic Analyzer Target Groups

Our free serial data parser, decoder and analyser is an extremely useful tool for the following target groups:

Serial port device drivers and software application developers
RS232/422/485 hardware developers, manufacturers and vendors
System integrators and consultants
Field and lab engineers
Programmers, testers and other IT specialists
SCADA software system engineers
Industrial control equipment support specialists
Science technicians and university students

Supported Serial Devices

Free Serial Protocol Analyzer allows you to capture communication data flowing between computer and the following serial devices:

Dial-up Modems, Fax-Modems, mini-ATS, Computer terminals, teletypes
POS terminals, shop till systems, Bar code scanners and other point of sale devices
Industrial automation systems, RS232/485/422 industrial equipment
Network equipment, Wireless LAN equipment, Serial device servers, NPort servers
Console ports, Routers, Multiplexers, Hubs, Switches, firewalls, load balancers
RS-232 to RS-422/485 converters, Multiport Serial Boards, Serial to fiber converters
Printers, test instruments, scientific instruments, relays, lamps, Telescopes
Test and measuring equipment, multimeters, oscilloscopes, manometers, sensors
Network-enable serial devices, Serial device controllers, uninterruptible power supply
Low-speed satellite modems, satellite phones, GPS receivers, other satellite based transceiver devices
PLCs, VFDs, servo drives, CNC controllers, other CNC equipment programmable via RS232/422/485
Entertaining equipment, simulators, MIDI-serial devices
HVAC, door entry systems, other security systems
Bar-code readers, Cash registers, Card readers
Diagnostic equipment, software debuggers that run on a second computer

Our free com port snooper supports monitoring of legacy and PnP serial ports, serial to usb converters, serial adapters and software-based Virtual Serial Ports.

Supported Serial Requests

Our serial snooper supports spying serial port for the I/O and Control Requests.

Supported Serial I/O Requests: