I whipped up this little utility a while back as a quick and easy way to get screen captures from the TDS3000 series’s serial port.
There is now a new version of this tool which includes GPIB support. For RS-232 it can read the image a few seconds faster than the previous version. NI-VISA installation and supported hardware is required if using GPIB. It’ll still work for RS-232 only without NI-VISA.
Choice of serial cable
Note that if you are building your own Null-Modem serial cable to connect to the scope, please connect all signals as per standard Null Modem cable wiring. This program requires hardware flow control. It is not sufficient to connect only the RX and TX lines.