Sniffer/Monitor mode

With this mode you can monitor data exchange between any external devices, connected to the com port and Windows applications.

Terminal mode

Using the com port terminal mode, you can send and receive any data from the COM port to debug and diagnose your external devices.

HEX and ASCII

Serial Port Monitor can display incoming and outgoing data in HEX, ASCII or binary formats.

Our Advantages

Our software can work with any COM or RS232 ports (real COM ports, virtual COM ports, USB-to-Serial, TCP-to-Serial, Bluetooth COM ports).
Our serial port monitor supports the miscellaneous baud rates (up to 921600), user-defined baud rates, number of data bits, number of stop bits, different parity types, hardware or software flow control modes and other. You can change all communication parameters at any time.
We have developed software for COM ports since 1999.

Download and Test Our Software For Free!

We would offer a download for you to try. The trial version allows you to test all features of our software. The setup is quick and easy, and you will have the first results within minutes.

Download and Try Now!

"It's a good program... It's work! I will buy the full version!"

Michel Julien

"Your software works perfectly with our application and I look forward to doing business with you."

Edward

"Based on what I could ascertain, the problem was brilliantly solved. Please accept my congratulations."

Paolo Lepora

Why Our Customers Love Us

What you get with the free trial, before you pay anything.

Customer Support

Live chat during working hours and email support for questions and technical issues.

Any COM Port

Enjoy hassle-free connections with a wide range of COM ports and devices-real, virtual, USB-to-Serial, TCP-to-Serial, and Bluetooth.

Developed Since 1999

Developed and supported since 1999. Every update is listed in the version history.

Ready in Minutes

Pick the port from a list with device names, set the speed, click Open.

High Baud Rates

Standard baud rates up to 921,600 and user-defined rates. All port settings can be changed while the port is open.

Three Modes in One Window

Terminal to send by hand, Spy to watch another program's traffic, Automatic to send a file on a timer.

Com Port Debug Software

Our COM port debugging software allows you to debug data transferred via a COM port and test external devices connected to it.