: Save all communication sessions to a text file with precise timestamps to preserve data for later analysis.
You can configure the tool to transmit a specific command string periodically at an exact millisecond interval (e.g., querying sensor registers every 500ms).
Users can send and receive data in both ASCII and Hexadecimal formats, which is essential for diagnosing low-level firmware protocols.
Plug your USB-to-TTL adapter (e.g., CH340, CP2102, or FTDI) into your PC.
Instead of copying and pasting repeating setup strings, the "Extension" panel lets you map dozens of predefined strings or Hex payloads to quick-action side buttons. This is highly useful when cycling through sequence-dependent AT commands during cellular or Wi-Fi modem configurations. 2. Auto-Looping & File Transfers
(specifically the executable sscom5131.exe ) is widely regarded in the engineering community as a high-quality, lightweight utility for serial port communication and debugging . Developed by Hitachi Information Systems, Ltd. (now part of Hitachi Systems), it is a staple for developers working with embedded systems like Arduino, STM32, and ESP8266. Key Features & Performance
The entire application consists of a (approximately 410KB). This is a "green" portable version that requires no installation or system modification. You can literally copy it onto a USB drive and use it on any Windows computer—from Windows XP through Windows 11. This lightweight nature also means it starts instantly, doesn't consume unnecessary system resources, and never interferes with other applications.
: Supports both ASCII and HEX display/sending. It can also save communication logs directly to text files for future reference.
The tool also features a (Simplified Chinese and English), switchable via INI configuration files or registry key values without requiring a restart. Chinese fonts use UTF-8 encoding rendering, permanently eliminating display misalignment or garbled text caused by GBK/ANSI encoding.
: Features a "Multi-Char" window for sending sequences of commands and built-in Modbus CRC16 checksum calculation for industrial device testing. Usage Tips
While modern alternatives like HTerm or Putty exist, few match the raw efficiency of SSCOM5131. If you prioritize stability and speed over fancy graphs, this tool is a high-quality gem.
Sending or receiving text and script files directly over log files to test bootloaders. Best Practices for Safe Acquisition and Deployment
: Pre-program multiple command strings to execute complex testing sequences. 3. Execution and Logging Stability