maybe this?
With Virtual Port Monitor, you can capture printer output that would normally go to a communications port such as LPT1. Useful for second stage processing such as creating PDF files, ripping, or simple distribution of printer output.
or this
[link|http://www.alphatronics.net/ASPMonitor.html|Serial Port Monitor]
With Serial Port Monitor, you can capture binary data from the computers serial port, and with the use of a serial to parallel converter, you can capture the data from the printer port of another device. It is useful in capturing data from devices that do not have the ability to "print to file".
