JSM Comcap is a utility tool used to capture, analyse, edit and simulate serial ports (COM). JSM Micro offers it free but requires a quick and simple registration.
Serial port (COM) capture, analysis, editing and playback tool. The main characteristics are :
ability to capture from one or two simultaneous serial ports using various port settings;
record precisely and accurately every byte transmitted through the serial port;
ability to playback from one or two simultaneous serial ports and respecting timestamps;
view bytes in hexadecimal and character (ASCII) formats as well as timestamps;
view one or multiple bytes per line depending on the needed precision;
define custom search patterns to be highlited in different colors for a better analysis;
jump to the next or previous search match;
copy/pasting data between different capture files, to the clipboard or to a file;
export captured data to multiple formats;
ability to modify or edit captured data and timestamps;
ability to select, insert, transform and remove bytes from the capture file;
can handle serial port errors;
simple keyboard shortcuts for all commands;
video tutorials for all program features.
Important : Framework .Net 2.0 (not included with JSM Comcap) needs to be installed prior JSM Comcap installation. It can be automatically installed via
Choose the software version you want to download. For a smaller package, you can download the software without the video tutorials and view them online instead. The larger package includes the video tutorials.