Cause: Another program (Arduino IDE, CuteCom, or even a zombie process) is holding the port. Solution:
The original native release of SSCOM has a Chinese interface. However, version 5.13.1 is widely distributed by the electronics community with translated English labels. When downloading, look for files labeled "SSCOM 5.13.1 English" or check community forums like EDA boards or GitHub repositories.
Note: As with any small utility downloaded from the internet, it is best practice to scan the file with an antivirus tool before running it.
Sscom is a serial port (RS-232) terminal and debugger. Think of it as a Swiss Army knife for anything that communicates over UART, RS-485, or a virtual COM port. Whether you're flashing firmware onto an Arduino, reverse-engineering a mysterious device, or debugging an old industrial PLC, Sscom bridges the gap between your PC and the embedded world. Sscom 5.13.1 English
Version 5.13.1 (English) is particularly special. It represents a mature, bug-fixed release of the original Chinese tool, with all menus and dialogs properly localized. No bloat. No installer nonsense. Just a single .exe file that runs on anything from Windows XP to Windows 11.
In version 5.13.1, there is a background "Chart" function. If you receive comma-separated integers (e.g., 23,45,67), Sscom can render a live oscilloscope-style line graph. This is invaluable for PID tuning or temperature sensor debugging.
You can define a library of "Quick Sends." For example: Cause: Another program (Arduino IDE, CuteCom, or even
These macros support loop counts and delays (ms) for automated testing.
Because Putty is a jack of all trades (SSH, Telnet, Rlogin, and serial) but master of none. Tera Term is powerful but slow to launch and overkill for 90% of tasks.
Sscom is the vim of serial terminals — cryptic at first, but once you learn the keyboard shortcuts (F1 to F5 for quick sends, Ctrl+Shift+L to start logging), you'll never go back. It also handles DTR/RTS toggling explicitly, a must for resetting ESP32 or STM32 bootloaders. You can define a library of "Quick Sends
Sscom (also written as SSCOM) is a lightweight, powerful serial port communication tool for Windows. Originally developed by Dingxin, version 5.13.1 is one of the most stable releases. It allows you to:
Unlike oversized IDEs or clunky terminal emulators, Sscom focuses on speed and simplicity.