Key Details of CoolTerm

  • Monitor, troubleshoot, debug, or test serial port connections and performance
  • Last updated on 10/23/20
  • There have been 2 updates within the past 6 months
  • The current version has 0 flags on VirusTotal badge_icon
  • Also available on Mac

Developer's Description

CoolTerm is a simple serial port terminal application (no terminal emulation) that is geared towards hobbyists and professionals with a need to exchange data with hardware connected to serial ports such as servo controllers, robotic kits, GPS receivers, microcontrollers.

Full Specifications

What's new in version 1.8

  • Replaced "Relative Time" timestamp format with "Time + Millis". It is now possible to record current time stamps with millisecond resolution, and the relative timestamp format is no longer necessary.
  • Renamed the "Absolute Date and Time" and "Absolute" timestamp formats to "Date and Time" and "Time", respectively.
  • Added code to improve accuracy for millisecond resolution timestamps.
  • Added option to add timestamps to received data displayed in the CoolTerm window. The timestamps are added to the actual data, i.e. they will also be present in hex view.
  • Added Preferences setting for smart display pausing. If enabled, scrolling up automatically pauses the display. Scrolling to the bottom automatically unpauses the display.
  • "PauseDisplay" is no longer a Connection Settings parameter.
  • Added "PauseDisplay(ID as integer, Value as boolean)" script command.
  • Added keyboard shortcuts to toggle RTS and DTR handshake lines.
  • Added "Remote" menu that is visible when the Remote Control Socket is enabled via the preferences. The menu item indicates if the socket is connected or not. The "Disconnect" menu item can be used to close and active connection.
  • Added context menu item to connection status label for an easy way to reveal the capture file.
  • Added button to "Save as Default" message dialog to open the default file location.
  • Added SPACE and MARK parity options.
  • Added "GetFrontmostWindow as integer" script command.
  • Improved mouse wheel scroll performance.
  • Added better error handling when the remote control socket port or HTTP server port are already in use by another app.
  • Updated code for line mode history so that its behavior is consistent with UNIX style consoles.
  • Updated code to use use Serial Port API 2.0.


Release October 23, 2020
Date Added October 23, 2020
Version 1.8

Operating Systems

Operating Systems Windows, Windows 7, Windows 8, Windows 10
Additional Requirements None


Total Downloads 49,988
Downloads Last Week 66
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